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Sample records for n-substituted aryl compounds

  1. Hemoglobin adducts of N-substituted aryl compounds in exposure control and risk assessment.

    Science.gov (United States)

    Neumann, H G; Birner, G; Kowallik, P; Schütze, D; Zwirner-Baier, I

    1993-03-01

    Arylamines, nitroarenes, and azo dyes yield a common type of metabolite, the nitroarene, which produces a hydrolyzable adduct with protein and is closely related to the critical, ultimate toxic and genotoxic metabolite. The target dose as measured by hemoglobin adducts in erythrocytes reflects not only the actual uptake from the environment but also an individual's capacity for metabolic activation and is therefore an improved dosimeter for human exposure. The usefulness of hemoglobin adducts in molecular epidemiology is now widely recognized. With regard to risk assessment, many questions need to be answered. The described experiments in rats address some of these questions. The relationship between binding to hemoglobin in erythrocytes and to proteins in plasma has been found to vary considerably for a number of diamines. The fraction of hydrolyzable adducts out of the total protein adducts formed also varies in both compartments. This indicates that the kind of circulating metabolites and their availability in different compartments is compound specific. This has to do with the complex pattern of competing metabolic pathways, and the role of N-acetylation and deacetylation is emphasized. An example of nonlinear dose dependence adds to the complexity. Analysis of hemoglobin adducts reveals interesting insights into prevailing pathways, which not only apply to the chemical, but may also be useful to assess an individual's metabolic properties. In addition, it is demonstrated that the greater part of erythrocytes and benzidine-hemoglobin adducts are eliminated randomly in rats, i.e., following first-order kinetics.

  2. Synthesis and anxiolytic activity of N-substituted cyclic imides N-[4-[(4-aryl)-1-piperazinyl]alkyl]-5,7-dioxabicyclo[2.2.2]octane-2, 3-dicarboximide.

    Science.gov (United States)

    Zawadowski, T; Kossakowski, J; Rump, S; Jakowicz, I; Płaźnik, A

    1995-01-01

    The preparation of N-substituted cyclic imides N-[4-[(4-aryl)-1-piperazinyl]alkyl]-5,7-dioxabicyclo[2.2.2]octane- 2, 3-dicarboximides by condensation of N-(3-chloropropyl)- or N-(4-chlorobutyl)imides with appropriate amine has been described. One of compounds was tested in the Vogel's test and displayed an expected activity on CNS.

  3. Synthesis, antimicrobial, anticancer, antiviral evaluation and QSAR studies of 4-(1-aryl-2-oxo-1,2-dihydro-indol-3-ylideneamino-N-substituted benzene sulfonamides

    Directory of Open Access Journals (Sweden)

    Mahesh Kumar

    2014-09-01

    Full Text Available A series of 4-(1-aryl-2-oxo-1,2-dihydro-indol-3-ylideneamino-N-substituted benzenesulfonamide derivatives (1–32 was synthesized and evaluated for its in vitro antimicrobial, antiviral and cytotoxic activities. Antimicrobial results indicated that compounds (11 and (18 were found to be the most effective ones. In general, the synthesized compounds were bacteriostatic and fungistatic in their action. The cytotoxic screening results indicated that the compounds were less active than the standard drug 5-fluorouracil (5-FU. None of the compounds inhibited viral replication at subtoxic concentrations. In general, the presence of a pyrimidine ring with electron releasing groups and an ortho- and para-substituted benzoyl moiety favored antimicrobial activities. The results of QSAR studies demonstrated the importance of topological parameters, valence zero order molecular connectivity index (0χv and valence first order molecular connectivity index (1χv in describing the antimicrobial activity of synthesized compounds.

  4. Palladium-Catalyzed Carbonylation of Aryl Bromides with N-Substituted Cyanamides

    DEFF Research Database (Denmark)

    Lian, Zhong; Friis, Stig D.; Lindhardt, Anders T.;

    2014-01-01

    The palladium(0)-catalyzed three-component coupling reaction of aryl bromides, carbon monoxide, and N-alkyl cyan­amides has been developed employing a two-chamber system with ex situ generation of carbon monoxide from a silacarboxylic acid. The reactions proceeded well and were complete with a re...

  5. Synthesis and monoamine oxidase inhibitory activities of some 3-(4-fluorophenyl)-5-aryl-n-substituted-4,5-dihydro-(1H)-pyrazole-1-carbothioamide derivatives.

    Science.gov (United States)

    Koç, G Ş; Tan, O U; Uçar, G; Yildirim, E; Erol, K; Palaska, E

    2014-11-01

    28 new 3-(4-fluorophenyl)-5-aryl-N-substituted-4,5-dihydro-1H-pyrazole-1-carbothioamide derivatives were synthesized and evaluated in vitro for their monoamine oxidase (MAO) A and B inhibitory activity and selectivity. The derivatives substituted by halogen on the fifth position of pyrazole ring, inhibited MAO-A enzyme with a high selectivity index. On the other hand, compounds substituted with 2-naphthyl inhibited MAO-B enzyme with a moderate selectivity index. Docking studies were done to highlight the interactions of the most active derivative with the active site of MAO-A. In addition, in vivo antidepressant and anxiolytic activities of the compounds having selective MAO-A inhibitory effects, were investigated by using Porsolt forced swimming and elevated plus-maze tests respectively. 3-(4-Fluorophenyl)-5-(4-chloro-phenyl)-N-allyl-4,5-dihydro-1H-pyrazole-1-carbothio-amide has antidepressant, 3-(4-fluorophenyl)-5-(4-chlorophenyl)-N-methyl-4,5-dihydro-1H-pyrazole-1-carbothioamide and 3-(4-fluoro-phenyl)-5-(4-bromophenyl)-N-ethyl-4,5-dihydro-1H-pyrazole-1-carbothioamide have anxiolytic activity.

  6. Studies in Sulphonamides Part XIII: Synthesis of Some new 1-methyl-3-aryl-2-(arylazo/N-substituted p-sulphamylbenzeneazo propane-1, 3-diones as potential antibacterials

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    H. C. Nigam

    1982-04-01

    Full Text Available Two 1-methyl-3-arylpropane-1,3-diones viz., 1-methyl-3(2',4'-dimethoxyphenyl-and l-methlyl-3(3',4'-dimethoxyphenyl propane-1,3-diones have been synthesised and coupled with diazotised simple and sulphonamide bases in presence of sodium acetate to furnish the corresponding 1-methyl-3(2',4'-3',4'-dimethoxyphenyl-2 (arylazo/N-substituted p-sulphamylbenzeneazopropane-1,3-diones. All these compounds were later subjected to in vitro screening against S. aureus, E. coli and p.pyocyanea when these showed considerable activity.

  7. In vitro function of the aryl hydrocarbon receptor predicts in vivo sensitivity of oviparous vertebrates to dioxin-like compounds

    Science.gov (United States)

    Differences in sensitivity to dioxin-like compounds (DLCs) among species and taxa presents a major challenge to ecological risk assessments. Activation of the aryl hydrocarbon receptor (AHR) regulates adverse effects associated with exposure to DLCs in vertebrates. Prior investig...

  8. Aryl Pyrazoles as Potent Inhibitors of Arginine Methyltransferases: Identification of the First PRMT6 Tool Compound.

    Science.gov (United States)

    Mitchell, Lorna H; Drew, Allison E; Ribich, Scott A; Rioux, Nathalie; Swinger, Kerren K; Jacques, Suzanne L; Lingaraj, Trupti; Boriack-Sjodin, P Ann; Waters, Nigel J; Wigle, Tim J; Moradei, Oscar; Jin, Lei; Riera, Tom; Porter-Scott, Margaret; Moyer, Mikel P; Smith, Jesse J; Chesworth, Richard; Copeland, Robert A

    2015-06-11

    A novel aryl pyrazole series of arginine methyltransferase inhibitors has been identified. Synthesis of analogues within this series yielded the first potent, selective, small molecule PRMT6 inhibitor tool compound, EPZ020411. PRMT6 overexpression has been reported in several cancer types suggesting that inhibition of PRMT6 activity may have therapeutic utility. Identification of EPZ020411 provides the field with the first small molecule tool compound for target validation studies. EPZ020411 shows good bioavailability following subcutaneous dosing in rats making it a suitable tool for in vivo studies.

  9. Palladium- and copper-mediated N-aryl bond formation reactions for the synthesis of biological active compounds

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    Burkhard Koenig

    2011-01-01

    Full Text Available N-Arylated aliphatic and aromatic amines are important substituents in many biologically active compounds. In the last few years, transition-metal-mediated N-aryl bond formation has become a standard procedure for the introduction of amines into aromatic systems. While N-arylation of simple aromatic halides by simple amines works with many of the described methods in high yield, the reactions may require detailed optimization if applied to the synthesis of complex molecules with additional functional groups, such as natural products or drugs. We discuss and compare in this review the three main N-arylation methods in their application to the synthesis of biologically active compounds: Palladium-catalysed Buchwald–Hartwig-type reactions, copper-mediated Ullmann-type and Chan–Lam-type N-arylation reactions. The discussed examples show that palladium-catalysed reactions are favoured for large-scale applications and tolerate sterically demanding substituents on the coupling partners better than Chan–Lam reactions. Chan–Lam N-arylations are particularly mild and do not require additional ligands, which facilitates the work-up. However, reaction times can be very long. Ullmann- and Buchwald–Hartwig-type methods have been used in intramolecular reactions, giving access to complex ring structures. All three N-arylation methods have specific advantages and disadvantages that should be considered when selecting the reaction conditions for a desired C–N bond formation in the course of a total synthesis or drug synthesis.

  10. Palladium catalyzed C3-arylation of 4-hydroxy-2-pyridones.

    Science.gov (United States)

    Anagnostaki, Elissavet E; Fotiadou, Anna D; Demertzidou, Vera; Zografos, Alexandros L

    2014-07-01

    The direct arylation of N-substituted-4-hydroxy-2-pyridones with aryl boronic acids has been achieved under palladium catalysis. The mild reaction conditions applied in this method and the use of a conventional catalytic system offer an attractive protocol for the efficient synthesis of a variety of 3-arylated products.

  11. Conformational restriction of aryl thiosemicarbazones produces potent and selective anti-Trypanosoma cruzi compounds which induce apoptotic parasite death.

    Science.gov (United States)

    Magalhaes Moreira, Diogo Rodrigo; de Oliveira, Ana Daura Travassos; Teixeira de Moraes Gomes, Paulo André; de Simone, Carlos Alberto; Villela, Filipe Silva; Ferreira, Rafaela Salgado; da Silva, Aline Caroline; dos Santos, Thiago André Ramos; Brelaz de Castro, Maria Carolina Accioly; Pereira, Valéria Rego Alves; Leite, Ana Cristina Lima

    2014-03-21

    Chagas disease, caused by Trypanosoma cruzi, is a life-threatening infection leading to approximately 12,000 deaths per year. T. cruzi is susceptible to thiosemicarbazones, making this class of compounds appealing for drug development. Previously, the homologation of aryl thiosemicarbazones resulted in an increase in anti-T. cruzi activity in comparison to aryl thiosemicarbazones without a spacer group. Here, we report the structural planning, synthesis and anti-T. cruzi evaluation of new aryl thiosemicarbazones (9a-x), designed as more conformationally restricted compounds. By varying substituents attached to the phenyl ring, substituents were observed to retain, enhance or greatly increase the anti-T. cruzi activity, in comparison to the nonsubstituted derivative. In most cases, hydrophobic and bulky substituents, such as bromo, biphenyl and phenoxyl groups, greatly increased antiparasitic activity. Specifically, thiosemicarbazones were identified that inhibit the epimastigote proliferation and were toxic for trypomastigotes without affecting mouse splenocytes viability. The most potent anti-T. cruzi thiosemicarbazones were evaluated against cruzain. However, inhibition of this enzyme was not observed, suggesting that the compounds work through another mechanism. In addition, examination of T. cruzi cell death showed that these thiosemicarbazones induce apoptosis. In conclusion, the structural design executed within the series of aryl thiosemicarbazones (9a-x) led to the identification of new potent anti-T. cruzi agents, such as compounds (9h) and (9r), which greatly inhibited epimastigote proliferation, and demonstrated a toxicity for trypomastigotes, but not for splenocytes. Mechanistically, these compounds do not inhibit the cruzain, but induce T. cruzi cell death by an apoptotic process.

  12. Synthesis and evaluation of 6-pyrazoylamido-3N-substituted azabicyclo[3,1,0]hexane derivatives as T-type calcium channel inhibitors for treatment of neuropathic pain.

    Science.gov (United States)

    Kim, Jung Hyun; Nam, Ghilsoo

    2016-11-01

    A new series of aryls, including benzo[d]imidazole/isoxazole/pyrazole, conjugated to 3N-substituted-azabicyclo[3.1.0]hexane derivatives were designed and synthesized as inhibitors of T-type calcium channels. Among the synthesized compounds, 3N-R-substituted azabicyclo[3.1.0]hexane carboxamide derivatives containing 5-isobutyl-1-phenyl-pyrazole ring exhibited potent and selective T-channel inhibition and good metabolic stability without CYP450 inhibition. Compounds 10d and 10e contained hydrophobic substituents at the 3N-position and exhibited potent in vitro efficacy, as well as neuropathic pain alleviation in rats.

  13. Amine-synthesizing enzyme N-substituted formamide deformylase: Screening, purification, characterization, and gene cloning

    OpenAIRE

    Fukatsu, Hiroshi; Hashimoto, Yoshiteru; Goda, Masahiko; Higashibata, Hiroki; Kobayashi, Michihiko

    2004-01-01

    N-substituted formamide was produced through the hydration of an isonitrile by isonitrile hydratase in the isonitrile metabolism. The former compound was further degraded by a microorganism, strain F164, which was isolated from soil through an acclimatization culture. The N-substituted formamide-degrading microorganism was identified as Arthrobacter pascens. The microbial degradation was found to proceed through an enzymatic reaction, the N-substituted formamide being hydrolyzed to yield the ...

  14. Biotransformation and Biodegradation of N-Substituted Aromatics in Methanogenic Granular Sludge.

    NARCIS (Netherlands)

    Razo Flores, E.

    1997-01-01

    N-substituted aromatic compounds are environmental contaminants associated with the production and use of dyes, explosives, pesticides and pharmaceuticals among others. Nitro- and azo-substituted aromatic compounds with strong electron withdrawing groups are poorly biodegradable in aerobic treatment

  15. Synthesis and Antibacterial Activity Study of N-Substituted Acetamide Derivatives of 4-Hydroxy-2-oxo-2H-Chromene

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    *Aziz-ur-Rehman

    2015-06-01

    Full Text Available The heterocyclic coumarin derivatives are well known for their biological potential. The presented work demonstrates the evaluation of some N-substituted acetamoyl derivatives of 4-hydroxy-2-oxo-2H-chromene (4 against certain strains of gram bacteria. First, N¬-substituted-2-bromoacetamide, 3a-r, were synthesized by the reaction of aralkyl/aryl amines, 1a-r, with 2-bromoacetyl bromide (2 in an aqueous medium under definite pH control. In the second step, the resulted electrophiles, 3a-r, were made to react 4 in a polar aprotic solvent using a weak base as an activator to synthesize the final N-substituted-2-[(2-oxo-2H-chromen-4-yloxy]acetamide, 5a-r. The synthesis of compounds, 5a-r, was corroborated by TLC initially and spectral data of IR, 1H-NMR and EIMS finally. The MIC results of antibacterial activity rendered these molecules valuable inhibitors of all the bacterial strains taken into account.

  16. Tandem SN2' nucleophilic substitution/oxidative radical cyclization of aryl substituted allylic alcohols with 1,3-dicarbonyl compounds.

    Science.gov (United States)

    Zhang, Zhen; Li, Cheng; Wang, Shao-Hua; Zhang, Fu-Min; Han, Xue; Tu, Yong-Qiang; Zhang, Xiao-Ming

    2017-03-23

    A novel and efficient tandem SN2' nucleophilic substitution/oxidative radical cyclization reaction of aryl substituted allylic alcohols with 1,3-dicarbonyl compounds has been developed by using Mn(OAc)3 as an oxidant, which enables the expeditious synthesis of polysubstituted dihydrofuran (DHF) derivatives in moderate to high yields. The use of weakly acidic hexafluoroisopropanol (HFIP) as the solvent rather than AcOH has successfully improved the yields and expanded the substrate scope of this type of radical cyclization reactions. Mechanistic studies confirmed the cascade reaction process involving a final radical cyclization.

  17. Studies in Heterocyclic Compounds-Part XXXIII : Synthesis and in vitro screening of some 1,3-diaryl-5-(arylazo/N-substituted p-sulphamylbenzeneazo dihydro-2-thioxo-4,6 (1H, 5H-pyrimidinedioes

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    S. C. Nigam

    1981-01-01

    Full Text Available 1-Phenyl-3-(p-methoxyphenyl- and 1,3-di(p-methoxyphenyl dihydro-2-thioxo-4,6 (1H, 5H-pyrimidinediones have been synthesised and coupled with different diazotised simple and sulphonamide bases to furnish the corresponding 5-(arylazo/N- substituted p-sulphamylbenezeneazodihydro-2-thioxo-4, 6(1H, 5H-pyrimidinediones. On in vitro screening these were found to exhibit considerable activity against a number of micro-organisms.

  18. Evaluation of the Toxicity of 5-Aryl-2-Aminoimidazole-Based Biofilm Inhibitors against Eukaryotic Cell Lines, Bone Cells and the Nematode Caenorhabditis elegans

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    Hans Steenackers

    2014-10-01

    Full Text Available Previously, we have synthesized several series of compounds based on the 5-aryl-2-aminoimidazole scaffold, which showed a preventive activity against microbial biofilms. We here studied the cytotoxicity of the most active compounds of each series. First, the cytostatic activity was investigated against a number of tumor cell lines (L1210, CEM and HeLa. A subset of monosubstituted 5-aryl-2-aminoimidazoles showed a moderate safety window, with therapeutic indices (TIs ranging between 3 and 20. Whereas introduction of a (cyclo-alkyl chain at the N1-position strongly reduced the TI, introduction of a (cyclo-alkyl chain or a triazole moiety at the 2N-position increased the TI up to 370. Since a promising application of preventive anti-biofilm agents is their use in anti-biofilm coatings for orthopedic implants, their effects on cell viability and functional behavior of human osteoblasts and bone marrow derived mesenchymal stem cells were tested. The 2N-substituted 5-aryl-2-aminoimidazoles consistently showed the lowest toxicity and allowed survival of the bone cells for up to 4 weeks. Moreover they did not negatively affect the osteogenic differentiation potential of the bone cells. Finally, we examined the effect of the compounds on the survival of Caenorhabditis elegans, which confirmed the higher safety window of 2N-substituted 5-aryl-2-aminoimidazoles.

  19. Magnesium-induced copper-catalyzed synthesis of unsymmetrical diaryl chalcogenide compounds from aryl iodide via cleavage of the Se-Se or S-S bond.

    Science.gov (United States)

    Taniguchi, Nobukazu; Onami, Tetsuo

    2004-02-06

    The methodology for a copper-catalyzed preparation of diaryl chalcogenide compounds from aryl iodides and diphenyl dichalcogenide molecules is reported. Unsymmetrical diaryl sulfide or diaryl selenide can be synthesized from aryl iodide and PhYYPh (Y = S, Se) with a copper catalyst (CuI or Cu(2)O) and magnesium metal in one pot. This reaction can be carried out under neutral conditions according to an addition of magnesium metal as the reductive reagent. Furthermore, it is efficiently available for two monophenylchalcogenide groups generated from diphenyl dichalcogenide.

  20. Facile Synthesis of N -Substituted Benzimidazoles

    NARCIS (Netherlands)

    Kurhade, Santosh; Rossetti, Arianna; Dömling, Alexander

    2016-01-01

    A particularly mild and efficient one-pot synthesis of N-substituted benzimidazole derivatives was developed. 2-Fluoro-5-nitrophenylisocyanide reacts with a diverse set of primary amines to afford the respective products in moderate to very good yield (35-95%; 20 examples).

  1. Indium(III)-catalyzed synthesis of N-substituted pyrroles under solvent-free conditions

    OpenAIRE

    Chen,Jiu-Xi; Liu,Miao-Chang; Yang, Xiao-Liang; Ding,Jin-Chang; Wu,Hua-Yue

    2008-01-01

    A variety of N-substituted pyrroles have been synthesized by reacting γ-diketones (R¹C(O)CH2CH2C(O)R²: R¹, R² = Me, Ph) with amines (RNH2: R=Alkyl, Aryl, TsNH) or diamines (1,6-diaminohexane and 1,2-diaminoethane) in the presence of indium tribromide, indium trichloride or indium trifluoromethanesulfonate at room temperature under solvent-free conditions. The experiment protocol features simple operations, and the products are isolated in high to excellent yields (81-98%).

  2. Novel Fluorinated Phosphorus–Sulfur Heteroatom Compounds: Synthesis and Characterization of Ferrocenyl- and Aryl-Phosphonofluorodithioic Salts, Adducts, and Esters

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    Guoxiong Hua

    2015-07-01

    Full Text Available A series of novel ferrocenyl- and aryl-phosphonofluorodithioic salts, adducts, and esters has been prepared. The reaction of 2,4-diferrocenyl-1,3,2,4-diathiadiphosphetane 2,4-disulfide {[FcP(μ-SS]2, FcLR} with dry KF or tetrabutylammonium fluoride (TBAF led to the corresponding potassium and tetrabutylammonium salts of ferrocenyldithiofluorophosphinic acids. Treating potassium ferrocenyldithiofluorophosphinic acid with an equimolar amount of tetraphenylphosphonium chloride readily yielded the corresponding organic adducts, and with mono- and di-halogenated alkanes generated a series of the corresponding esters of ferrocenylphosphonofluoridodithioates. Similarly, using 1,3-epithionaphtho[1,8-cd][1,2,6] oxadiphosphinine 1,3-disulfide or Belleau’s Reagent in place of FcLR resulted in the corresponding novel salts, adducts, and ester derivatives. All new compounds have been characterized by means of multi-NMR (1H, 13C, 31P, 19F spectroscopy and accurate mass measurement in conjunction with single crystal X-ray crystallography of four structures.

  3. Novel Synthesis of N-Substituted p-Hydroxybenzoic Amides on Soluble Polymer-Support

    Institute of Scientific and Technical Information of China (English)

    胡春玲; 陈祖兴; 杨桂春

    2003-01-01

    The synthesis of N-substituted p-hydroxybenzoic amides using a liquid phase approach is described. Poly(ethylene glycol)(PEG) and p-hydroxybenzoic acid were linked by oxalyl chloride to give compound 1, which was chlorinated by thionyl chloride, followed by amidation with NHR1R2 to yield compound 3. Hydrolysis of compound 3 gave the title amide 4.These crude library members were obtained in good yields with high purities.

  4. Synthesis and characterization of some N-substituted amides of salicylic acid

    OpenAIRE

    Lupea Xenia Alfa; Padure Mirabela

    2003-01-01

    The synthesis of some N-substituted aromatic amides in the salicylic acid series was achieved, by direct reaction between primary amines and salicylic acid in inert organic solvent, in the presence of PCl3. The compounds that were obtained, partially not described in literature, were characterized by chemical-physical methods.

  5. Synthesis and characterization of some N-substituted amides of salicylic acid

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    Lupea Xenia Alfa

    2003-01-01

    Full Text Available The synthesis of some N-substituted aromatic amides in the salicylic acid series was achieved, by direct reaction between primary amines and salicylic acid in inert organic solvent, in the presence of PCl3. The compounds that were obtained, partially not described in literature, were characterized by chemical-physical methods.

  6. Palladium-catalyzed addition of potassium aryltrifluoroborates to aliphatic nitriles: synthesis of alkyl aryl ketones, diketone compounds, and 2-arylbenzo[b]furans.

    Science.gov (United States)

    Wang, Xingyong; Liu, Miaochang; Xu, Long; Wang, Qingzong; Chen, Jiuxi; Ding, Jinchang; Wu, Huayue

    2013-06-07

    A palladium-catalyzed addition of potassium aryltrifluoroborates to aliphatic nitriles has been developed, leading to a wide range of alkyl aryl ketones with moderate to excellent yields. Moreover, several dinitriles (e.g., malononitrile, glutaronitrile, and adiponitrile) were applicable to this process for the construction of 1,3-, 1,5-, or 1,6-dicarbonyl compounds. The scope of the developed approach is successfully explored toward the one-step synthesis of 2-arylbenzo[b]furans via sequential addition and intramolecular annulation reactions. The methodology accepted a wide range of substrates and is applicable to library synthesis.

  7. Group IB Organometallic Chemistry XXXIV: Thermal behavior and chemical reactivity of tetranuclear Me2N-substituted diarylpropenylcopper-copper anion (Vi2Cu4X2) and mixed diarylpropenyl/organocopper (Vi2Cu4R2) compounds

    NARCIS (Netherlands)

    Koten, G. van; Hoedt, R.W.M. ten; Noltes, J.G.

    1980-01-01

    Thermal decomposition of configurationally pure 1, 2-diarylpropenylcopper compounds Z-Vi{2}CU{4}Br{2} and Z-Vi{2}Cu{4}R{2} [Vi @? (2-Me{2}NC{6}H{4})C@?C(Me)-(C{6}H{4}Me-4), R @? 2-Me{2}NC{6}H{4} or 4-MeC{6}H{4}C@?C] predominantly results in the formation of ViH. In contrast, only dimers (ViVi) were

  8. Synthesis of N-substituted derivatives of 8,11-dimethyl-3,5-dioxo-4-azatricyclo[5.2.2.0(2,6)]undec-8-en-1-yl acetate and screening of cytotoxic activity of selected azatricycloundecane compounds.

    Science.gov (United States)

    Kossakowski, Jerzy; Kuran, Bozena

    2008-01-01

    This paper reports the synthesis of a number of aminoalkyl derivatives of 8,11-dimethyl-3,5-dioxo-4-azatricyclo[5.2.2.0(2,6)]undec-8-en-1-yl acetate and 1,11 -dimethyl-4-azatricyclo [5.2.2.0(2,6)]undecan-3,5,8-tri-one. Fourteen compounds were prepared and the in vitro cytotoxic activities were evaluated against human cancer cell lines originating from solid tumors in the National Cancer Institute, Bethesda, MD, USA.

  9. Group ib organometallic chemistry. XXXIV. Thermal behaviour and chemical reactivity of tetranuclear Me2N-substituted diarypropenylcopper-copper anion (Vi2Cu4X2) and mixed diarylpropenyl/organocopper (Vi2Cu4R2) compounds

    NARCIS (Netherlands)

    Hoedt, R.W.M. ten; Koten, G. van; Noltes, J.G.

    1980-01-01

    Thermal decomposition of configurationally pure 1,2-diarylpropenylcopper compounds Z-Vi2CU4Br2 and Z-Vi2Cu4R2 [Vi = (2-Me2NC6H4)C=C(Me)-(C6H4Me-4), R = 2-Me2NC6H4 or 4-MeC6H4CC] predominantly results in the formation of ViH. In contrast, only dimers (ViVi) were formed on thermolysis of (Z-ViCu2OTf)η

  10. A subset of N-substituted phenothiazines inhibits NADPH oxidases.

    Science.gov (United States)

    Seredenina, Tamara; Chiriano, Gianpaolo; Filippova, Aleksandra; Nayernia, Zeynab; Mahiout, Zahia; Fioraso-Cartier, Laetitia; Plastre, Olivier; Scapozza, Leonardo; Krause, Karl-Heinz; Jaquet, Vincent

    2015-09-01

    NADPH oxidases (NOXs) constitute a family of enzymes generating reactive oxygen species (ROS) and are increasingly recognized as interesting drug targets. Here we investigated the effects of 10 phenothiazine compounds on NOX activity using an extensive panel of assays to measure production of ROS (Amplex red, WST-1, MCLA) and oxygen consumption. Striking differences between highly similar phenothiazines were observed. Two phenothiazines without N-substitution, including ML171, did not inhibit NOX enzymes, but showed assay interference. Introduction of an aliphatic amine chain on the N atom of the phenothiazine B ring (promazine) conferred inhibitory activity toward NOX2, NOX4, and NOX5 but not NOX1 and NOX3. Addition of an electron-attracting substituent in position 2 of the C ring extended the inhibitory activity to NOX1 and NOX3, with thioridazine being the most potent inhibitor. In contrast, the presence of a methylsulfoxide group at the same position (mesoridazine) entirely abolished NOX-inhibitory activity. A cell-free NOX2 assay suggested that inhibition by N-substituted phenothiazines was not due to competition with NADPH. A functional implication of NOX-inhibitory activity of thioridazine was demonstrated by its ability to block redox-dependent myofibroblast differentiation. Our results demonstrate that NOX-inhibitory activity is not a common feature of all antipsychotic phenothiazines and that substitution on the B-ring nitrogen is crucial for the activity, whereas that on the second position of the C ring modulates it. Our findings contribute to a better understanding of NOX pharmacology and might pave the path to discovery of more potent and selective NOX inhibitors.

  11. The cleavage of the aryl-O-CH/sub 3/ bond using anisole as a model compound

    Energy Technology Data Exchange (ETDEWEB)

    Afifi, A.I.; Hindermann, J.P.; Chornet, E.; Overend, R.P.

    1989-04-01

    The thermal decomposition of anisole as a prototype of the aryl-methyl-ether linkage of lignin and coals has been studied under supercritical conditions using tetralin as hydrogen donor solvent. The effect of homogenous Lewis acid catalysts have also been studied under the same conditions. The main reaction products are phenol, benzene, toluene and cresols. At high tetralin to anisole ratios the selectivity to phenol is almost 80% with little or no cresol production. This selective conversion can be carried out rapidly and cleanly at high temperature (>450 degrees C). Kinetic studies were undertaken using pyrolytic, donor solvent hydrogenolytic and Lewis acid catalysed regimes in the temperature range 400-500 degrees C. The kinetics of anisole decomposition in a large excess of tetralin have been found to be in good agreement with those published in the literature. The Lewis acid catalysts lower the activation energy relative to the pyrolytic and hydrogenolytic cases. The kinetic studies and their mechanistic interpretation lead to a mechanism involving surprisingly few radical species: methyl, phenoxy, phenoxymethyl and phenyl radicals. In the presence of FeCl/sub 3/, the selectivity towards phenols and cresols is enhanced, though a side reaction leads to polymerization at low (400-420 degrees C) temperatures. It is concluded that the aryl-O-methyl ether linkage in anisole can easily be broken at high temperatures, 450-500 degrees C, in supercritical hydrogen donor solvent to give phenol in high yield and selectivity. 23 refs., 4 figs., 5 tabs.

  12. A New Synthetic Method for N-Substituted Selenoamides

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Benzotriazole, aldehydes and primary selenoamides react together with elimination of water to form 1:1:1 adducts which are reduced smoothly by NaBH4 to give the N-substituted selenoamides in good yield.

  13. SYNTHESIS OF BIOLOGICALLY ACTIVE 2-CHLORO-N-ALKYL/ARYL ACETAMIDE DERIVATIVES

    Directory of Open Access Journals (Sweden)

    S.A.Katke

    2011-07-01

    Full Text Available Medicinal chemistry plays an important role in development of drug for cure; maintain and improved health of human being. It is also equally important to design chemical entities for prevent the growth of micro-organism, which come in contact with human being in day-to-day life. We have synthesized 2-chloro-N-alkyl/aryl Acetamide derivatives with an aim as new bioactive agent, which can be used as anti microbial agents such as herbicides, antifungal, disinfectant. The present study involves the synthesis, purification and characterization of various N-substituted chloroacetamide derivatives. The chloroacetyl chloride treated with various aliphatic and aromatic amines at room temperature with stirring for few hours with monitoring reaction by thin layer chromatography gave 2-chloro-N-alkyl/aryl Acetamide as solid compounds. We checked the melting point of synthesized compounds with an open ended capillary tube method. The spectral techniques like Infra red and GC-MS have been used for characterization and establishment of structure of synthesized compounds. The antimicrobial screening of the synthesized chloroacetamides have shown excellent antibacterial and antifungalactivity.

  14. Predicting the sensitivity of fishes to dioxin-like compounds: possible role of the aryl hydrocarbon receptor (AhR) ligand binding domain.

    Science.gov (United States)

    Doering, Jon A; Giesy, John P; Wiseman, Steve; Hecker, Markus

    2013-03-01

    Dioxin-like compounds are chronically toxic to most vertebrates. However, dramatic differences in sensitivity to these chemicals exist both within and among vertebrate classes. A recent study found that in birds, critical amino acid residues in the aryl hydrocarbon receptor (AhR) ligand binding domain are predictive of sensitivity to dioxin-like compounds in a range of species. It is currently unclear whether similar predictive relationships exist for fishes, a group of animals at risk of exposure to dioxin-like compounds. Effects of dioxin-like compounds are mediated through the AhR in fishes and birds. However, AhR dynamics are more complex among fishes. Fishes possess AhRs that can be grouped within at least three distinct clades (AhR1, AhR2, AhR3) with each clade possibly containing multiple isoforms. AhR2 has been shown to be the active form in most teleosts, with AhR1 not binding dioxin-like compounds. The role of AhR3 in dioxin-like toxicity has not been established to date and this clade is only known to be expressed in some cartilaginous fishes. Furthermore, multiple mechanisms of sensitivity to dioxin-like compounds that are not relevant in birds could exist among fishes. Although, at this time, deficiencies exist for the development of such a predictive relationship for application to fishes, successfully establishing such relationships would offer a substantial improvement in assessment of risks of dioxin-like compounds for this class of vertebrates. Elucidation of such relationships would provide a mechanistic foundation for extrapolation among species to allow the identification of the most sensitive fishes, with the ultimate goal of the prediction of risk posed to endangered species that are not easily studied.

  15. A regioselective synthesis of benzopinacolones through aerobic dehydrogenative α-arylation of the tertiary sp3 C-H bond of 1,1-diphenylketones with aromatic and heteroaromatic compounds.

    Science.gov (United States)

    More, Nagnath Yadav; Jeganmohan, Masilamani

    2015-01-12

    A regioselective synthesis of symmetrical and unsymmetrical benzopinacolones through aerobic dehydrogenative α-arylation at the tertiary sp(3) C-H bond of substituted 1,1-diphenylketones with aromatic and heteroaromatic compounds, in the presence of K2S2O8 in CF3COOH at room temperature, is described. The reaction is proposed to go via a carbocation intermediate, which could be generated directly from cleavage of the sp(3) C-H bond of 1,1-diphenylketone. Subsequent α-arylation was achieved at the methene sp(3) carbon atom of the substituted ketone. A variety of substituted aromatic and heteroaromatic compounds were compatible with this reaction. In addition, benzopinacolones were converted into sterically hindered, tetrasubstituted alkenes and polycyclic aromatic compounds.

  16. Synthesis and biological activity of N-substituted-tetrahydro-γ-carbolines containing peptide residues

    Science.gov (United States)

    Sokolova, Nadezhda V; Sokolov, Vladimir B; Vinogradova, Daria V; Shevtsova, Elena F; Dubova, Ludmila G

    2014-01-01

    Summary The synthesis of novel peptide conjugates of N-substituted-tetrahydro-γ-carbolines has been performed using the sequence of the Ugi multicomponent reaction and Cu(I)-catalyzed click chemistry. The effect of obtained γ-carboline–peptide conjugates on the rat liver mitochondria was evaluated. It was found that all compounds in the concentration of 30 µM did onot induce depolarization of mitochondria but possessed some inhibitory effect on the mitochondria permeability transition. The original N-substituted-tetrahydro-γ-carbolines containing an terminal alkyne group demonstrated a high prooxidant activity, whereas their conjugates with peptide fragments slightly inhibited both autooxidation and the t-BHP-induced lipid peroxidation. PMID:24454569

  17. 3-(Substituted Aryl-1-benzofuranyl-2-propenones: Antimicrobial Properties of Some Chalcones-Type Compounds and their 2-Pyrazoline Derivatives

    Directory of Open Access Journals (Sweden)

    Demet Coskun

    2011-01-01

    Full Text Available 2-Acetylbenzofuran on condensation with furan-2-carboxaldehyde and pyrrole-2-carboxaldehyde in methanolic KOH solution yielded the corresponding benzofuran chalcones. These two compounds and nine benzofuran chalcones were synthesized before, were further reacted with hydrazine hydrate in ethanol which led to the formation of 2-pyrazoline derivatives. All the synthesized compounds were characterized by elemental analysis, melting point determination, infrared spectroscopy and nuclear magnetic resonance spectroscopy. Nine chalcone-type compounds and eleven 2-pyrazolines were evaluated for their biological activities against the six bacteria and the three yeast and it was seen that thirteen compounds showed activity. Four of them are chalcone-type compounds showed more or less activity.

  18. Activity of Antifungal Organobismuth(III Compounds Derived from Alkyl Aryl Ketones against S. cerevisiae: Comparison with a Heterocyclic Bismuth Scaffold Consisting of a Diphenyl Sulfone

    Directory of Open Access Journals (Sweden)

    Toshihiro Murafuji

    2014-07-01

    Full Text Available A series of hypervalent organobismuth(III compounds derived from alkyl aryl ketones [XBi(5-R'C6H3-2-COR(Ar] was synthesized to investigate the effect of the compounds’ structural features on their antifungal activity against the yeast Saccharomyces cerevisiae. In contrast to bismuth heterocycles [XBi(5-RC6H3-2-SO2C6H4-1'-] derived from diphenyl sulfones, a systematic quantitative structure-activity relationship study was possible. The activity depended on the Ar group and increased for heavier X atoms, whereas lengthening the alkyl chain (R or introducing a substituent (R' reduced the activity. IBi(C6H4-2-COCH3(4-FC6H4 was the most active. Its activity was superior to that of the related acyclic analogues ClBi[C6H4-2-CH2N(CH32](Ar and ClBi(C6H4-2-SO2 tert-Bu(Ar and also comparable to that of heterocyclic ClBi(C6H4-2-SO2C6H4-1'-, which was the most active compound in our previous studies. Density function theory calculations suggested that hypervalent bismuthanes undergo nucleophilic addition with a biomolecule at the bismuth atom to give an intermediate ate complex. For higher antifungal activity, adjusting the lipophilicity-hydrophilicity balance, modeling the three-dimensional molecular structure around the bismuth atom, and stabilizing the ate complex appear to be more important than tuning the Lewis acidity at the bismuth atom.

  19. Stereoselective synthesis of tricyclic compounds by intramolecular palladium-catalyzed addition of aryl iodides to carbonyl groups

    Science.gov (United States)

    Saadi, Jakub; Bentz, Christoph; Redies, Kai; Lentz, Dieter; Zimmer, Reinhold

    2016-01-01

    Summary Starting from γ-ketoesters with an o-iodobenzyl group we studied a palladium-catalyzed cyclization process that stereoselectively led to bi- and tricyclic compounds in moderate to excellent yields. Four X-ray crystal structure analyses unequivocally defined the structure of crucial cyclization products. The relative configuration of the precursor compounds is essentially transferred to that of the products and the formed hydroxy group in the newly generated cyclohexane ring is consistently in trans-arrangement with respect to the methoxycarbonyl group. A transition-state model is proposed to explain the observed stereochemical outcome. This palladium-catalyzed Barbier-type reaction requires a reduction of palladium(II) back to palladium(0) which is apparently achieved by the present triethylamine. PMID:27559374

  20. Syntheses and antimalarial activities of N-substituted 11-azaartemisinins.

    Science.gov (United States)

    Torok, D S; Ziffer, H; Meshnick, S R; Pan, X Q; Ager, A

    1995-12-22

    A two-step reaction sequence between artemisinin and methanolic ammonia followed by treatment with Amberlyst 15 yielded 11-azaartemisinin in 65% yield. Substituting a variety of primary alkyl- and heteroaromatic amines for ammonia in the reaction sequence yields N-substituted 11-azaartemisinins in similar or greater yield. When Amberlyst 15 is replaced by a mixture of sulfuric acid/silica gel, both 11-azaartemisinin and the expected metabolite, 10-azadesoxyartemisinin, are formed in 45% and 15% yields, respectively. In vitro and in vivo test data for a number of novel N-substituted 11-azaartemisinins, against drug-resistant strains of Plasmodium falciparum, show they possess antimalarial activities equal to or greater than that of artemisinin. The most active derivative, N-(2'-acetaldehydo)-11-azaartemisinin, 17, was 26 times more active in vitro and 4 times more active in vivo than artemisinin.

  1. Regioselective synthesis of 1-alkyl- or 1-aryl-1H-indazoles via copper-catalyzed cyclizations of 2-haloarylcarbonylic compounds.

    Science.gov (United States)

    Viña, Dolores; del Olmo, Esther; López-Pérez, José L; San Feliciano, Arturo

    2007-02-01

    [reaction: see text] A general method for the one-step regioselective synthesis of 1-alkyl- or 1-aryl-1H-indazoles from ortho-halogenated alkanoylphenones, benzophenones, and arylcarboxylic acids, via copper-catalyzed amination, was developed by using 0.2% mol of CuO in the presence of K(2)CO(3). The reaction involves amination followed by intramolecular dehydration. Different functionalized alkyl aryl ketones, diaryl ketones, and benzoic acid derivatives were efficiently coupled with several hydrazines. Ligands commonly employed as catalysts for intermolecular amination were shown to be ineffective for this cyclization.

  2. Design,Synthesis and Biological Activity of Ethyl 2-(N-Substituted-arylsulfonamido)-2-oxoacetate

    Institute of Scientific and Technical Information of China (English)

    WANG Bao-lei; WU Jing; HE Feng-qi; LI Yon-ghong; LI Zheng-ming

    2008-01-01

    Thirteen new ethyl 2-(N-substituted-arylsulfonamido)-2-oxoacetates(3a-3m),based on the structure of Ketol-acid reductoisomerase(KARI) inhibitor IpOHA,were designed and synthesized,Their structures were established on the basis of 1H NMR,IR,MS,and elemental analyses,The bioassay result reveals that the structural changes from hydroxyl group on the N atom of IpOHA to arylsulfonyl groups does not enhance the inhibitory activity of the compounds to KARI in vitro,Compounds 3c,3h,3k,and 3m are more effective than IpOHA against the monocotyledonous barnygrass at 100 μg/mL in herbicidal tests.

  3. Novel multicomponent synthesis of 2,9-dihydro-9-methyl-2-oxo-4-aryl- 1-pyrido[2,3-]indole-3-carbonitrile compounds

    Indian Academy of Sciences (India)

    Saman Damavandi; Reza Sandaroos

    2013-01-01

    Novel multicomponent approach for the synthesis of 2,9-dihydro-2-oxo-4-aryl-1-pyrido[2,3-]indole-3-carbonitrile derivatives via one-pot cyclocondensation reaction of substituted (triethoxymethyl) arene, 1-methyl-1-indol-2-ol and cyanoacetamide in the presence of silica supported ionic liquid [pmim]HSO4SiO2 (silica-supported 1-methyl-3-(triethoxysilylpropyl)imidazolium hydrogensulphate) has been reported.

  4. Exploring the effect of N-substitution in nor-lobelane on the interaction with VMAT2: discovery of a potential clinical candidate for treatment of methamphetamine abuse.

    Science.gov (United States)

    Zheng, Guangrong; Horton, David B; Penthala, Narsimha Reddy; Nickell, Justin R; Culver, John P; Deaciuc, Agripina G; Dwoskin, Linda P; Crooks, Peter A

    2013-03-01

    A series of N-substituted lobelane analogues was synthesized and evaluated for their [(3)H]dihydrotetrabenazine binding affinity at the vesicular monoamine transporter and for their inhibition of vesicular [(3)H]dopamine uptake. Compound 19a, which contains an N-1,2(R)-dihydroxypropyl group, had been identified as a potential clinical candidate for the treatment of methamphetamine abuse.

  5. Synthesis and biological evaluation of N-substituted polycyclic imides derivatives.

    Science.gov (United States)

    Bielenica, Anna; Struga, Marta; Mirosław, Barbara; Kozioł, Anna E; Kossakowski, Jerzy; Sanna, Giuseppina; La Colla, Paolo; Giliberti, Gabriele

    2013-01-01

    The preparation of 16 derivatives of 3,5,8-trioxo-4-azatricyclo- [5.2.2.0(2.6)]undec-1-yl acetate and 8 derivatives of 1-isobutoxy-4-azatricyclo[5.2.2.0(2.6)]undecane-3,5,8-trione was described. Substituents to the imide N-atom were alkyl-(aryl)piperazine fragments with an alkyl linker being propyl or butyl group. Selected newly obtained compounds were evaluated in vitro against anti-HIV-1 activity. A broad group o fderivatives were tested for their antibacterial and antifungal activity. The pharmacological properties of butyl derivatives of imide 6 were evaluated in three behavioral tests in mice. The molecular structures of starting polycyclic 6-acetyl-imides, 1 and 5, were determined by X-ray crystallography. Presented tests have not revealed any activity of the compounds, however, selected derivatives exerted no neurotoxicity in behavioral tests.

  6. Carbonate polymers containing ethenyl aryl moieties

    OpenAIRE

    1993-01-01

    There are disclosed carbonate polymers having ethenyl aryl moieties. Such carbonate polymers are prepared from one or more multi-hydric compounds and have an average degree of polymerization of at least about 1 based on multi-hydric compound. These polymers, including blends thereof, can be easily processed and shaped into various forms and structures according to the known techniques. During or subsequent to the processing, the polymers can be crosslinked, by exposure to heat or radiation, f...

  7. A facile synthesis of new 5-aryl-thiophenes bearing sulfonamide moiety via Pd(0-catalyzed Suzuki–Miyaura cross coupling reactions and 5-bromothiophene-2-acetamide: As potent urease inhibitor, antibacterial agent and hemolytically active compounds

    Directory of Open Access Journals (Sweden)

    Mnaza Noreen

    2017-01-01

    Full Text Available The present study reports a convenient approach for the synthesis of thiophene sulfonamide derivatives (3a–3k via Suzuki cross coupling reaction. This method of synthesis involved the reactions of various aryl boronic acids and esters with 5-bromthiophene-2-sulfonamide (2 under mild and suitable temperature conditions. The compounds synthesized in the present study were subjected to urease inhibition and hemolytic activities. The substitution pattern and the electronic effects of different functional groups (i.e., Cl, CH3, OCH3, F etc. available on the aromatic ring are found to have significant effect on the overall results. The compound 5-Phenylthiophene-2-sulfonamide 3a showed the highest urease inhibition activity with IC50 value ∼ 30.8 μg/mL compared with the thiourea (used as standard having IC50 value ∼ 43 μg/mL. Moreover, almost all of the compounds were examined for the hemolytic activity against triton X-100 with positive results obtained in most of the cases. In addition, the antibacterial activities of the derivatives of 5-arylthiophene-2-sulfonamide and 5-bromothiophene-2-acetamide were also investigated during the course of the study.

  8. Synthesis and anticonvulsant activity of 1-substituted benzyl-N-substituted-1, 2, 3-triazole-4-for-mamides

    Institute of Scientific and Technical Information of China (English)

    WANG Junmin; JUN Changsoo; CHAI Kyuyun; KWAK Kyungchell; QUAN Zheshan

    2006-01-01

    Substituted benzyl azids were synthesized through the reaction of substituted benzyl chloride and sodium azid, which subsequently underwent cyclization with ethyl propiolate and amidation to give thirteen 1-substituted benzyl-N-substituted-1, 2, 3-triazole-4-formamide derivatives (3a-3m). The structure of the synthesized compounds was confirmed by IR, 1H-NMR, MS and elemental analysis. Their anticonvulsant activity against maximal electrolshock (MES) induced seizure was tested and the result showed that all these compounds possess anticonvulsant activity in different degrees. Among those, the compounds containing chloro atoms on the phenyl ring were less potent in anticonvulsant activity, while introducing one or two fluorin atoms on benzyl system increased its activity. Furthermore, their activity decreased when there was substituent on the nitrogen atom of carboxamide, and the larger the substituent, the lower the activity.

  9. MICROWAVE ASSISTED SYNTHESIS AND EVALUATION OF SOME FLUORO, CHLORO 2-N (SUBSTITUTED SCHIFF’S BASES AMINO BENZOTHIAZOLES DERIVATIVES FOR THEIR ANTIINFLAMMATORY ACTIVITY

    Directory of Open Access Journals (Sweden)

    Muttu C.T

    2010-12-01

    Full Text Available The present research work is aimed to synthesize a series of various substituted benzothiazole derivatives containing 7-chloro-6-fluoro-N (substituted hydrozones - benzothiazole.Structures of compounds has been established by means of IR, 1H-NMR and elemental analysis. The compounds MIIIc, MIIIf and MIIIJ at dose 5 mg/kg and 10mg/kg body.wt were evaluated for anti-inflammatory activity using carragennan induced paw edema method. The selected compounds have shown significant anti-inflammatory activity as compared to the standard drug. Compound MIIIJ (10 mg/kg body weight has shown more significant result when compared with standard drug.

  10. Novel N-substituted aminobenzamide scaffold derivatives targeting the dipeptidyl peptidase-IV enzyme

    Directory of Open Access Journals (Sweden)

    Al-Balas QA

    2014-01-01

    Full Text Available Qosay A Al-Balas,1 Munia F Sowaileh,1 Mohammad A Hassan,1 Amjad M Qandil,1,2 Karem H Alzoubi,3 Nizar M Mhaidat,3 Ammar M Almaaytah,4 Omar F Khabour51Department of Medicinal Chemistry and Pharmacognosy, Faculty of Pharmacy, Jordan University of Science and Technology, Irbid, Jordan; 2Pharmaceutical Sciences Department, College of Pharmacy, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia; 3Department of Clinical Pharmacy, Faculty of Pharmacy, Jordan University of Science and Technology, Irbid, Jordan; 4Department of Pharmaceutical Technology, Faculty of Pharmacy, Jordan University of Science and Technology, Irbid, Jordan; 5Department of Medical Laboratory Sciences, Faculty of Applied Medical Sciences, Jordan University of Science and Technology, Irbid, JordanBackground: The dipeptidyl peptidase-IV (DPP-IV enzyme is considered a pivotal target for controlling normal blood sugar levels in the body. Incretins secreted in response to ingestion of meals enhance insulin release to the blood, and DPP-IV inactivates these incretins within a short period and stops their action. Inhibition of this enzyme escalates the action of incretins and induces more insulin to achieve better glucose control in diabetic patients. Thus, inhibition of this enzyme will lead to better control of blood sugar levels.Methods: In this study, computer-aided drug design was used to help establish a novel N-substituted aminobenzamide scaffold as a potential inhibitor of DPP-IV. CDOCKER software available from Discovery Studio 3.5 was used to evaluate a series of designed compounds and assess their mode of binding to the active site of the DPP-IV enzyme. The designed compounds were synthesized and tested against a DPP-IV enzyme kit provided by Enzo Life Sciences. The synthesized compounds were characterized using proton and carbon nuclear magnetic resonance, mass spectrometry, infrared spectroscopy, and determination of melting point.Results: Sixty

  11. Study on PP Flame Retarded with Aryl Phosphate and Intumescent Flame Retardant Compound%不同芳基磷酸酯与膨胀型阻燃剂复配阻燃PP的研究

    Institute of Scientific and Technical Information of China (English)

    刘琼宇; 赖学军; 张海丽; 尹昌宇; 李红强; 曾幸荣

    2012-01-01

    Different kinds of aryl phosphate, such as resorcino! bis(diphenyl phosphate)(RDP), bisphenol A bisfdiphenyl phosphate)(BDP), tri-methyl-phenyl phosphate (TCP) and tri-isopmpylated phenyi phosphate(IPP), were compounded with intumescent flame retardant (IFR) to prepare the flame-retardant polypropylene (PP). The synergistic effects of the aryl phosphates on the flame retardancy, thermostability and mechanical properties of PP/IFR composite were investigated by thermogravimetric analysis (TGA) and scanning electron microscope (SEM). The results show that: the aryl phosphates has good synergistic effect with IFR on flame retardant PP. When the content of the aryl phosphate is 5%, the oxygen index (Ol) values of PP/IFR/TCP, PP/IFR/IPP, PP/IFR/RDP and PP/IFR/BDP composites increase from 28.5% of PP/IFR to 29.5%, 30.0%, 30.5%, and 29.5% respectively, and the UL-94 rating improves from V-1 to V-0. Meanwhile, the thermostability of PP/IFR composite enhances with the addition of RDP and BDP, the char residues of composites at 500℃ is up to 15.4% and 12.9%, respectively. Futhermore, with the addition of RDP and BDP, the dispersion of IFR in PP improves and then the mechanical properties of the composites increase.%采用间苯二酚双(二苯基)磷酸酯(RDP)、双酚A双(二苯基)磷酸酯(BDP)、磷酸三甲苯酯(TCP)和异丙苯基磷酸酯(IPP)作为阻燃协效剂与膨胀型阻燃剂(IFR)复配阻燃聚丙烯(PP).研究了芳基磷酸酯的种类对PP/IFR复合材料阻燃性能、热稳定性能和力学性能的影响,并通过热重分析(TGA)、扫描电镜(SEM)等对材料进行了表征.结果表明:芳基磷酸酯对PP/IFR复合材料具有一定的协同阻燃作用.当芳基磷酸酯用量为5.0%时,PP/IFR/TCP、PP/IFR/IPP、PP/IFR/RDP和PP/IFR/BDP复合材料的氧指数(OI)由PP/IFR的28.5%分别提高到29.5%、30.0%、30.5%和29.5%,垂直燃烧级别由UL 94V-1级提升至UL 94V-0级;同时,RDP和BDP可提高PP/IFR

  12. N-Substituted piperazinyl quinolones as potential cytotoxic agents: structure-activity relationships study.

    Science.gov (United States)

    Foroumadi, Alireza; Emami, Saeed; Rajabalian, Saeed; Badinloo, Marziyeh; Mohammadhosseini, Negar; Shafiee, Abbas

    2009-03-01

    As part of a continuing search for new potential anticancer candidates in the piperazinyl quinolone series, the cytotoxicity evaluation of new N-substituted piperazinyl quinolones was of our interest. The growth inhibitory activities of 12 new compounds, namely N-[2-(5-chlorothiophen-2-yl)-2-oxoethyl] and N-[2-(5-chlorothiophen-2-yl)-2-oxyiminoethyl] piperazinyl quinolones 1-12 were determined against six cancer cell lines using MTT colorimetric assay. Preliminary screening showed that most of the new N-[2-(5-chlorothiophen-2-yl)ethyl]piperazinyl quinolones 4-12 containing (un)substituted oxime moiety showed significant cytotoxic activity and the modification of functionality on ethyl spacer produced a relatively minor change of activity. Thus, in the piperazinyl quinolone series, cytotoxic activity can be positively modulated through the introduction of 2-(5-chlorothiophen-2-yl)ethyl residue on the piperazine ring. The results revealed that the introduction of 2-(5-chlorothiophen-2-yl)ethyl moiety on the piperazine ring of quinolone antibacterials (ciprofloxacin, norfloxacin and enoxacin) changes the biological profile of piperazinyl quinolones from antibacterials to cytotoxic agents.

  13. Polypeptoids from N -Substituted Glycine N -Carboxyanhydrides: Hydrophilic, Hydrophobic, and Amphiphilic Polymers with Poisson Distribution

    KAUST Repository

    Fetsch, Corinna

    2011-09-13

    Preparation of defined and functional polymers has been one of the hottest topics in polymer science and drug delivery in the recent decade. Also, research on (bio)degradable polymers gains more and more interest, in particular at the interface of these two disciplines. However, in the majority of cases, combination of definition, functionality and degradability, is problematic. Here we present the preparation and characterization (MALDI-ToF MS, NMR, GPC) of nonionic hydrophilic, hydrophobic, and amphiphilic N-substituted polyglycines (polypeptoids), which are expected to be main-chain degradable and are able to disperse a hydrophobic model compound in aqueous media. Polymerization kinetics suggest that the polymerization is well controlled with strictly linear pseudo first-order kinetic plots to high monomer consumption. Moreover, molar mass distributions of products are Poisson-type and molar mass can be controlled by the monomer to initiator ratio. The presented polymer platform is nonionic, backbone degradable, and synthetically highly flexible and may therefore be valuable for a broad range of applications, in particular as a biomaterial. © 2011 American Chemical Society.

  14. Structural Requirements of N-Substituted Spiropiperidine Analogues as Agonists of Nociceptin/Orphanin FQ Receptor

    Directory of Open Access Journals (Sweden)

    Ling Yang

    2011-12-01

    Full Text Available The nociceptin/orphanin FQ (NOP receptor is involved in a wide range of biological functions, including pain, anxiety, depression and drug abuse. Especially, its agonists have great potential to be developed into anxiolytics. In this work, both the ligand- and receptor-based three-dimensional quantitative structure–activity relationship (3D-QSAR studies were carried out using comparative molecular field analysis (CoMFA and comparative molecular similarity indices analysis (CoMSIA techniques on 103 N-substituted spiropiperidine analogues as NOP agonists. The resultant optimal ligand-based CoMSIA model exhibited Q2 of 0.501, R2ncv of 0.912 and its predictive ability was validated by using an independent test set of 26 compounds which gave R2pred value of 0.818. In addition, docking analysis and molecular dynamics simulation (MD were also applied to elucidate the probable binding modes of these agonists. Interpretation of the 3D contour maps, in the context of the topology of the active site of NOP, provided insight into the NOP-agonist interactions. The information obtained from this work can be used to accurately predict the binding affinity of related agonists and also facilitate the future rational design of novel agonists with improved activity.

  15. Facile and Stereoselective Synthesis of N-Substituted Benzotriazole with Baylis-Hillman Adducts

    Institute of Scientific and Technical Information of China (English)

    Jian LI; Yun Kui LIU; Yong Min ZHANG

    2006-01-01

    A convenient method has been developed toward the stereoselective synthesis of N-substituted benzotriazole derivatives under mild conditions. The good stereolectivity, high yields and the simple procedure make the present protocol attractive.

  16. Peripheral arylation of subporphyrazines.

    Science.gov (United States)

    Higashino, Tomohiro; Rodríguez-Morgade, M Salomé; Osuka, Atsuhiro; Torres, Tomás

    2013-07-29

    Peripherally hexaarylated subporphyrazines (SubPzs) have been prepared through a Pd-catalyzed, CuTC-mediated coupling of a hexaethylsulfanylated subporphyrazine with arylboronic acids. The introduced aryl substituents strongly influence the electronic properties of the subporphyrazine through effective conjugative interaction. Aryl rings endowed with π-electron-donating groups at the para positions produce a remarkable perturbation of the electron density of the SubPz macrocycle. This is reflected through significant redshifts of the SubPz CT and Q-bands, together with increase of the molar absorptivity of the former, with respect to those exhibited by the hexaphenyl-SubPz 2 a. Moreover, the trend in the first SubPz reduction potentials correlates with the Hammett constants (σp ) corresponding to the para substituents of the aryl. The domed, extended SubPz π-system self-assembles in the solid state to form a dimeric capsule that houses a solvent molecule.

  17. A mechanism-based mathematical model of aryl hydrocarbon receptor-mediated CYP1A induction in rats using beta-naphthoflavone as a tool compound.

    Science.gov (United States)

    Chen, Emile P; Chen, Liangfu; Ji, Yan; Tai, Guoying; Wen, Yuan H; Ellens, Harma

    2010-12-01

    β-Naphthoflavone (BNF) is a synthetic flavone that selectively and potently induces CYP1A enzymes via aryl hydrocarbon receptor activation. Mechanism-based mathematical models of CYP1A enzyme induction were developed to predict the time course of enzyme induction and quantitatively evaluate the interrelationship between BNF plasma concentrations, hepatic CYP1A1 and CYP1A2 mRNA levels, and CYP1A enzyme activity in rats in vivo. Male Sprague-Dawley rats received a continuous intravenous infusion of vehicle or 1.5 or 6 mg · kg(-1) · h(-1) BNF for 6 h, with blood and liver sampling. Plasma BNF concentrations were determined by liquid chromatography-tandem mass spectrometry. Hepatic mRNA levels of CYP1A1 and CYP1A2 were determined by TaqMan. Ethoxyresorufin O-deethylation was used to measure the increase in CYP1A enzyme activity as a result of induction. The induction of hepatic CYP1A1/CYP1A2 mRNA and CYP1A activity occurred within 2 h after BNF administration. This caused a rapid increase in metabolic clearance of BNF, resulting in plasma concentrations declining during the infusion. Overall, the enzyme induction models developed in this study adequately captured the time course of BNF pharmacokinetics, CYP1A1/CYP1A2 mRNA levels, and increases in CYP1A enzyme activity data for both dose groups simultaneously. The model-predicted degradation half-life of CYP1A enzyme activity is comparable with previously reported values. The present results also confirm a previous in vitro finding that CYP1A1 is the predominant contributor to CYP1A induction. These physiologically based models provide a basis for predicting drug-induced toxicity in humans from in vitro and preclinical data and can be a valuable tool in drug development.

  18. Syntheses of aporphine and homoaporphine alkaloids by intramolecular ortho-arylation of phenols with aryl halides via SRN1 reactions in liquid ammonia.

    Science.gov (United States)

    Barolo, Silvia M; Teng, Xin; Cuny, Gregory D; Rossi, Roberto A

    2006-10-27

    The photostimulated intramolecular ortho-arylation reactions of bromoarenes linked with pendant phenoxy containing N-substituted tetrahydroisoquinolines in liquid ammonia afforded aporphine (54-82% yield) alkaloid derivatives via SRN1 reactions. This strategy was extended for the first time to the synthesis of a homoaporphine derivative (40% yield). Tetrahydroisoquinoline precursors that contained electron-withdrawing groups on nitrogen (i.e., amides, sulfonamides, and carbamates) gave cyclized products, whereas precursors with basic nitrogens (i.e., NH or NMe) either failed to yield cyclized products or gave aporphines in only low yield.

  19. Synthesis and biological evaluation of N-substituted noscapine analogues.

    Science.gov (United States)

    DeBono, Aaron J; Xie, Jin Han; Ventura, Sabatino; Pouton, Colin W; Capuano, Ben; Scammells, Peter J

    2012-12-01

    Noscapine is a phthalideisoquinoline alkaloid isolated from the opium poppy Papaver somniferum. It has long been used as an antitussive agent, but has more recently been found to possess microtubule-modulating properties and anticancer activity. Herein we report the synthesis and pharmacological evaluation of a series of 6'-substituted noscapine derivatives. To underpin this structure-activity study, an efficient synthesis of N-nornoscapine and its subsequent reduction to the cyclic ether derivative of N-nornoscapine was developed. Reaction of the latter with a range of alkyl halides, acid chlorides, isocyanates, thioisocyanates, and chloroformate reagents resulted in the formation of the corresponding N-alkyl, N-acyl, N-carbamoyl, N-thiocarbamoyl, and N-carbamate derivatives, respectively. The ability of these compounds to inhibit cell proliferation was assessed in cell-cycle cytotoxicity assays using prostate cancer (PC3), breast cancer (MCF-7), and colon cancer (Caco-2) cell lines. Compounds that showed activity in the cell-cycle assay were further evaluated in cell viability assays using PC3 and MCF-7 cells.

  20. Modular approach to novel chiral aryl-ferrocenyl phosphines by Suzuki cross-coupling

    DEFF Research Database (Denmark)

    Jensen, Jakob Feldthusen; Søtofte, Inger; Sorensen, H.O.;

    2002-01-01

    Two novel planar chiral and atropisomeric P,N and P,O aryl-ferrocenyl ligand systems have been developed. The strategy is short and involves a new synthetic approach to aryl-ferrocenyl compounds via a Suzuki cross-coupling procedure. The modular design can easily give access to variety of chiral ...

  1. Structure and biological properties of first row d-transition metal complexes with N-substituted sulfonamides.

    Science.gov (United States)

    Chohan, Zahid H; Supuran, Claudiu T

    2008-04-01

    Cobalt (II), copper (II), nickel (II) and zinc (II) complexes with 2-hydroxy-1-naphthaldehyde derived N-substituted sulfonamides have been synthesized and the nature of bonding and structure of compounds have been deduced from physical, analytical and spectral (IR, (1)H NMR, (13)C NMR, Mass and electronic) data. An octahedral geometry has been suggested for the complexes. Complexes along with the ligands were assessed for their antibacterial and antifungal activities on different species of pathogenic bacteria and fungi. The results revealed the ligands to possess moderate to significant antibacterial activity which was, in many cases, enhanced on chelation. Similar results were observed for antifungal activity. Brine shrimp bioassay was also carried out for in vitro cytotoxic properties against Artemia salina.

  2. Synthesis and Screening of Some New N-Substituted Derivatives of N-(4-Methylpyridin-2-ylbenzenesulfonamides as Potential Antibacterial Agents

    Directory of Open Access Journals (Sweden)

    Aziz-ur-Rehman

    2014-03-01

    Full Text Available The two step synthesis of a series of N-substituted derivatives of N-(4-Methylpyridin-2-ylbenzenesulfonamide with potential antibacterial activity, has been reported. First step includes the synthesis of N-(4-Methylpyridin-2-ylbenzenesulfonamide (3 by reaction of 2-Amino-4-methylpyridine (1 and Benzenesulfonyl chloride (2 in a slightly basic aqueous medium. The molecule 3 was converted to N-Alkyl/aralkyl-N-(4-methylpyridin-2-ylbenzenesulfonamide derivatives, 5a-f, on treatment with alkyl/aralkyl halides, 4a-f, using lithium hydride as activator in N,N-dimethylformamide. The synthesized molecules were well corroborated by 1H-NMR, IR and EI-MS spectral data and evaluated for antibacterial activity against four gram-negative and two gram-positive bacteria. The evaluation results rendered these compounds as moderately good inhibitors and may be employed as therapeutic agent for certain inflammatory ailments.

  3. Pyrimidine non-nucleoside analogs: A direct synthesis of a novel class of N-substituted amino and N-sulfonamide derivatives of pyrimidines.

    Science.gov (United States)

    Elgemeie, Galal H; Salah, Ali M; Abbas, Nermeen S; Hussein, Hoda A; Mohamed, Reham A

    2017-03-04

    A convenient method for the regioselective synthesis of pyrimidine non-nucleoside analogs was developed. This study reports a novel and efficient method for the synthesis of a new type of N-substituted amino methylsulfanylpyrimidines and the corresponding pyrazolo[3,4-d]pyrimidines. This series of compounds was designed through the reaction of dimethyl N-cyanodithioiminocarbonate with 2-cyano-N'-(thiophen-2-yl-, furan-2-yl- and pyridin-4-ylmethylene)acetohydrazide and N'-(2-cyanoacetyl)arylsulfonohydrazides. The scope and limitation of the method are demonstrated. The antibacterial and antifungal activities of the synthesized compounds were also evaluated.

  4. Synthesis, studies and in-vitro antibacterial activity of N-substituted 5-(furan-2-yl-phenyl pyrazolines

    Directory of Open Access Journals (Sweden)

    Mamta Rani

    2015-03-01

    Full Text Available Novel compounds with antibacterial properties: pyrazoline derivatives were synthesized by the cyclization of various -1-[2-(alkoxyphenyl]-3-(furan-2-yl prop-2-en-1-one 1a–1d with N-substituted phenyl hydrazine in the presence of CH3COOH in ethanol. The structures of these compounds were elucidated by, IR, 1H NMR, 13C NMR, ESI-MS spectral data and their purities were confirmed by elemental analyses. The in vitro antibacterial activity of these compounds was evaluated against two Gram-positive and two Gram-negative bacteria Aeromonas hydrophila, Yersinia enterocolitica, Listeria monocytogenes, and Staphylococcus aureus by microdilution method and then the minimum inhibitory concentration (MIC of compounds were determined. The results showed that compounds (5R-5-(furan-2-yl-1-phenyl-3-[2-(benzyloxyphenyl]-4, 5-dihydro-1H-pyrazole (2b and (5R-5-(furan-2-yl-1-phenyl-3-[2-(naphthalen-2-ylmethoxy prop-2-en-1-yloxyphenyl]-4,5-dihydro-1H-pyrazole (2d showing most promising antibacterial activities as compared to Gentamicin and Tetracycline are given.

  5. Anti-Inflammatory Activity of a Novel Family of Aryl Ureas Compounds in an Endotoxin-Induced Airway Epithelial Cell Injury Model

    Science.gov (United States)

    Cabrera-Benitez, Nuria E.; Pérez-Roth, Eduardo; Casula, Milena; Ramos-Nuez, Ángela; Ríos-Luci, Carla; Rodríguez-Gallego, Carlos; Sologuren, Ithaisa; Jakubkiene, Virginija; Slutsky, Arthur S.; Padrón, José M.; Villar, Jesús

    2012-01-01

    Background Despite our increased understanding of the mechanisms involved in acute lung injury (ALI) and the acute respiratory distress syndrome (ARDS), there is no specific pharmacological treatment of proven benefit. We used a novel screening methodology to examine potential anti-inflammatory effects of a small structure-focused library of synthetic carbamate and urea derivatives in a well established cell model of lipopolysaccharide (LPS)-induced ALI/ARDS. Methodology/Principal Findings After a pilot study to develop an in vitro LPS-induced airway epithelial cell injury model, a library of synthetic carbamate and urea derivates was screened against representative panels of human solid tumor cell lines and bacterial and fungal strains. Molecules that were non-cytotoxic and were inactive in terms of antiproliferative and antimicrobial activities were selected to study the effects on LPS-induced inflammatory response in an in vitro cell culture model using A549 human alveolar and BEAS-2B human bronchial cells. These cells were exposed for 18 h to LPS obtained from Escherichia coli, either alone or in combination with the test compounds. The LPS antagonists rhein and emodin were used as reference compounds. The most active compound (CKT0103) was selected as the lead compound and the impact of CKT0103 on pro-inflammatory IL-6 and IL-8 cytokine levels, expression of toll-like receptor-4 (TLR4) and nuclear factor kappa B inhibitor alpha (IκBα) was measured. CKT0103 significantly inhibited the synthesis and release of IL-6 and IL-8 induced by LPS. This suppression was associated with inhibition of TLR4 up-regulation and IκBα down-regulation. Immunocytochemical staining for TLR4 and IκBα supported these findings. Conclusions/Significance Using a novel screening methodology, we identified a compound – CKT0103 – with potent anti-inflammatory effects. These findings suggest that CKT0103 is a potential target for the treatment of the acute phase of sepsis and

  6. Anti-inflammatory activity of a novel family of aryl ureas compounds in an endotoxin-induced airway epithelial cell injury model.

    Directory of Open Access Journals (Sweden)

    Nuria E Cabrera-Benitez

    Full Text Available BACKGROUND: Despite our increased understanding of the mechanisms involved in acute lung injury (ALI and the acute respiratory distress syndrome (ARDS, there is no specific pharmacological treatment of proven benefit. We used a novel screening methodology to examine potential anti-inflammatory effects of a small structure-focused library of synthetic carbamate and urea derivatives in a well established cell model of lipopolysaccharide (LPS-induced ALI/ARDS. METHODOLOGY/PRINCIPAL FINDINGS: After a pilot study to develop an in vitro LPS-induced airway epithelial cell injury model, a library of synthetic carbamate and urea derivates was screened against representative panels of human solid tumor cell lines and bacterial and fungal strains. Molecules that were non-cytotoxic and were inactive in terms of antiproliferative and antimicrobial activities were selected to study the effects on LPS-induced inflammatory response in an in vitro cell culture model using A549 human alveolar and BEAS-2B human bronchial cells. These cells were exposed for 18 h to LPS obtained from Escherichia coli, either alone or in combination with the test compounds. The LPS antagonists rhein and emodin were used as reference compounds. The most active compound (CKT0103 was selected as the lead compound and the impact of CKT0103 on pro-inflammatory IL-6 and IL-8 cytokine levels, expression of toll-like receptor-4 (TLR4 and nuclear factor kappa B inhibitor alpha (IκBα was measured. CKT0103 significantly inhibited the synthesis and release of IL-6 and IL-8 induced by LPS. This suppression was associated with inhibition of TLR4 up-regulation and IκBα down-regulation. Immunocytochemical staining for TLR4 and IκBα supported these findings. CONCLUSIONS/SIGNIFICANCE: Using a novel screening methodology, we identified a compound - CKT0103 - with potent anti-inflammatory effects. These findings suggest that CKT0103 is a potential target for the treatment of the acute phase of

  7. Menthone aryl acid hydrazones: a new class of anticonvulsants.

    Science.gov (United States)

    Jain, Jainendra; Kumar, Y; Sinha, Reema; Kumar, Rajeev; Stables, James

    2011-01-01

    A series of ten compounds (Compounds J(1)-J(10)) of (±) 3-menthone aryl acid hydrazone was synthesized and characterized by thin layer chromatography and spectral analysis. Synthesized compounds were evaluated for anticonvulsant activity after intraperitoneal (i.p) administration to mice by maximal electroshock (MES) and subcutaneous pentylenetetrazole (scPTZ) induced seizure method and minimal clonic seizure test. Minimal motor impairment was also determined for these compounds. Results obtained showed that four compounds out of ten afforded significant protection in the minimal clonic seizure screen at 6 Hz. Compound J(6), 4-Chloro-N-(2-isopropyl-5-methylcyclohexylidene) benzohydrazide was found to be the most active compound with MES ED(50) of 16.1 mg/kg and protective index (pI) of greater than 20, indicating that (±) 3-menthone aryl acid hydrazone possesses better and safer anticonvulsant properties than other reported menthone derivatives viz. menthone Schiff bases, menthone semicarbazides and thiosemicarbazides.

  8. Synthesis of aryl phosphates based on pyrimidine and triazine scaffolds.

    Science.gov (United States)

    Courme, Caroline; Gresh, Nohad; Vidal, Michel; Lenoir, Christine; Garbay, Christiane; Florent, Jean-Claude; Bertounesque, Emmanuel

    2010-01-01

    The syntheses of the triazinyl-based bis-aryl phosphates 2 and 3, and of the aminopyrimidyl-based aryl phosphate 4 are described. Each compound contains a diaryl ether-phosphate structural motif. The synthetic route to bis-aryl phosphates 2 and 3 consisted in two nucleophilic substitution reactions with amines from cyanuric chloride, followed by a Suzuki coupling with the resulting 2,4-diamino-6-chloro-1,3,5-triazine derivative 12 to introduce the diaryl ether functionality. Aryl phosphate 4 was obtained via condensation of aryl guanidine 34 with aryloxyphenyl butenone 31. These de novo-designed aryl phosphates were evaluated as potential inhibitors of the Grb2-SH2 domain using an ELISA assay. The water-soluble sodium salt 26 of 3 gave an IC(50) value in the high micromolar range. Molecular modeling studies were subsequently performed upon modifying the 1,3,5-trisubstituted triazine scaffold of 3. Non-phosphate derivatives encompassing cyclopropane, pyrrole, keto-acid, and IZD fragments were thus step-wise designed and their Grb2-SH2 complexes were modeled by molecular dynamics. Some derivatives gave rise to an enriched pattern of H-bonds and cation-pi interactions with Grb2-SH2.

  9. Palladium-catalyzed aryl amination-heck cyclization cascade: A one-flask approach to 3-substituted Indoles

    DEFF Research Database (Denmark)

    Jensen, Thomas; Pedersen, Henrik; Bang-Andersen, B.;

    2008-01-01

    Two for the price of one: A Pd/dppf-based catalyst provides access to the title compounds from 1,2-dihalogenated aromatic compounds and allylic amines in a single reaction flask. The initial aryl amination step occurs with excellent selectivity for the aryl iodide to ensure the formation of a sin...

  10. Synthesis and Biological Activities of 3-(2-Furyl)-4-aryl- 1, 2, 4-triazole-5-thiones

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    A series of novel compounds 3-(2-furyl)-4-aryl-l, 2, 4-triazole-5-thiones have been synthesized. All the compounds were characterized by spectral data and elemental analysis. The preliminary biological test showed that some of them exhibited excellent plant-growth regulative acl ivities.

  11. Direct N9-arylation of purines with aryl halides

    DEFF Research Database (Denmark)

    Larsen, Anders Foller; Ulven, Trond

    2014-01-01

    An efficient method for N-arylation of purines is reported. The N-arylation is catalysed by Cu(i) and 4,7-bis(2-hydroxyethylamino)-1,10-phenanthroline (BHPhen) in aqueous DMF or ethanol. The reaction generally proceeds with high selectivity for the N(9)-position....

  12. Synthesis of 3-fluoro-3-aryl oxindoles: Direct enantioselective α arylation of amides

    KAUST Repository

    Wu, Linglin

    2012-02-06

    Modus operandi: Catalytic access to the title compounds through a new asymmetric α-arylation protocol is reported (see scheme). These products are formed in good yields and excellent enantioselectivities by using a new and easily synthesized chiral N-heterocyclic carbene (NHC) ligand. Advanced DFT calculations reveal the properties of the NHC ligand and the mode of operation of the catalyst. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  13. STUDY ON THE SYNTHESIS OF COPOLYMER CONTAINING N-SUBSTITUTED ACRYLAMIDE COMPONENT

    Institute of Scientific and Technical Information of China (English)

    LI Xuefen; WANG Shenguo; LI Zhifen

    1984-01-01

    In this paper the synthesis of linear and crosslinked N-substituted acrylamide copolymer is reported. In order to obtain the terpolymer with appropriate hydrophilicity, the conditions of aminolysis of St-MMA copolymer have been selected.It is shown that the copolymer with predictable hydrophilicity possesses good blood compatibility.

  14. Modular Access to N-Substituted cis-3,5-Diaminopiperidines

    NARCIS (Netherlands)

    Blond, Aurelie; Dockerty, Paul; Alvarez, Raquel; Turcaud, Serge; Lecourt, Thomas; Micouin, Laurent

    2013-01-01

    A sequence of oxidative cleavage/reductive amination/hydrogenolysis enables the preparation of N-substituted cis-3,5-diaminopiperidines from a readily available bicyclic hydrazine. This new synthetic route provides a simple and general access to RNA-friendly fragments with a good chemical diversity.

  15. A Direct Transformation of Aryl Aldehydes to Benzyl Iodides Via Reductive Iodination

    Energy Technology Data Exchange (ETDEWEB)

    Ruso, Jayaraman Sembian; Rajendiran, Nagappan; Kumaran, Rajendran Senthil [Univ. of Madras, Chennai (India)

    2014-02-15

    A facile transformation of aryl aldehydes to benzyl iodides through one-pot reductive iodination is reported. This protocol displays remarkable functional group tolerance and the title compound was obtained in good to excellent yield.

  16. N-Substituted-2-butyl-5-chloro-3H-imidazole-4-carbaldehyde derivatives as anti-tumor agents against Ehrlich ascites tumor cells in vivo.

    Science.gov (United States)

    Kumar, C Anil; Swamy, S Nanjunda; Gaonkar, S L; Basappa; Salimath, Bharathi P; Rangappa, Kanchugarakoppal S

    2007-05-01

    A new series of N-substituted 2-butyl-5-chloro-3H-imidazole-4-carbaldehyde derivatives were synthesized by using the different bioactive heteroaralkyl halides with 2-butyl-4-chloro-1H-imidazole-5-carbaldehyde in presence of powdered potassium carbonate in DMF medium. These compounds were screened for their antitumor activity. Our results show that treatment of imidazole derivatives inhibit proliferation EAT cells, decreases the ascites volume and increases the survivability of the animals in vivo. These compounds also inhibited the cellular proliferation of HUVEC cells in vitro by MTT assay. Further, these compounds could induce apoptosis, which is evident by the nuclear condensation of imidazole derivatives treated EAT cells in vivo by the cytological analysis. We have identified that pyrrolidine substituted imidazole derivative as potent anti-tumor compound. These inhibitors could represent as promising candidates for anticancer therapies, where the formation of peritoneal malignant ascites is a major cause of morbidity and mortality.

  17. Effects of 2-alkylthio-6-aminobenzothiazoles and their 6-N-substituted derivatives on photosynthesis inhibition in Chlorella vulgaris and spinach chloroplasts.

    Science.gov (United States)

    Král'ová, K; Sersen, F; Sidóová, E

    1993-10-01

    2-Alkylthio-6-aminobenzothiazoles and their 6-N-substituted derivatives 3-(2-alkylthio-6-benzothiazolylaminomethyl)-2-benzothiazolineth iones and 3-(2-alkylthio-6-benzothiazolylaminomethyl)-6-bromo-2-benzothia zolinones inhibit photosynthetic processes in spinach chloroplasts and the chlorophyll production in Chlorella vulgaris. The inhibitory activity depends on the alkyl chain length of the thioalkyl substituent. The site of action of the effectors studied is on the donor side of photosystem 2 before the site of action of diphenylcarbazide. The highest antialgal effects were exhibited by compounds containing bromine.

  18. Synthesis and fungicidal activity of aryl carbamic acid-5-aryl-2-furanmethyl ester.

    Science.gov (United States)

    Li, Ying; Li, Bao-Ju; Ling, Yun; Miao, Hong-Jian; Shi, Yan-Xia; Yang, Xin-Ling

    2010-03-10

    Chitin, a major structural component of insect cuticle and fungus cell wall but absent in plants and vertebrates, is regarded as a safe and selective target for pest control agents. Chitin synthesis inhibitors (CSIs) have been well-known as insect growth regulators (IGRs) but rarely found as fungicides in agriculture. To find novel CSIs with good activity, benzoylphenylurea, a typical kind of CSIs, was chosen as the lead compound and 26 novel aryl carbamic acid-5-aryl-2-furanmethyl esters were designed by converting the urea linkages of benzoylphenylureas to carbamic acid esters and changing the aniline parts into furanmethyl groups. The title compounds were synthesized and their structures confirmed by IR, (1)H NMR, and elemental analysis. Preliminary insecticidal and fungicidal bioassays were carried out. The results indicated that the title compounds had no insecticidal effect on Culex pipiens pallens and Plutella xylostella Linnaeus , but most compounds exhibited good fungicidal activities against Corynespora cassiicola , Thanatephorus cucumeris , Botrytis cinerea , and Fusarium oxysporum . In particular, compounds V-4, V-6, V-7, and V-8 showed better activities against the four strains than those of the commercialized fungicides. The morphologic result suggested that compound V-21 had disturbed the cell wall formation of C. cassiicola. The results indicated that modification on the urea linkage of benzoylphenylurea was an effective way to discover new candidates for fungicides.

  19. Aryl diazonium salts new coupling agents and surface science

    CERN Document Server

    Chehimi, Mohamed Mehdi

    2012-01-01

    Diazonium compounds are employed as a new class of coupling agents to link polymers, biomacromolecules, and other species (e. g. metallic nanoparticles) to the surface of materials. The resulting high performance materials show improved chemical and physical properties and find widespread applications. The advantage of aryl diazonium salts compared to other surface modifiers lies in their ease of preparation, rapid (electro)reduction, large choice of reactive functional groups, and strong aryl-surface covalent bonding.This unique book summarizes the current knowledge of the surface and

  20. Derivatives of aryl-4-guanidinomethylbenzoate and N-aryl-4-guanidinomethylbenzamide as new antibacterial agents: synthesis and bioactivity

    Institute of Scientific and Technical Information of China (English)

    Wen-yuan YU; Li-xia YANG; Jian-shu XIE; Ling ZHOU; Xue-yuan JIANG; De-xu ZHU; Mutsumi MURAMATSU; Ming-wei WANG

    2008-01-01

    Aim: The aim of the present study was to design, synthesize, and evaluate novel antibacterial agents, derivatives of aryl-4-guanidinomethylbenzoate and N-aryl-4-guanidinomethylbenzamide. Methods: A total of 44 derivatives of aryl-4-guanidin-omethylbenzoate (series A) and N-aryl-4-guanidinomethylbenzamide (series B) were synthesized and their antibacterial activities were assessed in vitro against a variety of Gram-positive and Gram-negative bacteria by an agar dilution method. Results: Twelve compounds showed potent bactericidal effects against a panel of Gram-positive germs, including methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), vancomycin-intermediate Sta-phylococcus aureus (VISA), and methicillin-resistant coagulase-negative staphy-lococci (MRCNS), with minimum inhibitory concentrations (MIC) ranging be-tween 0.5 and 8 μg/mL, which were comparable to the MIC values of several marketed antibiotics. They exhibited weak or no activity on the Gram-negative bacteria tested. In addition, these compounds displayed high inhibitory activities towards oligopeptidase B of bacterial origin. Conclusion: In comparison with the previ-ously reported MIC values of several known antibiotics, the derivatives of aryl-4-guanidinomethylbenzoate and N-aryl-4-guanidinomethylbenzamide showed com-parable in vitro bactericidal activities against VRE and VISA as linezolid. Their growth inhibitory effects on MRSA were similar to vancomycin, but were less potent than linezolid and vancomycin against MRCNS. This class of compounds may have the potential to be developed into narrow spectrum antibacterial agents against certain drug-resistant strains of bacteria.

  1. The stability studies and in vitro hepatic microsomal metabolism of some alpha-phenyl-N-substituted nitrones in rats.

    Science.gov (United States)

    Bulut, Gülen; Oktav, Mehmet; Ulgen, Mert

    2004-01-01

    Nitrones are a very important class of synthetic chemicals as synthetic intermediates, antioxidant agents, and metabolic oxidation products of secondary amines and imines used drug, food, cosmetic and printing industry. In the present study, the stability experiments and in vitro metabolism studies using rat microsomal preparations fortified with NADPH were carried out using three different alpha-phenyl-N-substituted nitrones ie alpha-phenyl-N-tert-butylnitrone (PTBN), alpha-(2,6-dichlorophenyl)-N-phenylnitrone (DCPPN) and alpha-phenyl-N-adamantanylnitrone (PADN). The separation of these compounds from the potential degradation, isomerization and metabolic products were performed using a reverse phase HPLC system with a diodearray uv detection. Following stability experiments at 37 degrees C using methanolic nitrone solutions, it was observed that PTBN produced trace amounts of benzaldehyde and the corresponding amide. DCPPN also produced trace amounts of amide. After 12 hours, the amount of the amide significantly increased. PADN produced trace amount of benzaldehyde but not any amide. The proposed compounds were incubated with rat microsomal preparations fortified with NADPH, extracted into dichloromethane (DCM) and finally evaporated under nitrogen in the dark conditions. PTBN was metabolized into corresponding amide whereas DCPPN and PADN did not. With all of the substrates, the corresponding aldehydes are observed with both test and control tubes using denaturated microsomes and without co-factors.

  2. Novel Diarylethenes: N-Substituted-3, 4-bisheteroaryl-2, 5-dihydropyrrole

    Institute of Scientific and Technical Information of China (English)

    Yong HAN; Zhi Bin ZHANG; Jun Ping XIAO; Wen Peng YAN; Mei Gong FAN

    2005-01-01

    Novel diarylethene derivatives: N-substituted-3,4-bisheteroaryl-2,5-dihydropyrroles were synthesized through Mcmurry couple reaction with high yields. The photochromic properties and UV-Vis absorption spectra were studied. The maximal absorptions of their close forms were around at 406 nm or 446 nm, which related mainly with heteroaryl groups but not with substituted groups at nitrogen atom of dihydropyrrole. The absorption of their colored form could be matched with blue light laser.

  3. Characterizations of Some N-Substituted-salicylhydrazide in Mixtures by NMR Diffusion Ordered Spectroscopy

    Institute of Scientific and Technical Information of China (English)

    张芳; 于贤勇; 陈忠; 林深; 刘世雄

    2003-01-01

    Several novel N-substituted-salicylhydrazide ligands, most of which are difficult to be purified or recrystallized so that their chemical configurations can not be confirmed by conventional NMR and/or X-ray diffraction techniques, were synthesized in this experiment, and their chemical configurations in mixture were analyzed and characterized by 2D NMR diffusion ordered spectroscopy (DOSY), a labor-saving virtual separation based on diffusion properties,together with several routine NMR techniques.

  4. Pd-catalyzed carbonylative α-arylation of aryl bromides: scope and mechanistic studies.

    Science.gov (United States)

    Nielsen, Dennis U; Lescot, Camille; Gøgsig, Thomas M; Lindhardt, Anders T; Skrydstrup, Troels

    2013-12-23

    Reaction conditions for the three-component synthesis of aryl 1,3-diketones are reported applying the palladium-catalyzed carbonylative α-arylation of ketones with aryl bromides. The optimal conditions were found by using a catalytic system derived from [Pd(dba)2] (dba=dibenzylideneacetone) as the palladium source and 1,3-bis(diphenylphosphino)propane (DPPP) as the bidentate ligand. These transformations were run in the two-chamber reactor, COware, applying only 1.5 equivalents of carbon monoxide generated from the CO-releasing compound, 9-methylfluorene-9-carbonyl chloride (COgen). The methodology proved adaptable to a wide variety of aryl and heteroaryl bromides leading to a diverse range of aryl 1,3-diketones. A mechanistic investigation of this transformation relying on 31P and 13C NMR spectroscopy was undertaken to determine the possible catalytic pathway. Our results revealed that the combination of [Pd(dba)2] and DPPP was only reactive towards 4-bromoanisole in the presence of the sodium enolate of propiophenone suggesting that a [Pd(dppp)(enolate)] anion was initially generated before the oxidative-addition step. Subsequent CO insertion into an [Pd(Ar)(dppp)(enolate)] species provided the 1,3-diketone. These results indicate that a catalytic cycle, different from the classical carbonylation mechanism proposed by Heck, is operating. To investigate the effect of the dba ligand, the Pd0 precursor, [Pd(η3-1-PhC3H4)(η5-C5H5)], was examined. In the presence of DPPP, and in contrast to [Pd(dba)2], its oxidative addition with 4-bromoanisole occurred smoothly providing the [PdBr(Ar)(dppp)] complex. After treatment with CO, the acyl complex [Pd(CO)Br(Ar)(dppp)] was generated, however, its treatment with the sodium enolate led exclusively to the acylated enol in high yield. Nevertheless, the carbonylative α-arylation of 4-bromoanisole with either catalytic or stoichiometric [Pd(η3-1-PhC3H4)(η5-C5H5)] over a short reaction time, led to the 1,3-diketone product

  5. Antioxidant Functions of the Aryl Hydrocarbon Receptor

    Directory of Open Access Journals (Sweden)

    Cornelia Dietrich

    2016-01-01

    Full Text Available The aryl hydrocarbon receptor (AhR is a transcription factor belonging to the basic helix-loop-helix/PER-ARNT-SIM family. It is activated by a variety of ligands, such as environmental contaminants like polycyclic aromatic hydrocarbons or dioxins, but also by naturally occurring compounds and endogenous ligands. Binding of the ligand leads to dimerization of the AhR with aryl hydrocarbon receptor nuclear translocator (ARNT and transcriptional activation of several xenobiotic phase I and phase II metabolizing enzymes. It is generally accepted that the toxic responses of polycyclic aromatic hydrocarbons, dioxins, and structurally related compounds are mediated by activation of the AhR. A multitude of studies indicate that the AhR operates beyond xenobiotic metabolism and exerts pleiotropic functions. Increasing evidence points to a protective role of the AhR against carcinogenesis and oxidative stress. Herein, I will highlight data demonstrating a causal role of the AhR in the antioxidant response and present novel findings on potential AhR-mediated antioxidative mechanisms.

  6. One-pot synthesis of aryl sulfones from organometallic reagents and iodonium salts.

    Science.gov (United States)

    Margraf, Natalie; Manolikakes, Georg

    2015-03-06

    A transition-metal-free arylation of lithium, magnesium, and zinc sulfinates with diaryliodonium salts is described. The sulfinic acid salts were prepared from the reaction of the corresponding organometallic reagents and sulfur dioxide. Combination of the three single steps (preparation of the organometallic compound, sulfinate formation, and arylation) leads to a one-pot sequence for the synthesis of aryl sulfones from simple starting materials. The chemoselectivity of unsymmetrical diaryliodonium salts has been investigated. Potential and limitations of this method will be discussed.

  7. Microwave-assisted synthesis of α-aryl malonates: Key intermediates for the

    Directory of Open Access Journals (Sweden)

    Mohamed A. Ibrahim

    2016-11-01

    Full Text Available We disclose a new microwave-assisted protocol for the effective α-arylation of diethyl malonate. The coupling of aryl halides with diethyl malonate proceeds smoothly in short reaction time in the presence of a catalytic amount of Cu(OTf2, 2-picolinic acid and Cs2CO3 in toluene using microwave irradiation. The resulting α-aryl malonates are then used as key intermediates for synthesis of variety of heterocyclic compounds, including benzodiazepines, isoquinolines and pyrrolopyridine scaffolds.

  8. Biological activity of novel N-substituted amides of endo-3-(3-methylthio-1,2,4-triazol-5-yl)bicyclo[2.2.1]hept-5-ene-2-carboxylic acid and N-substituted amides of 1-(5-methylthio-1,2,4-triazol-3-yl)cyclohexane-2-carboxylic acids.

    Science.gov (United States)

    Pachuta-Stec, Anna; Kosikowska, Urszula; Chodkowska, Anna; Pitucha, Monika; Malm, Anna; Jagiełło-Wójtowicz, Ewa

    2012-01-01

    N-Substituted amides of endo-3-(3-methylthio-1,2,4-triazol-5-yl)bicyclo[2.2.1]hept-5-ene-2-carboxylic acid and 1-(5-methylthio-1,2,4-triazol-3-yl)cyclohexane-2-carboxylic acid were prepared by the condensation reaction of endo-S-methyl-N1-(bicyclo[2.2.1]hept-5-ene-2,3-dicarbonyl)isothiosemicarbazide and S-methyl-N1-(cyclohexane-2,3-dicarbonyl)isothiosemicarbazide with primary amines. The synthesized compounds were screened for their microbiological and pharmacological activities.

  9. Identification and expression of aryl hydrocarbon receptors (AhR1 and AhR2) provide insight in an evolutionary context regarding sensitivity of white sturgeon (Acipenser transmontanus) to dioxin-like compounds.

    Science.gov (United States)

    Doering, Jon A; Wiseman, Steve; Beitel, Shawn C; Giesy, John P; Hecker, Markus

    2014-05-01

    Sturgeons are ancient fishes, which are endangered in many parts of the world. Due to their benthic nature and longevity, sturgeon are at great risk of exposure to bioaccumulative contaminants such as dioxin-like compounds (DLCs). Despite their endangered status, little research has been conducted to characterize the relative sensitivity of sturgeons to DLCs. Proper assessment of risk of DLCs posed to these fishes therefore, requires a better understanding of this sensitivity and the factors that are driving it. Adverse effects associated with exposure to DLCs are mediated by the aryl hydrocarbon receptor (AhR). This study identified and characterized two distinct AhRs, AhR1 and AhR2, in white sturgeon (Acipenser transmontanus) for the first time as a first step in studying the relative sensitivities of sturgeons to DLCs. Furthermore, tissue-specific expression of both AhRs under basal conditions and in response to exposure to the model DLC, β-naphthoflavone (βNF), was determined. The sequence of amino acids of AhR1 of white sturgeon had greater similarity to AhRs of tetrapods, including amphibians, birds, and mammals, than to AhR1s of other fishes. The sequence of amino acids in the ligand binding domain of the AhR1 had greater than 80% similarity to AhRs known to bind DLCs and was less similar to AhRs not known to bind DLCs. AhR2 of white sturgeon had greatest similarity to AhR2 of other fishes. Profiles of expression of AhR1 and AhR2 in white sturgeon were distinct from those known in other fishes and appear more similar to profiles observed in birds. Expressions of both AhR1 and AhR2 of white sturgeon were greatest in liver and heart, which are target organs for DLCs. Furthermore, abundances of transcripts of AhR1 and AhR2 in all tissues from white sturgeon were greater than controls (up to 35-fold) following exposure to βNF. Based upon both AhRs having similar abundances of transcript in target organs of DLC toxicity, both AhRs being up-regulated following

  10. Synthesis of Novel 3-Aryl Isoindolinone Derivatives

    Institute of Scientific and Technical Information of China (English)

    HU Chen-ming; ZHENG Lian-you; PEI Ya-zhong; BAI Xu

    2013-01-01

    A library of novel 3-aryl isoindolinone derivatives with aromatic amino acid derivative fragments was designed and synthesized.Two synthetic routes were employed to construct 3-aryl isoindolinone ring system for different amino acid derivatives.

  11. Photoinduced C-C Cross-Coupling of Aryl Chlorides and Inert Arenes

    Directory of Open Access Journals (Sweden)

    Lele Wang

    2016-01-01

    Full Text Available Here we report a facile, efficient, and catalyst-free method to realize C-C cross-coupling of aryl chlorides and inert arenes under UV light irradiation. The aryl radical upon homolytic cleavage of C-Cl bond initiated the nucleophilic substitution reaction with inert arenes to give biaryl products. This mild reaction mode can also be applied to other synthetic reactions, such as the construction of C-N bonds and trifluoromethylated compounds.

  12. Synthesis of new N-substituted cyclic imides with an expected anxiolytic activity. XXII. Derivatives of 1-methoxy-5-bicyclo[2.2.2]-oct-5-one-2,3-dicarboximide.

    Science.gov (United States)

    Kossakowski, Jerzy; Jarocka-Wierzba, Monika

    2003-01-01

    Continuing our studies with the design of new anxiolytics we have now synthesized a series of new compounds, derivatives of 1-methoxybicyclo[2.2.2]-oct-5-one-2,3-dicarboximide bearing a 4-aryl-1-piperazinylbutyl group attached to the imide nitrogen.

  13. Kinetics and thermodynamics of peroxidase- and laccase-catalyzed oxidation of N-substituted phenothiazines and phenoxazines.

    Science.gov (United States)

    Kulys, J; Krikstopaitis, K; Ziemys, A

    2000-06-01

    Steady-state and single-turnover kinetics for the oxidation of the N-substituted phenothiazines (PTs) and phenoxazines (POs) catalyzed by fungal Coprinus cinereus peroxidase and Polyporus pinsitus laccase were investigated at pH 4-10. In the case of peroxidase, an apparent bimolecular rate constant (expressed as k(cat)/K(m)) varied from 1 x10(7)M(-1)s(-1) to 2.6 x 108 M(-1)s(-1) at pH 7.0. The constants for PO oxidation were higher in comparison to PT. pH dependence revealed two or three ionizable groups with pKa values of 4.9-5.7 and 7.7-9.7 that significantly affected the activity of peroxidase. Single-turnover experiments showed that the limiting step of PT oxidation was reduction of compound II and second-order rate constants were obtained which were consistent with the constants at steady-state conditions. Laccase-catalyzed PT and PO oxidation rates were lower; apparent bimolecular rate constants varied from 1.8x 10(5) M(-1) s(-1) to 2.0 x 10(7) M(-1) s(-1) at pH 5.3. PO constants were higher in comparison to PT, as was the case with peroxidase. The dependence of the apparent bimolecular constants of compound II or copper type 1 reduction, in the case of peroxidase or laccase, respectively, was analyzed in the framework of the Marcus outer-sphere electron-transfer theory. Peroxidase-catalyzed reactions with PT, as well as PO, fitted the same hyperbolic dependence with a maximal oxidation rate of 1.6 x 10(8)M(-1)s(-1) and a reorganization energy of 0.30 eV. The respective parameters for laccase were 5.0 x 10(7) M(-1) s(-1) and 0.29 eV.

  14. Antileishmanial, antimicrobial and antifungal activities of some new aryl azomethines.

    Science.gov (United States)

    Al-Kahraman, Yasser M S A; Madkour, Hassan M F; Ali, Dildar; Yasinzai, Masoom

    2010-01-28

    A series of eighteen azomethines has been synthesized by the reaction of appropriate primary aromatic amines with aryl and/or heteroaryl carboxaldehydes. The synthesized azomethines have been evaluated for their in vitro antileishmanial, antibacterial and antifungal activities. The results revealed some antifungal activity of most of the synthesized compounds, whereas the antileishmaniasis activity results highlighted that all synthesized azomethines inhibited parasite growth and most of them showed highly potent action towards Leishmania major promastigotes. No remarkable bactericidal activities were observed.

  15. Some higher N-substituted 1,3-thiazolidine-2,4-diones and 5,5-diphenylhydantoins, their synthesis and corrosion preventive properties in mineral oil medium

    Energy Technology Data Exchange (ETDEWEB)

    Oeztuerk, Serkan, E-mail: serkanozturk@uludag.edu.tr [Department of Chemistry, Faculty of Science and Arts, Uludag University, 16059 Bursa (Turkey); Y Latin-Small-Letter-Dotless-I ld Latin-Small-Letter-Dotless-I r Latin-Small-Letter-Dotless-I m, Ayhan; Cetin, Mehmet [Department of Chemistry, Faculty of Science and Arts, Uludag University, 16059 Bursa (Turkey)

    2013-01-15

    Highlights: Black-Right-Pointing-Pointer N-substituted 5,5-diphenylhydantoins and 1,3-thiazolidine-2,4-diones were prepared. Black-Right-Pointing-Pointer All synthesized compounds showed good inhibition effect in oil-water medium. Black-Right-Pointing-Pointer The test results were supported with water contact angle measurements and with SEM. Black-Right-Pointing-Pointer Inhibition effect of compounds were evidenced by the optical profilometer photos. - Abstract: Some five membered heterocyclic compounds were synthesized by the reaction of 2,4-thiazolidinedione or 5,5-diphenylhydantoin potassium salts with 2-chloro-N-alkylacetamides and alkyl-2-chloroacetates. The structure confirmations of the synthesized compounds were performed by FT-IR, {sup 1}H NMR, {sup 13}C NMR spectra. The inhibitory effectiveness of the compounds were evaluated against the corrosion of steel strip immersed in water containing paraffin based mineral oil medium in accordance to standard test method. Surface characterization studies of the metal coupons used were performed by SEM analysis and also by the contact angle measurements using the Sessile-Drop method. In addition the 3D image of the metal surface was obtained using optical profilometer. The test results and surface characterization studies showed that all synthesized compounds are excellent corrosion inhibitors in such a water in oil emulsion system.

  16. Recent Advancements and Biological Activities of Aryl Propionic Acid Derivatives: (A Review

    Directory of Open Access Journals (Sweden)

    Harshita Dhall

    2016-08-01

    Full Text Available The aryl propionic acid derivatives belong to an important class of NSAIDs (Non Steroidal Anti-inflammatory Drugs. Ibuprofen, chemically called 2-(4-isobutyl phenyl propionic acid, is a well known NSAID. Aryl propionic acid derivatives possesses a wide range of biological activities including anti-bacterial, anti-convulsant, anti-cancer, analgesic and anti-inflammatory activities. Apart from very potent compounds in the field of analgesics and antipyrectics as Ibuprofen, Oxaprozin, Ketoprofen, Fenoprofen; aryl propionic acid derivatives plays important role to treat other ailments also. Through this review, an attempt has been made to emphasize on recent work done and recent advancements in arena of aryl propionic acid derivatives in view of medicinal chemistry.

  17. A new class of anticonvulsants possessing 6 Hz psychomotor seizure test activity: 2-(1H-benzotriazol-1-yl)-N'-[substituted] acetohydrazides.

    Science.gov (United States)

    Kumar, Praveen; Tripathi, Laxmi

    2012-05-01

    A series of 2-(1H-Benzotriazol-1-yl)-N'-[substituted]acetohydrazides were designed & synthesized keeping in view the structural requirement of pharmacophore and evaluated for anticonvulsant activity and neurotoxicity. The new compounds were characterized using FT-IR, 1H NMR, mass spectral data and elemental analysis. The anticonvulsant activity of the titled compounds was assessed using the 6 Hz psychomotor seizure test. The neurotoxicity was assessed using the rotorod method. The most active compound of the series was N'-[4-(1,3-Benzodioxol-5-yloxy)benzylidene]-2-(1H-benzotriazol-1-yl)acetohydrazide (BTA 9), which showed good activity with 75 % protection (3/4, 0.5 h) at a dose of 100 mg/kg in mice. All the compounds exhibited no neurotoxicity. A computational study was carried out for calculation of pharmacophore pattern and prediction of pharmacokinetic properties. Titled compounds have also exhibited good binding properties with epilepsy molecular targets such as glutamate, GABA (A) delta, GABA (A) alpha-1 receptors and Na/H exchanger, in Lamarckian genetic algorithm based flexible docking studies.

  18. Efficient synthesis of π-conjugated molecules incorporating fluorinated phenylene units through palladium-catalyzed iterative C(sp2–H bond arylations

    Directory of Open Access Journals (Sweden)

    Fatiha Abdelmalek

    2015-10-01

    Full Text Available We report herein a two or three step synthesis of fluorinated π-conjugated oligomers through iterative C–H bond arylations. Palladium-catalyzed desulfitative arylation of heteroarenes allowed in a first step the synthesis of fluoroaryl-heteroarene units in high yields. Then, the next steps involve direct arylation with aryl bromides catalyzed by PdCl(C3H5(dppb to afford triad or tetrad heteroaromatic compounds via regioselective activation of C(sp2–H bonds.

  19. Green and selective synthesis of N-substituted amides using water soluble porphyrazinato copper(II) catalyst

    Energy Technology Data Exchange (ETDEWEB)

    Ghodsinia, Sara S.E.; Akhlaghinia, Batool; Eshghi, Hossein, E-mail: akhlaghinia@um.ac.ir [Ferdowsi University of Mashhad (Iran, Islamic Republic of). Faculty of Sciences. Department of Chemistry; Safaei, Elham [Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan (Iran, Islamic Republic of). Department of Chemistry

    2013-06-15

    N, N',N{sup ,} N{sup '}-Tetramethyl tetra-2,3-pyridinoporphyrazinato copper(II) methyl sulfate ([Cu(2,3-tmtppa)](MeSO{sub 4}){sub 4}) efficiently catalyzed the direct conversion of nitriles to N-substituted amides. The one pot selective synthesis of the N-substituted amides from nitriles and primary amines was performed in refluxing H{sub 2}O. The catalyst was recovered and reused at least four times, maintaining its efficiency. (author)

  20. Room-Temperature Palladium-Catalyzed Direct 2-Arylation of Benzoxazoles with Aryl and Heteroaryl Bromides†

    Science.gov (United States)

    Gao, Feng; Kim, Byeong-Seon; Walsh, Patrick J.

    2014-01-01

    An efficient room-temperature palladium-catalyzed direct 2-arylation of benzoxazoles with aryl bromides is presented. The Pd(OAc)2/NiXantphos-based catalyst enables the introduction of various aryl and heteroaryl groups, via a deprotonative cross-coupling process (DCCP) in good to excellent yields (75–99%). PMID:25078988

  1. 3-methylcholanthrene induces differential recruitment of aryl hydrocarbon receptor to human promoters

    DEFF Research Database (Denmark)

    Pansoy, Andrea; Ahmed, Shaimaa; Valen, Eivind;

    2010-01-01

    The aryl hydrocarbon receptor (AHR) is a ligand-activated protein that mediates the toxic actions of polycyclic aromatic and halogenated compounds. Identifying genes directly regulated by AHR is important in understanding the pathways regulated by this receptor. Here we used chromatin immunopreci......The aryl hydrocarbon receptor (AHR) is a ligand-activated protein that mediates the toxic actions of polycyclic aromatic and halogenated compounds. Identifying genes directly regulated by AHR is important in understanding the pathways regulated by this receptor. Here we used chromatin...

  2. Metal-free arylation of ethyl acetoacetate with hypervalent diaryliodonium salts: an immediate access to diverse 3-aryl-4(1H)-quinolones.

    Science.gov (United States)

    Monastyrskyi, Andrii; Namelikonda, Niranjan K; Manetsch, Roman

    2015-03-06

    A clean arylation protocol of ethyl acetoacetate was developed using hypervalent diaryliodonium salts under mild and metal-free conditions. The scope of the reaction, using symmetric and unsymmetric iodonium salts with varying sterics and electronics, was examined. Further, this method has been applied for the synthesis of antimalarial compound ELQ-300, which is currently in preclinical development.

  3. Antibacterial and Enzyme Inhibition Studies of N'-Substituted Benzylidene-2-(2, 4-Dimethylphenoxy Acetatohydrazides

    Directory of Open Access Journals (Sweden)

    1S. Nadeem

    2014-09-01

    Full Text Available The molecules bearing azomethine group are known to possess biological activities. In the present work, the synthesis of N'-Substitutedbenzylidene-2-(2, 4-dimethylphenoxy acetatohydrazide (5a-d has been elaborated using 2,4-Dimethylphenol (1 as precursor. The molecule, 1, was converted to ethyl 2-(2,4-dimethylphenoxyacetate (2 on refluxing with ethyl 2-bromoacetate in ethanol in the presence of KOH. Ethyl ester, 2, was refluxed with hydrated hydrazine (80% in ethanol to yield 2-(2,4-dimethylphenoxy acetohydrazide (3. The target molecules, 5a-d, were synthesized by stirring 3 with phenyl/aryl carboxaldehyde (4a-d in methanol in the presence of glacial acetic acid. The synthesized molecules were characterized by spectral data and evaluated for antibacterial and anti-enzymatic activities.

  4. Heteropoly acids of the Keggin type with N-substitutedβ-amminoethylphosphonic acids as coordinate center

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Organophosphorus-heteropolytungstic acids of 1 : 12 of P/W ratio, with N-substituted 2-amminoethylphosphonic acids R2R'N+CH2CH2PO3H-(R = R' = H; R = Me, R' = H; R = R' = Me;R = H, R' = Me2CH; R = H, R' = CH3(CH2)2CH2) as coordinate centers were prepared, and char-acterized by means of elemental analysis, IR, UV spectroscopy, TG and DSC thermal analysis.The results indicate that these organophosphorous-HPAs possess Keggin type structure, and theirstoichiometric formulation is R2R'N+CH2CH2PO3H-·W12O36 ·nH2O. The organic side chain with theammino-group R2R'N+CH2CH2-and the phosphono-group-PO3H-participate altogether in the for-mation of the primary structure of the heteropoly anion. In other words, the entirety of eachcompound R2R'N+CH2CH2PO3H-is as the core or coordinate center of the heteropoly anions. Thenumber of crystal water in the HPA was affected obviously by the N-substituents of the organo-phosphonic acids.

  5. Radioimmunoassay for anileridine, meperidine, and other N-substituted phenylpiperidine carboxylic acid esters

    Energy Technology Data Exchange (ETDEWEB)

    Van Vunakis, H.; Freeman, D.S.; Gjika, H.B.

    1975-10-01

    Antibodies that bind an /sup 125/I-tyramyl derivative of N-succinylanileridine have been produced in animals immunized with N-succinylanileridine-hemocyanin conjugate. Several congeners and metabolites have been tested as competitors of this antigen-antibody reaction. The concentrations (in picomoles) required for 50 percent inhibition have been found to be: anileridine (0.2), meperidine (3.5), piminodine (3.8), diphenoxylate (20.5), normeperidine (20.0), meperidine acid (45,000) and anileridine acid (3,400). Although ester hydrolysis results in changes in inhibiting capacities on the order of 10/sup 4/, major structural changes in the substituent on the nitrogen of the piperidine ring are not readily recognized by the antibody. This radioimmunoassay can be used to study a variety of N-substituted phenylpiperidine carboxylic acid esters by relating the results to the standard curve obtained for the drug under investigation. For all practical purposes, alphaprodine, morphine and methadone do not interfere with the assay.

  6. N-Substituted Glutamyl Sulfonamides As Inhibitors Of Glutamate Carboxypeptidase II (GCP2)

    Science.gov (United States)

    Blank, Brian R.; Alayoglu, Pinar; Engen, William; Choi, Joseph K.; Berkman, Clifford E.; Anderson, Marc O.

    2011-01-01

    Glutamate carboxypeptidase II (GCP2) is a membrane-bound cell-surface peptidase which is implicated in several neurological disorders, and is also over-expressed in prostate tumor cells. There is significant interest in the inhibition of GCP2 as a means of neuroprotection, while GCP2 inhibition as a method to treat prostate cancer remains a topic of further investigation. The key zinc-binding functional group of the well characterized classes of GCP2 inhibitors (phophonates and phosphoramidates) is tetrahedral and negatively charged at neutral pH, while glutamyl urea class of inhibitors possess a planar and neutral zinc-binding group. This study introduces a new class of GCP2 inhibitors, N-substituted glutamyl sulfonamides, which possess a neutral tetrahedral zinc-binding motif. A library containing 15 secondary sulfonamides and 4 tertiary (N-methyl) sulfonamides was prepared and evaluated for inhibitory potency against purified GCP2 enzyme activity. While most inhibitors lacked potency at 100 μM, short alkyl sulfonamides exhibited promising low micromolar potency, with the optimal inhibitor in this series being glutamyl N-propylsulfonamide (2g). Lastly, molecular docking was used to develop a model to formulate an explanation for the relative inhibitory potencies employed for this class of inhibitors. PMID:21219587

  7. A new acylamidase from Rhodococcus erythropolis TA37 can hydrolyze N-substituted amides.

    Science.gov (United States)

    Lavrov, K V; Zalunin, I A; Kotlova, E K; Yanenko, A S

    2010-08-01

    A new acylamidase was isolated from Rhodococcus erythropolis TA37 and characterized. N-Substituted acrylamides (isopropyl acrylamide, N,N-dimethyl-aminopropyl acrylamide, and methylene-bis-acrylamide), acid para-nitroanilides (4'-nitroacetanilide, Gly-pNA, Ala-pNA, Leu-pNA), and N-acetyl derivatives of glycine, alanine, and leucine are good substrates for this enzyme. Aliphatic amides (acetamide, acrylamide, isobutyramide, n-butyramide, and valeramide) are also used as substrates but with less efficiency. The enzyme subunit mass by SDS-PAGE is 55 kDa. Maximal activity is exhibited at pH 7-8 and 55°C. The enzyme is stable for 15 h at 22°C and for 0.5 h at 45°C. The Michaelis constant (K(m)) is 0.25 mM with Gly-pNA and 0.55 mM with Ala-pNA. The acylamidase activity is suppressed by inhibitors of serine proteases (phenylmethylsulfonyl fluoride and diisopropyl fluorophosphate) but is not suppressed by inhibitors of aliphatic amidases (acetaldehyde and nitrophenyl disulfides). The N-terminal amino acid sequence of the acylamidase is highly homologous to those of two putative amidases detected from sequenced R. erythropolis genomes. It is suggested that the acylamidase together with the detected homologs forms a new class within the amidase signature family.

  8. Mild synthesis of N'-aryl-N,N-dimethylformamidinium chloride by Vilsmeier-Haack reagent

    Institute of Scientific and Technical Information of China (English)

    Ge Meng; Yao Wu Sha; Rui Zhang; Nan Bai

    2011-01-01

    Formamidine derivatives could be used as the building blocks for substituted heterocyclic compounds with various biological activities. N'-Aryl-N,N-dimethylformamidinium chlorides have been synthesized in high yields by reaction of aromatic primary amines with Vilsmeier-Haack reagent at room temperature. The structures of all the new compounds were identified by ESI-MS, IR and NMR spectra. The steric structures of some of these compounds were clarified by X-ray single crystal analysis.

  9. Synthesis of new N-substituted cyclic imides with an expected anxiolytic activity. XVI. Derivatives of 1-acetoxy-7,7-dimethylbicyclo[2.2.2]octan-5-one-2,3-dicarboximide.

    Science.gov (United States)

    Kossakowski, Jerzy; Hejchman, Elzbieta

    2003-01-01

    The preparation of a potential anxiety-relieving compounds N-[4-(4-aryl)-1-piperazinyl)butyl]-1-acetoxy-7,7-dimethyl-bicyclo[2.2.2]octan-5-one-2,3-dicarboximides has been described. N-[4-(4-2-methoxyphenyl)-1-piperazinyl)butyl]-1-acetoxy-7,7-dimethyl-bicyclo[2.2.2]octan-5-one-2,3-dicarboximide III showed a strong sedative effect in Writh's test.

  10. Regioselective synthesis and biological studies of novel 1-aryl-3, 5-bis (het) aryl pyrazole derivatives as potential antiproliferative agents.

    Science.gov (United States)

    Ananda, Hanumappa; Sharath Kumar, Kothanahally S; Nishana, Mayilaadumveettil; Hegde, Mahesh; Srivastava, Mrinal; Byregowda, Raghava; Choudhary, Bibha; Raghavan, Sathees C; Rangappa, Kanchugarakoppal S

    2017-02-01

    Pyrazole moiety represents an important category of heterocyclic compound in pharmaceutical and medicinal chemistry. The novel 1-aryl-3, 5-bis (het) aryl pyrazole derivatives were synthesized with complementary regioselectivity. The chemical structures were confirmed by IR, (1)H NMR, (13)C NMR, and mass spectral analysis. The chemical entities were screened in various cancer cell lines to assess their cell viability activity. Results showed that the compound 3-(1-(4-bromophenyl)-5-phenyl-1H-pyrazol-3-yl) pyridine (5d) possessed maximum cytotoxic effect against breast cancer and leukemic cells. The cytotoxicity was confirmed by live-dead cell assay and cell cycle analysis. Mitochondrial membrane potential, Annexin V-FITC staining, DNA fragmentation, Hoechst staining, and western blot assays revealed the ability of compound 5d to induce cell death by activating apoptosis in cancer cells. Thus, the present study demonstrates that compound 5d could be an attractive chemical entity for the development of small molecule inhibitors for treatment of leukemia and breast cancer.

  11. A Convenient Synthesis of 2-Aryl-3-per(poly)fluoroacylindoles

    Institute of Scientific and Technical Information of China (English)

    LIU,Jin-Tao(刘金涛); L(U),He-Jun(吕贺军)

    2002-01-01

    2-Aryl-3-per(poly) fluoroacylindoles were synthesized in good yields by the 1,3-dipolar cycloddition reaction of C-aryi-Nphenylnitrones with fluorine-containing olefins and the subsequent rearrangement of the adducts. An ionic mechanism was proposed for the formtion of the titled compounds.

  12. Studies on Aryl-Substituted Phenylalanines: Synthesis, Activity, and Different Binding Modes at AMPA Receptors

    DEFF Research Database (Denmark)

    Szymanska, Ewa; Frydenvang, Karla Andrea; Pickering, Darryl S;

    2016-01-01

    A series of racemic aryl-substituted phenylalanines was synthesized and evaluated in vitro at recombinant rat GluA1−3, at GluK1−3, and at native AMPA receptors. The individual enantiomers of two target compounds, (RS)-2-amino-3-(3,4-dichloro-5-(5-hydroxypyridin-3-yl)phenyl)- propanoic acid (37...

  13. An Efficient Solid-State Synthesis of N-Aryl-2-phenyldiazenecarboxamides

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    A new and efficient solid-state reaction using K3Fe(CN)6/KOH to oxidize diaryl semicarbazides for preparing azo compounds has been reported. Nine N-aryl-2-phenyl-diazenecarboxamides have been synthesized in excellent yields with simple instrument.

  14. Synthesis and Biological Evaluation of Novel Aryl-2H-pyrazole Derivatives as Potent Non-purine Xanthine Oxidase Inhibitors.

    Science.gov (United States)

    Sun, Zhi-Gang; Zhou, Xiao-Jing; Zhu, Ming-Li; Ding, Wen-Ze; Li, Zhen; Zhu, Hai-Liang

    2015-01-01

    A series of aryl-2H-pyrazole derivatives were synthesized and evaluated for inhibitory activity against xanthine oxidase in vitro as potent xanthine oxidase inhibitors. Among them, 2 aryl-2H-pyrazole derivatives showed significant inhibitory activities against xanthine oxidase. Compound 19 emerged as the most potent xanthine oxidase inhibitor (IC50=9.8 µM) in comparison with allopurinol (IC50=9.5 µM). The docking study revealed that compound 19 might have strong interactions with the active site of xanthine oxidase. This compound is thus a new candidate for further development for the treatment of gout.

  15. Novel Synthesis and Anti-HIV-1 Activity of 2-Arylthio-6-benzyl-2,3-dihydro-1H-pyrimidin-4-ones (Aryl S-DABOs)

    DEFF Research Database (Denmark)

    Aly, Youssef L.; Pedersen, Erik Bjerreg.; La Colla, Paolo;

    2007-01-01

    The synthesis and the anti-HIV-1 activity of a series of 2-arylthio-6-benzyl-2,3-dihydro-1H-pyrimidin-4-ones (aryl S-DABOs) are reported. These compounds were synthesized via a coupling reaction of the corresponding 6-benzyl-2-thiouracils with aryl iodides in the presence of neocuproine hydrate......, copper(I) iodide, and sodium tert-butoxide. Target compounds showed moderate activity against HIV-1....

  16. SYNTHESIS AND ANTIMICROBIAL EVALUATION OF 2-(4-FLUORO BENZYLTHIO-N-(SUBSTITUTED PHENYLPYRIMIDINE-4-AMINES

    Directory of Open Access Journals (Sweden)

    N.M. Goudgaon*, Y. Rohini Reddy and B.U. Sheshikant

    2013-11-01

    Full Text Available Reaction of 4-fluorobenzylchloride with 2-thiouracil (1 gave 2-(4-fluorobenzylthiopyrimidin-4(3H-one (2, which on chlorination with POCl3 furnished 4-chloro-2-(4-fluorobenzylthio-4-chloropyrimidine (3. This intermediate when treated with various substituted anilines gave desired targeted compounds 4(a-k in 50-90% yield. Structural assignments of the synthesized compounds were based on their IR, 1H NMR, Mass and analytical data. The antimicrobial evaluation of newly synthesized compounds was carried out by cup-plate method. The investigation of antimicrobial screening reveals that the compounds 4b, 4g, 4c and 4f showed good activity against bacterial strain B. subtilis. Compounds 4a, 4e, 4b, 4c, 4f, 4g and 4h were active against bacterial strain P. aeruginosa. Compounds 4a and 4c were active against fungul strain A. niger. Compounds 4e, 4b and 4j showed good activity against fungal strain A. flavus. All the synthesized compounds showed excellent antifungal activity against T.viridae. Remaining compounds exhibited moderate to poor activity against bacterial and fungal strains when compared to standard drugs Gentamycin and Fluconazole respectively. So, further we have carried out the antifungal screening of all the synthesized compounds at different concentrations against T. viridae to determine their IC50 values. Compounds 4e, 4b, 4g, 4i, 4d, 4f and 4j have shown better IC50 values.

  17. Antileishmanial, Antimicrobial and Antifungal Activities of Some New Aryl Azomethines

    Directory of Open Access Journals (Sweden)

    Masoom Yasinzai

    2010-01-01

    Full Text Available A series of eighteen azomethines has been synthesized by the reaction of appropriate primary aromatic amines with aryl and/or heteroaryl carboxaldehydes. The synthesized azomethines have been evaluated for their in vitro antileishmanial, antibacterial and antifungal activities. The results revealed some antifungal activity of most of the synthesized compounds, whereas the antileishmaniasis activity results highlighted that all synthesized azomethines inhibited parasite growth and most of them showed highly potent action towards Leishmania major promastigotes. No remarkable bactericidal activities were observed.

  18. Direct bis-arylation of cyclobutanecarboxamide via double C-H activation: an auxiliary-aided diastereoselective Pd-catalyzed access to trisubstituted cyclobutane scaffolds having three contiguous stereocenters and an all-cis stereochemistry.

    Science.gov (United States)

    Parella, Ramarao; Gopalakrishnan, Bojan; Babu, Srinivasarao Arulananda

    2013-12-06

    An auxiliary-aided Pd-catalyzed highly diastereoselective double C-H activation and direct bis-arylation of methylene C(sp(3))-H bonds of cyclobutanecarboxamides and the syntheses of several novel trisubstituted cyclobutanecarboxamide scaffolds having an all-cis stereochemistry are reported. Extensive screening of various auxiliaries and reaction conditions was performed to firmly establish the optimized reaction conditions required for effecting the mono- or double C-H arylation of cyclobutanecarboxamides. The auxiliary-attached cyclobutanecarboxamides 15a, 15g, and 15h, prepared from the auxiliaries such as, 8-aminoquinoline, 2-(methylthio)aniline, and N',N'-dimethylethane-1,2-diamine were found to undergo an efficient direct bis-arylation. The Pd-catalyzed arylation reaction of N-(quinolin-8-yl)cyclobutanecarboxamide 15a with one equivalent or more of aryl iodides, afforded the corresponding bis-arylated cyclobutanecarboxamides 16a-y. Nevertheless, the Pd-catalyzed arylation of 15a with just 0.5 equiv of the aryl iodides 13a, 13b, 13e, and 13m, selectively gave the corresponding monoarylated cyclobutanecarboxamides 17a-17d. The Pd-catalyzed arylation of 15g or 15h with one equivalent or more of aryl iodides afforded the bis-arylated cyclobutanecarboxamides 19a-19c and 21a-21m, respectively. However, the Pd-catalyzed arylations of compounds 15g or 15h with just 0.5 equiv of aryl iodides were ineffective. The stereochemistry of compounds obtained in this work was unambiguously assigned from the X-ray structures of representative products.

  19. Synthesis and antifungal activity of novel (1-aryl-2-heterocyclyl)ethylideneaminooxymethyl-substituted dioxolanes

    Energy Technology Data Exchange (ETDEWEB)

    Baji, H.; Flammang, M.; Kimny, T.; Gasquez, F.; Compagnon, P.L.; Delcourt, A. [Dijon Univ., 21 (France)

    1995-12-31

    A novel series of (1-aryl-2-heterocyclyl)ethylideneaminooxymethyl -substituted dioxolanes IIIa-n were synthesized by condensation of substituted 1,3-dioxolan-4-ylmethyl p-toluenesulfonates 4 with 1-(hydroxyimino)-1-aryl-2-heterocyclylethanes 5. Compounds IIIa-n were found to have effective in vitro antifungal activity when evaluated against the pathogenic fungi Candida albicans, Aspergillus flavus and Fusarium solani with MIC (minimum inhibitory concentration) values of 10 {mu}g-ml{sup -1} for IIIa-I and 5 {mu}g-ml{sup -1} for IIIm,n. (authors). 24 refs., 4 figs., 5 tabs.

  20. Comparative study of spectroscopic properties of the low-lying electronic states of 2,4-pentadien-1-iminium cation and its N-substituted analogues

    Indian Academy of Sciences (India)

    Anjan Chattopadhyay

    2012-09-01

    Semiempirical and ab initio-based CI methods have been employed to study the low-lying electronic states of 2,4-pentadien-1-iminium cation and its N-substituted analogues with electron-donating (methyl, isopropyl) and electron-withdrawing (fluoromethyl) groups on nitrogen. Variations of the dihedral angles (Γ3, Γ4) of the ground state have given the global minima and global maxima at (180°, 180°) and (90°, 0°) conformations, respectively, with some exceptions in the case of fluoromethyl compound. Increase in the +I effect on nitrogen shifts the TICT conical intersection point away from the 90° (Γ3 dihedral angle) value, when the Γ4 value is kept fixed at 180°. Transition moment values of the allowed S0(1A -like) → S1 (2B-like) transitions are expectedly higher than the forbidden S0(1A -like) → S2(2A -like) transitions by almost 5.6 D. Radiative lifetime values of the first excited states are calculated to be around 215 ps for all the four compounds. At (180°, 180°) conformation the vertical excitation energy (VEE) between the S0 and S1 states of the 2,4-pentadieniminium cation is found to be 3.3 eV, which corresponds to the absorption wavelength value of roughly 375 nm. The VEE value increases with substituents having +I effect on nitrogen, while for the fluoromethyl compound it is calculated to be around 2.85 eV. The energy gap between the first two excited singlet states is found to have the least value in the isopropyl-substituted compound, where the S2 state contains a huge contribution from the HOMO2→LUMO2 configuration.

  1. 2-(Hetero(aryl)methylene)hydrazine-1-carbothioamides as potent urease inhibitors.

    Science.gov (United States)

    Saeed, Aamer; Imran, Aqeel; Channar, Pervaiz A; Shahid, Mohammad; Mahmood, Wajahat; Iqbal, Jamshed

    2015-02-01

    A small series of 2-(hetero(aryl)methylene) hydrazine-1-carbothioamides including two aryl derivatives was synthesized and tested for their inhibitory activity against urease. Compound (E)-2-(Furan-2-ylmethylene) hydrazine-1-carbothioamide (3f), having a furan ring, was the most potent inhibitor of urease with an IC50 value of 0.58 μM. Molecular modeling was carried out through docking the designed compounds into the urease binding site to predict whether these derivatives have analogous binding mode to the urease inhibitors. The study revealed that all of the tested compounds bind with both metal atoms at the active site of the enzyme. The aromatic ring of the compounds forms ionic interactions with the residues, Ala(440), Asp(494), Ala(636), and Met(637).

  2. Microwave Assisted Synthesis of N-Aryl-N'-[5-(4- Chlorophenyl)-2-Furoyl]-Thioureas And Ureas

    Institute of Scientific and Technical Information of China (English)

    WANG; XiCun

    2001-01-01

    Substituted thioureas have attracted much attention due to their herbicidal1, antibacterial2, anti-HIV3 and plant-growth regulating4 activity. Meanwhile substituted ureas are not only used as medicines and agrochemicals because of their antiinflammatory5, analgesic5 and insectcidal6 activity, but also used as intermediates for the synthesis of many important heterocyclic compounds. In addition, 5-aryl-2-furoic acid derivatives have been used as antibacterial agent7, local anesthesia8, analgesic9 and plant-growth regulator10. Therefore, with the objective of obtaining new biologically active compounds, it is necessary to investigate the convenient and efficient method to prepare new compounds bearing 5-aryl-2-furoyl and thiourea or 5-aryl-2-furoyl and urea moieties.  ……

  3. Syntheses and Antibacterial Studies of Some 1-Phenyl-3-(4-(2-ethanoloxy phenyl-5-aryl-1H-pyrazoles

    Directory of Open Access Journals (Sweden)

    Anju Goyal

    2013-01-01

    Full Text Available A series of 1-phenyl-3-(4-(2-ethanoloxy phenyl-5-aryl-1H-pyrazoles were synthesized from chalcones, that is, 3-aryl-1-(4-hydroxyphenyl prop-2-en-1-ones and studied for their in vitro antibacterial activity. Chalcones 1 on reaction with phenyl hydrazine in the presence of acetic acid and few drops of hydrochloric acid yielded the corresponding 1-phenyl-3-(4-hydroxyphenyl-5-aryl-1H-pyrazoles 2 which on further reaction with 2-chloroethanol furnished the title compounds 3. These compounds were characterized by CHN analyses, IR, mass and 1H NMR spectral data. All the compounds were evaluated for their in vitro antibacterial activity against two Gram positive strains (Bacillus subtilis and Staphylococcus aureus and two Gram negative strains (Escherichia coli and Pseudomonas aeruginosa, and their minimum inhibitory concentration (MIC was determined.

  4. Microwave Assisted Synthesis of N-Aryl-N'-[5-(4- Chlorophenyl)-2-Furoyl]-Thioureas And Ureas

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@ Substituted thioureas have attracted much attention due to their herbicidal1, antibacterial2, anti-HIV3 and plant-growth regulating4 activity. Meanwhile substituted ureas are not only used as medicines and agrochemicals because of their antiinflammatory5, analgesic5 and insectcidal6 activity, but also used as intermediates for the synthesis of many important heterocyclic compounds. In addition, 5-aryl-2-furoic acid derivatives have been used as antibacterial agent7, local anesthesia8, analgesic9 and plant-growth regulator10. Therefore, with the objective of obtaining new biologically active compounds, it is necessary to investigate the convenient and efficient method to prepare new compounds bearing 5-aryl-2-furoyl and thiourea or 5-aryl-2-furoyl and urea moieties.

  5. Synthesis, Characterization and Biological Activities of N-Acyl-3-(3-pyridyl)-5-aryl-pyrazoles

    Institute of Scientific and Technical Information of China (English)

    KANG Yan-fang; WANG Dun-jia; XU Ben-po; WEI Xian-hong; ZHENG Jing

    2013-01-01

    Ten novel N-acyl-3-(3-pyridyl)-5-aryl-pyrazoles were synthesized by Claisen condensation of the aryl methyl ketones with ethyl nicotinate,the cyclization with hydrazine hydrate and the N-acylation with acyl chloride in turn.The structures of all the compounds synthesized were confirmed by means of Fourier transform infrared(FTIR),1H NMR,mass spectroscopy and elemental analysis.The biological activities of the title compounds were examined by disc diffusion method against Escherichia coli,Staphylococcus aureus,Pyricularia oryzae and Rhizoctnia solani.All the N-acyl-3-(3-pyridyl)-5-aryl-pyrazoles exhibited a certain degree of antibacterial and antifungal activities.Comparatively,compounds 3c and 3d exhibited much significant antibacterial and antifungal activities than the other pyrazole derivatives.

  6. Synthesis and dynamic stereochemistry of 4-aryl-thiomorpholine-3,5-dione derivatives

    Science.gov (United States)

    Szawkało, Joanna; Maurin, Jan K.; Pluciński, Franciszek; Czarnocki, Zbigniew

    2015-01-01

    A series of new N-aryl-substituted thiomorpholine-3,5-diones were synthesized. Crystal structures of seven compounds were established on the basis of X-ray crystallography. Stable at room temperature diastereomers were detected for (2-phenyl)-substituted derivatives using 1H NMR. The dynamic stereochemistry of compound 36 was studied with variable-temperature 1H NMR and the mechanism of diastereomers interconversion was proposed on the basis of quantum chemical calculations.

  7. Synthesis and antileishmanial activity of new 1-Aryl-1H-Pyrazole-4- carboximidamides derivatives

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Mauricio S. dos; Gomes, Adriana O.; Bernardino, Alice M.R.; Souza, Marcos C. de, E-mail: alicerolim@globo.co [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Programa de Pos-Graduacao em Quimica Organica; Khan, Misbahul A. [The Islamia University of Bahawalpur (Pakistan). Chemistry Dept.; Brito, Monique A. de [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Fac. de Farmacia. Lab. de Quimica Medicinal Computacional; Castro, Helena C.; Abreu, Paula A. [Universidade Federal Fluminense (LABioMol/GCM/UFF), Niteroi, RJ (Brazil). Inst. de Biologia. Lab. de Antibioticos, Bioquimica e Modelagem Molecular; Rodrigues, Carlos R. [Universidade Federal do Rio de Janeiro (ModMol/UFRJ), RJ (Brazil). Fac. de Farmacia. Lab. de Modelagem Molecular e QSAR; Leo, Rosa M.M. de; Leon, Leonor L.; Canto-Cavalheiro, Marilene M. [Fundacao Oswaldo Cruz (IOC/FIOCRUZ), Rio de Janeiro, RJ (Brazil). Instituto Oswaldo Cruz. Lab. de Bioquimica de Tripanosomatideos

    2011-07-01

    Chemotherapy for leishmaniasis, diseases caused by protozoa of the genus Leishmania, remains inefficient in several treatments. So there is a need to search for new drugs. In this work, we have synthesized 1-aryl-1H-pyrazole-4-carboximidamides derivatives and evaluated antileishmanial activities in vitro, as well as cytotoxic effects. Structure-activity relationship (SAR) studies were carried out with all the compounds of the series. Compound 2 showed an activity profile that can be improved through medicinal chemistry strategies. (author)

  8. Palladium-catalysed ortho arylation of acetanilides

    Indian Academy of Sciences (India)

    Guo-zhen zhang; Cheng-Qun Chen; Xin-Hua Feng; Guo-Sheng Huang

    2010-03-01

    The palladium-catalysed direct arylation of acetanilides by using C-H activation methodology has been demonstrated. Several acetanilides were coupled with aryl iodides in the presence of 10 mol% of Pd(OAc)2, 1.0 equiv of Cu(OTf)2, and 0.6 equiv of Ag2O to afford the corresponding products in moderate to excellent yields. The results showed that the amount of Ag2O was important for this protocol.

  9. Design,synthesis and antitumor evaluation of a new series of N-substituted-thiourea derivatives

    Institute of Scientific and Technical Information of China (English)

    Jian LI; Bing XIONG; Xi-shan XIONG; Hong LIU; Xiao-min LUO; Hua-liang JIANG; Jin-zhi TAN; Li-li CHEN; Jian ZHANG; Xu SHEN; Chang-lin MEI; Li-li FU; Li-ping LIN; Jian DING

    2006-01-01

    Aim: To design and synthesize a novel class of protein tyrosine kinase inhibitors, featuring the N-(2-oxo-1,2-dihydroquinolin-3-yl-methyl)-thiourea framework. Methods: First, compounds 1 and 2 were identified using the virtual screening approach in conjunction with binding assay based on surface plasmon resonance. Subsequently, 3 regions of compounds 1 and 2 were selected for chemical modification. All compounds were characterized potent inhibitory activities toward the human lung adenocarcinoma cell line SPAC1. Results: Forty new compounds (1-2, 3a-g, 4a-w, and 5a-l) were designed, synthesized and bioassayed. Six compounds (1, 3e, 41,4w, 5a, and 5b) were found to show promising inhibitory activity against the SPAC1 tumor cell line. The inhibitory activity of compound 5a increases approximately 10 times more than that of the original compound 1. Conclusion: This study provides a promising new template with potential antitumor activity.

  10. Absence of aryl hydrocarbon hydroxylase (AHH) in three marine bivalves

    Energy Technology Data Exchange (ETDEWEB)

    Vandermeulen, J.H. (Bedford Inst. of Oceanography, Dartmouth, Nova Scotia); Penrose, W.R.

    1978-05-01

    Bivalves exposed to short-term (4 d) and long-term (6 yr) oil pollution were assayed for aryl hydrocarbon hydroxylase (AHH) and N-demethylase activity. Short-term induction studies were carried out on Mya arenaria, Mytilus edulis, and Ostrea edulis incubated in aqueous extracts of Kuwait crude oil or Bunker C (fuel) oil. For the chronic-induction studies Mya arenaria and Mytilus edulis were collected from oiled clam beds (Arrow Bunker C) in Chedabucto Bay, Nova Scotia. None of the bivalves showed any basal or petroleum-hydrocarbon-induced aryl hydrocarbon hydroxylase or N-demethylase activity, as shown by their inability to metabolize benzopyrene or imipramine. In contrast, oil-free control trout and trout taken from a polluted lake readily metabolized both these compounds. The inability of these bivalves to degrade petroleum aromatic hydrocarbons and the tendency of these compounds to accumulate in their tissues present an opportunity for transfer of unaltered hydrocarbons into the food chain.

  11. ¬Enzyme Inhibition Studies on N-Substituted Sulfonamides Derived from m-phenetidine

    Directory of Open Access Journals (Sweden)

    *Aziz-ur-Rehman

    2013-06-01

    Full Text Available Organic synthesis of various compounds followed by biological activities is the going on methodology in the world for pharmacological evaluation. The undertaken research is the synthesis of N-(3-ethoxyphenyl-4-methylbenzenesulfonamide (3 through condensation reaction of m-phenetidine (1 and 4-methylbenzenesulfonyl chloride (2 using basic aqueous media of sodium carbonate. Further, the synthesized compound 3 was reacted with different alkyl/aralkyl halides (4a-j using DMF as aprotic polar solvent and NaH as a base to yield 5a-j compounds. The synthesized molecules were characterized from their spectral data. The synthesized compounds were evaluated against cholinesterase (AChE and BChE, lipoxygenase (LOX, urease, chymotrypsin and tyrosinase enzymes; and found to be the moderate inhibitor against tyrosinase enzyme.

  12. ¬Enzyme Inhibition Studies on N-Substituted Sulfonamides Derived from m-phenetidine

    Directory of Open Access Journals (Sweden)

    Aziz-ur-Rehman

    2013-09-01

    Full Text Available Organic synthesis of various compounds followed by biological activities is the going on methodology in the world for pharmacological evaluation. The undertaken research is the synthesis of N-(3-ethoxyphenyl-4-methylbenzenesulfonamide (3 through condensation reaction of m-phenetidine (1 and 4-methylbenzenesulfonyl chloride (2 using basic aqueous media of sodium carbonate. Further, the synthesized compound 3 was reacted with different alkyl/aralkyl halides (4a-j using DMF as aprotic polar solvent and NaH as a base to yield 5a-j compounds. The synthesized molecules were characterized from their spectral data. The synthesized compounds were evaluated against cholinesterase (AChE and BChE, lipoxygenase (LOX, urease, chymotrypsin and tyrosinase enzymes; and found to be the moderate inhibitor against tyrosinase enzyme.

  13. N-substituted benzyl matrinic acid derivatives inhibit hepatitis C virus (HCV replication through down-regulating host heat-stress cognate 70 (Hsc70 expression.

    Directory of Open Access Journals (Sweden)

    Na-Na Du

    Full Text Available Heat-stress cognate 70 (Hsc70 is a host factor that helps hepatitis C virus (HCV to complete its life cycle in infected hepatocytes. Using Hsc70 as a target for HCV inhibition, a series of novel N-substituted benzyl matrinic/sophoridinic acid derivatives was synthesized and evaluated for their anti-HCV activity in vitro. Among these analogues, compound 7c possessing N-p-methylbenzyl afforded an appealing ability to inhibit HCV replication with SI value over 53. Furthermore, it showed a good oral pharmacokinetic profile with area-under-curve (AUC of 13.4 µM·h, and a considerably good safety in oral administration in mice (LD50>1000 mg/kg. As 7c suppresses HCV replication via an action mode distinctly different from that of the marketed anti-HCV drugs, it has been selected as a new mechanism anti-HCV candidate for further investigation, with an advantage of no or decreased chance to induce drug-resistant mutations.

  14. Optimized Anti-pathogenic Agents Based on Core/Shell Nanostructures and 2-((4-Ethylphenoxyethyl-N-(substituted-phenylcarbamothioyl-benzamides

    Directory of Open Access Journals (Sweden)

    Mariana Carmen Chifiriuc

    2012-10-01

    Full Text Available The purpose of this study was to design a new nanosystem for catheter surface functionalization with an improved resistance to Staphylococcus aureus ATCC 25923 and Pseudomonas aeruginosa ATCC 27853 colonization and subsequent biofilm development. New 2-((4 ethylphenoxymethyl-N-(substituted-phenylcarbamothioyl-benzamides were synthesized and used for coating a core/shell nanostructure. Their chemical structures were elucidated by NMR, IR and elemental analysis, being in agreement with the proposed ones. Fe3O4/C12 of up to 5 nm size had been synthesized with lauric acid as a coating agent and characterized by XRD, FT-IR, TGA, TEM and biological assays. The catheter pieces were coated with the fabricated nanofluid in magnetic field. The microbial adherence ability was investigated in 6 multiwell plates by using culture based methods and Scanning Electron Microscopy (SEM. The nanoparticles coated with the obtained compounds 1a–c inhibited the adherence and biofilm development ability of the S. aureus and P. aeruginosa tested strains on the catheter functionalized surface, as shown by the reduction of viable cell counts and SEM examination of the biofilm architecture. Using the novel core/shell/adsorption-shell to inhibit the microbial adherence could be of a great interest for the biomedical field, opening new directions for the design of film-coated surfaces with improved anti-biofilm properties.

  15. Action mechanism of antioxidation and anticorrosion andmolecular design for perfiuoropolyether fluid additives (Ⅱ)Synthesis and measurement of N-substituted perfluoropolyalkylether phenyla-mide

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Three kinds of the antioxidation and anticorrosion additives from the N-substituted per-fluoropolyalkylether phenylamide (PFPEA) were selected and synthesized. UV and IR spectralanalyses were carried out, and strong absorption peaks of UV from benzene ring are about 240.7,215.4 and 230.1 nm, respectively. The characteristic peaks of IR from the C==O are about 1713.9,1712.2 and 1710.8 cm-1, respectively. The antioxidant and anticorrosive property was tested forthe three synthesized additives. The results show that the weight loss of lubrication oil can de-crease by 1/7, 1/9 and 1/25 respectively after adding synthesized additives. The thermal decom-position temperature(TD) in the presence of Al2O3 can increase by 19-22℃. From theoretic andexperimental study it indicates that the PFPEAs with nitrogen heteroatom not only accepts electronfrom perfluoropolyalkylether oxygen radical (RfO.) to form a stable adduct and to prevent RfO. de-composing further, but also donates electron to form chemical adsorption film and to protect metalfrom corrosion. These additives have shown the better property of the antioxidation and anticorro-sion. An electron-releasing group, or phenyl group, introduced to the N-atom of this kind of com-pound can improve the antioxidant and anticorrosive efficiency of the additives.

  16. SYNTHESIS AND BIOLOGICAL EVALUATION OF SOME NOVEL PYRAZOLINE DERIVATIVES DERIVED FROM N-SUBSTITUTED QUINOLINYL CHALCONES

    Directory of Open Access Journals (Sweden)

    Jennifer Fernandes

    2013-10-01

    Full Text Available A series of novel substituted 1-amino-3-(5-phenyl-4, 5-dihydro-1H-pyrazol-3-yl quinolin-2(1H-one (AJP1-AJP8 have been synthesized upon reaction with 1-amino-3-cinnamoyl-quinolin-2(1H-one by using hydrazine hydrate as cyclising medium in alcohol medium. 1-amino-3-cinnamoyl-quinolin-2(1H-one were synthesized by condensing 3-acetyl-1-amino-quinolin-2-one with different substituted benzaldehyde in presence of ethanolic KOH. The structures of the final synthesized compounds were confirmed by IR, 1H NMR and mass spectra. The synthesized compounds were screened for their antibacterial and antifungal activity against Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Candida albicans, Aspergillus niger respectively by cup plate method. Compounds AJP1, AJP3, AJP4, AJP5, AJP6 and AJP7 showed good antibacterial activity compared to the standard drug amoxicillin. Compounds AJP1, AJP3, AJP5 and AJP7 showed moderate antifungal activity compared to the standard drug fluconazole. The synthesized compounds were screened for their anti-inflammatory activity by Carrageenan induced paw edema method. Compounds AJP1 and AJP7 showed significant anti-inflammatory activity compared to the standard drug diclofenac sodium.

  17. CuI-catalyzed Synthesis of Aryl Thiocyanates from Aryl Iodides

    Institute of Scientific and Technical Information of China (English)

    Ye Feng WANG; Yuan ZHOU; Jia Rui WANG; Lei LIU; Qing Xiang GUO

    2006-01-01

    An operationally simple and inexpensive catalyst system was developed for the cross coupling of potassium thiocyanate with aryl iodides by using CuI as catalyst, 1, 10-phenanthroline as ligand, and tetraethylammonium iodide as activator. The procedure is applicable for the synthesis of diverse aryl thiocyanates without any exotic, poisonous reagents.

  18. Effects of structure and number of heteroatom on the π-π stacking inte-ractions of benzene with N-substituted coronenes: A theoretical study

    Directory of Open Access Journals (Sweden)

    Pouya Karimi

    2014-07-01

    Full Text Available Stability of the π-π stacking interactions in the Ben||N-substituted-coronene complexes was stu-died using the computational quantum chemistry methods (where Ben is benzene and || denotes π-π stacking interaction, and N-substituted-coronene is coronene molecule which substituted with different number of N atoms. The results reveal simultaneous effects of structure and number of Heteroatom on the π-π stacking interactions with N-substituted-coronenes. Changing the number of Heteroatom N in N-substituted-coronenes and substitution of 8N-coronene with electron-withdrawing or electron-donating X groups alter the electron charge density at rings of this molecule and leads to different binding energies in the Ben||X-8N-substituted-coronene com-plexes. Results indicate that electron-withdrawing groups lead to higher π–π stacking binding energies compared to electron-donating ones in the Ben||X-8N-substituted-coronene complexes.

  19. Structural, conformational, theoretical and pharmacological study of some amides derived from 3,7-dimethyl-9-[( N-substituted)-4-chlorobenzamido]3,7-diazabicyclo[3.3.1]nonane-9-carboxamide

    Science.gov (United States)

    Fernández, M. J.; Toledano, M. S.; Gálvez, E.; Orjales, A.; Berisa, A.; Labeaga, L.; Fonseca, I.; Sanz-Aparicio, J.; Bellanato, J.

    1995-06-01

    A series of 3,7-dimethyl-9-[( N-substituted)-4-chlorobenzamido]-3,7-diazabicyclo[3.3.1]nonane-9-carboxamides 1-3 have been synthesized and studied by infrared, Raman, 1H and 13C NMR spectroscopy and molecular modeling techniques. The crystal structure of 3,7-dimethyl-9-[( N-benzyl)-4-chlorobenzamido]-3,7-diazabicyclo[3.3.1]nonane-9-carboxamide ( 2) was determined by X-ray diffraction. In CDCl 3 and CD 3OD solutions, these compounds adopt a non-distorted chair-chair conformation with the N-substituents in an equatorial position. Compound 2 prevented acetic acid induced writhing in mice.

  20. One-pot, two-step, microwave-assisted palladium-catalyzed conversion of aryl alcohols to aryl fluorides via aryl nonaflates.

    Science.gov (United States)

    Wannberg, Johan; Wallinder, Charlotta; Ünlüsoy, Meltem; Sköld, Christian; Larhed, Mats

    2013-04-19

    A convenient procedure for converting aryl alcohols to aryl fluorides via aryl nonafluorobutylsulfonates (ArONf) is presented. Moderate to good one-pot, two-step yields were achieved by this nonaflation and microwave-assisted, palladium-catalyzed fluorination sequence. The reductive elimination step was investigated by DFT calculations to compare fluorination with chlorination, proving a larger thermodynamic driving force for the aryl fluoride product. Finally, a key aryl fluoride intermediate for the synthesis of a potent HCV NS3 protease inhibitor was smoothly prepared with the novel protocol.

  1. Synthesis of N-benzoyl-N'-aryl selenoureas under PTC

    Institute of Scientific and Technical Information of China (English)

    WANG Hai; LIN Qi; ZHANG You-ming; WEI Tai-bao

    2004-01-01

    Recently many syntheses of selenium-containing compounds have been reported and studied, in which compounds selenoureas are used as the precursors for the syntheses of selenium-nitrogen heterocyclic compounds and their activities have received increasing attentions.Herein, we report the facile preparation of N-benzoyl-N'-aryl selenourea derivatives using potassium selenocyanate.In this typical procedure, Benzoyl chloride 1 was treated with potassium selenocyanate in CH2C12 under the condition of solid-liquid phase transfer catalysis using polyethylene glycal-400 as the catalyst to give the corresponding benzoyl isoselenocyanate 2. This compound did not need to be isolated and reacted with aromatic amine affording the N-benzoyl-N'-aryl selenourea derivatives 3.The reaction is described as:All the experiments were carried out under the condition of solid-liquid phase transfer catalysis using polyethylene glycal-400 as the catalyst and room temperature. And the structure was determined by IR, 1H NMR and 13C NMR. Selected data for N-benzoyl-N'-(4-fluoro)-selenourea:IR(KBr) 3426, 3274, 1672,1234,1155(C=Se); 1HMR(500MHz, DMSO) δ 12.85 (1H,S),11.86(1H,S), 7.27(2H,d,J=2.15), 7.98(2H,s,J=l.15), 7.30(2H,d,J=2.05), 7.56(2H.t,J=6.50),7.67(1H,t,J=6.20); 13C NMR(500MHz, DMSO)δ 181,168(C=Se),135,133, 132,115, 128.3, 128.8,161, 129.

  2. Biological processes for the production of aryl sulfates

    DEFF Research Database (Denmark)

    2016-01-01

    The present invention generally relates to the field of biotechnology as it applies to the production of aryl sulfates using polypeptides or recombinant cells comprising said polypeptides. More particularly, the present invention pertains to polypeptides having aryl sulfotransferase activity......, recombinant host cells expressing same and processes for the production of aryl sulfates employing these polypeptides or recombinant host cells....

  3. Aryl Radical Geometry Determines Nanographene Formation on Au(111)

    NARCIS (Netherlands)

    Jacobse, Peter H.; van den Hoogenband, Adrianus; Moret, Marc Etienne; Klein Gebbink, Robertus J M; Swart, Ingmar

    2016-01-01

    The Ullmann coupling has been used extensively as a synthetic tool for the formation of C−C bonds on surfaces. Thus far, most syntheses made use of aryl bromides or aryl iodides. We investigated the applicability of an aryl chloride in the bottom-up assembly of graphene nanoribbons. Specifically, th

  4. Synthesis of N-substituted phthalimidoalkyl 1,2,3-triazoles via click chemistry

    Directory of Open Access Journals (Sweden)

    Moara T. da Silva

    2012-06-01

    Full Text Available In the present work, we have developed a facile procedure for synthesis of new N-phthalimidoalkyl 1H-1,2,3-Triazoles (1-4(a-h using DMF, 10 mol% CuI, Et3N and ultrasound energy at room temperature. This protocol furnished 28 new compounds in 20 to 30 min of reaction and moderate-to-excellent yields (64-94%.

  5. Synthesis of new N-substituted benzodiazepine derivatives with potential anxiolytic activity.

    Science.gov (United States)

    Kossakowski, J; Zawadowski, T; Turło, J

    1997-01-01

    In continuation of the development of antipsychotic and anxiolytic agents with a reduced propensity toward extrapyramidal side-effects, a series of N-aminoalkyl derivatives of (s)-(+)-2,3-dihydro-1H-pyrrolo[2,1-c][1,4]benzodiazepine-5,11-(10H, 11aH)-dione was prepared. Evaluation of these compounds in revealed a very low affinity for 5-HT1A receptor.

  6. Smiles Rearrangement Based Practical One-pot Synthesis of N-Alkyl/aryl-6-aminoquinolines from 6-Hydroxylquinoline

    Energy Technology Data Exchange (ETDEWEB)

    Xie, Yongsheng; Vijaykumar, B. V. D.; Jang, Kiwan; Choi, Kyungmin; Shin, Dongsoo [Changwon National Univ., Changwon (Korea, Republic of); Zuo, Hua [Southwest Univ., Chongqing (Korea, Republic of); Yoon, Yongjin [Gyeongsang National Univ., Chinju (Korea, Republic of)

    2013-12-15

    The C-N coupling protocol reported herein represents a convenient and practical synthesis of N-alkyl/aryl-6-aminoquinolines in a three-step one-pot manner by simple addition of 6-hydroxyquinoline and N-alkyl/aryl-2-chloroacetamides with Cs{sub 2}CO{sub 3} or K{sub 2}CO{sub 3} in DMF at 150 .deg. C via Smiles rearrangement. An electron donating substituent on the nitrogen counterpart would accelerate the rearrangement process to achieve various anilines in good yields. We currently engaged in making a chemical library including multifarious N-substituted-6-aminoquinolines, to be used in the screening for specific AChEI activity. Furthermore, this work extends the scope of preparing different heterocyclic synthons in drug design for various biological activities. Aminoquinolines and their derivatives are important chemical entities that are widely used as pro-drugs and drugs due to their antimicrobial, cytotoxic and anti-malarial activities etc.

  7. Lithium choreography: intramolecular arylations of carbamate-stabilised carbanions and their mechanisms probed by in situ IR spectroscopy and DFT calculations.

    Science.gov (United States)

    Fournier, Anne M; Nichols, Christopher J; Vincent, Mark A; Hillier, Ian H; Clayden, Jonathan

    2012-12-14

    Deprotonation of O-allyl, O-propargyl or O-benzyl carbamates in the presence of a lithium counterion leads to carbamate-stabilised organolithium compounds that may be quenched with electrophiles. We now report that when the allylic, propargylic or benzylic carbamate bears an N-aryl substituent, an aryl migration takes place, leading to stereochemical inversion and C-arylation of the carbamate α to oxygen. The aryl migration is an intramolecular S(N) Ar reaction, despite the lack of anion-stabilising aryl substituents. Our in situ IR studies reveal a number of intermediates along the rearrangement pathway, including a "pre-lithiation complex," the deprotonated carbamate, the rearranged anion, and the final arylated carbamate. No evidence was obtained for a dearomatised intermediate during the aryl migration. DFT calculations predict that during the reaction the solvated Li cation moves from the carbanion centre, thus freeing its lone pair for nucleophilic attack on the remote phenyl ring. This charge separation leads to several alternative conformations. The one having Li(+) bound to the carbamate oxygen gives rise to the lowest-energy transition structure, and also leads to inversion of the configuration. In agreement with the IR studies, the DFT calculations fail to locate a dearomatised intermediate.

  8. Discovery of aryl ureas and aryl amides as potent and selective histamine H3 receptor antagonists for the treatment of obesity (part I).

    Science.gov (United States)

    Gao, Zhongli; Hurst, William J; Guillot, Etienne; Czechtizky, Werngard; Lukasczyk, Ulrike; Nagorny, Raisa; Pruniaux, Marie-Pierre; Schwink, Lothar; Sanchez, Juan Antonio; Stengelin, Siegfried; Tang, Lei; Winkler, Irvin; Hendrix, James A; George, Pascal G

    2013-06-01

    A series of structurally novel aryl ureas was derived from optimization of the HTS lead as selective histamine H3 receptor (H3R) antagonists. The SAR was explored and the data obtained set up the starting point and foundation for further optimization. The most potent tool compounds, as exemplified by compounds 2l, 5b, 5d, and 5e, displayed antagonism potencies in the subnanomolar range in in vitro human-H3R FLIPR assays and rhesus monkey H3R binding assays.

  9. Polymeric media comprising polybenzimidazoles N-substituted with organic-inorganic hybrid moiety

    Science.gov (United States)

    Klaehn, John R [Idaho Falls, ID; Peterson, Eric S [Idaho Falls, ID; Wertsching, Alan K [Idaho Falls, ID; Orme, Christopher J [Shelley, ID; Luther, Thomas A [Idaho Falls, ID; Jones, Michael G [Pocatello, ID

    2009-12-15

    A PBI compound includes imidazole nitrogens at least a portion of which are substituted with an organic-inorganic hybrid moiety may be included in a separator medium. At least 85% of the imidazole nitrogens may be substituted. The organic-inorganic hybrid moiety may be an organosilane moiety, for example, (R)Me.sub.2SiCH.sub.2-- where R is selected from among methyl, phenyl, vinyl, and allyl. The separatory medium may exhibit an H.sub.2, Ar, N.sub.2, O.sub.2, CH.sub.3, or CO.sub.2 gas permeability greater than the gas permeability of a comparable separatory medium comprising the PBI compound without substitution. The separatory medium may further include an electronically conductive medium and/or ionically conductive medium. The separatory medium may be used as a membrane (semi-permeable, permeable, and non-permeable), a barrier, an ion exhcange media, a filter, a gas chromatography coating (such as stationary phase coating in affinity chromatography), etc.

  10. One-pot synthesis of N-aryl 1,4-dihydropyridine derivatives and their biological activities

    Indian Academy of Sciences (India)

    Isaivani Dhinakaran; Vediappen Padmini; Nattamai Bhuvanesh

    2015-12-01

    Highly efficient, one pot synthesis of N-aryl, 1,4-dihydopyridines was carried out by four component reaction. Synthesized 1,4-dihydropyridines were screened for their cytotoxicity against A549 cell line. All the synthesized compounds exhibited better DPPH radical scavenging activity.

  11. 3-Amido-3-aryl-piperidines: A Novel Class of Potent, Selective, and Orally Active GlyT1 Inhibitors.

    Science.gov (United States)

    Pinard, Emmanuel; Alberati, Daniela; Alvarez-Sanchez, Ruben; Brom, Virginie; Burner, Serge; Fischer, Holger; Hauser, Nicole; Kolczewski, Sabine; Lengyel, Judith; Mory, Roland; Saladin, Christian; Schulz-Gasch, Tanja; Stalder, Henri

    2014-04-10

    3-Amido-3-aryl-piperidines were discovered as a novel structural class of GlyT1 inhibitors. The structure-activity relationship, which was developed, led to the identification of highly potent compounds exhibiting excellent selectivity against the GlyT2 isoform, drug-like properties, and in vivo activity after oral administration.

  12. Preparation of Peptide p-Nitroanilides using an Aryl Hydrazine Solid Support

    Energy Technology Data Exchange (ETDEWEB)

    Kwon, Y; Welsh, K; Mitchell, A R; Camarero, J A

    2004-08-05

    Peptide p-nitroanilides are useful compounds for studying protease activity, however the poor nucleophilicity of p-nitroaniline makes their preparation difficult. We describe a new efficient approach for the Fmoc-based synthesis of peptide p-nitroanilides using an aryl hydrazine resin. Mild oxidation of the peptide hydrazide resin yields a highly reactive acyl diazene, which efficiently reacts with weak nucleophiles. We have prepared several peptide p-nitroanilides, including substrates for the Lethal Factor protease from B. anthracis.

  13. Inorganic base-catalyzed formation of antivirally active N-substituted benzamides from α-amido sulfones and N-nucleophile

    Directory of Open Access Journals (Sweden)

    Wang Zhenchao

    2011-05-01

    Full Text Available Abstract Background Heteronucleophiles as well as carbanionic reagents can be used to react with α-amido sulfones, thus giving the opportunity to prepare a large array of amino derivatives. Since, novel 1,3,4-oxadiazole-2-thiol derivatives can serve as potent nucleophiles, we employed 5-subsititued phenyl-1,3,4-oxadiazole-2-thiols as the nucleophilic source of nitrogen in the reaction with α-amido sulfones. Results A series of N-substituted benzamides bearing 1,3,4-oxadiazol unit were prepared for the first time by the reaction of in situ generated protected imine from α-amido sulfones with 5-subsititued phenyl-1,3,4-oxadiazole-2-thiols as the source of nitrogen nucleophile. Some of the synthesized products displayed favourable antiviral activity against cucumber mosaic virus (CMV in preliminary antiviral activity tests. The title compounds 5c, 5o and 5r revealed curative activity of 42.2%, 48.7% and 40.5%, respectively against CMV (inhibitory rate compared to the commercial standard Ningnanmycin (53.4% at 500 μg/mL. Conclusion A practical synthetic route to N-benzoyl-α-amido sulfones by the reaction of 5-subsititued phenyl-1,3,4-oxadiazole-2-thiols as the source of nitrogen nucleophiles with in situ generated protected imine from N-benzoyl-α-amido sulfones is presented. The reaction catalyzed by an inorganic base has considerable significance to exploit the potential of α-amido sulfones in organic synthesis.

  14. Electrospun N-Substituted Polyurethane Membranes with Self-Healing Ability for Self-Cleaning and Oil/Water Separation.

    Science.gov (United States)

    Fang, Wenyuan; Liu, Libin; Li, Ting; Dang, Zhao; Qiao, Congde; Xu, Jinku; Wang, Yanyan

    2016-01-18

    Membranes with special functionalities, such as self-cleaning, especially those for oil/water separation, have attracted much attention due to their wide applications. However, they are difficult to recycle and reuse after being damaged. Herein, we put forward a new N-substituted polyurethane membrane concept with self-healing ability to address this challenge. The membrane obtained by electrospinning has a self-cleaning surface with an excellent self-healing ability. Importantly, by tuning the membrane composition, the membrane exhibits different wettability for effective separation of oil/water mixtures and water-in-oil emulsions, whilst still displaying a self-healing ability and durability against damage. To the best of our knowledge, this is the first report to demonstrate a self-healing membrane for oil/water separation, which provides the fundamental research for the development of advanced oil/water separation materials.

  15. Aryl Polyphosphonates: Useful Halogen-Free Flame Retardants for Polymers

    Directory of Open Access Journals (Sweden)

    Li Chen

    2010-10-01

    Full Text Available Aryl polyphosphonates (ArPPN have been demonstrated to function in wide applications as flame retardants for different polymer materials, including thermosets, polycarbonate, polyesters and polyamides, particularly due to their satisfactory thermal stability compared to aliphatic flame retardants, and to their desirable flow behavior observed during the processing of polymeric materials. This paper provides a brief overview of the main developments in ArPPN and their derivatives for flame-retarding polymeric materials, primarily based on the authors’ research work and the literature published over the last two decades. The synthetic chemistry of these compounds is discussed along with their thermal stabilities and flame-retardant properties. The possible mechanisms of ArPPN and their derivatives containing hetero elements, which exhibit a synergistic effect with phosphorus, are also discussed.

  16. Living Polymerization of N -Substituted β-Alanine N -Carboxyanhydrides: Kinetic Investigations and Preparation of an Amphiphilic Block Copoly-β-Peptoid

    KAUST Repository

    Grossmann, Arlett

    2012-07-03

    Poly(α-peptoid)s (N-substituted polyglycines) are interesting peptidomimetic biomaterials that have been discussed for many applications. Poly(β-peptoid)s (N-substituted poly-β-alanines), although equally intriguing, have received much less attention. Here we present results that suggest that while N-substituted β-alanine N-carboxyanhydrides can undergo a living nucleophilic ring-opening polymerization, the solubility of poly(β-peptoid)s can be very poor, which contributes to the limited accessibility using other synthetic approaches. The living character of the polymerization was utilized for the preparation of the first polymerized amphiphilic block copoly-β-peptoid. Our results may open a new route towards highly defined functional poly(β-peptoid)s which could represent biomaterials. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  17. Synthesis of 1-aryl-3-(3,4-dihydro-2H-chromen-5-yl)ureas as TNF-α inhibitors

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    A new series of compounds, 1-aryl-3-(3,4-dihydro-2H-chromen-5-yl) ureas, have been synthesized and their structures were confirmed by FAB-MS and 1H NMR. The preliminary pharmacological screening showed that these compounds inhibited TNF-αproduction in lipopolysaccharide (LPS)-stimulated THP-1 cells.

  18. A 1H, 13C and 15N NMR study in solution and in the solid state of six N-substituted pyrazoles and indazoles.

    Science.gov (United States)

    Claramunt, Rosa M; Santa María, M Dolores; Sanz, Dionisia; Alkorta, Ibon; Elguero, José

    2006-05-01

    Three N-substituted pyrazoles and three N-substituted indazoles [1-(4-nitrophenyl)-3,5-dimethylpyrazole (1), 1-(2,4-dinitrophenyl)-3,5-dimethylpyrazole (2), 1-tosyl-pyrazole (3), 1-p-chlorobenzoylindazole (4), 1-tosylinda-zole (5) and 2-(2-hydroxy-2-phenylethyl)-indazole (6)] have been studied by NMR spectroscopy in solution (1H, 13C, 15N) and in the solid state (13C, 15N). The chemical shifts have been compared with GIAO/DFT calculated absolute shieldings. Some discrepancies have been analyzed.

  19. Efficient Pathway for the Preparation of Aryl(isoquinoline)iodonium(III) Salts and Synthesis of Radiofluorinated Isoquinolines.

    Science.gov (United States)

    Yuan, Zheliang; Cheng, Ran; Chen, Pinhong; Liu, Guosheng; Liang, Steven H

    2016-09-19

    Iodonium compounds play a pivotal role in (18) F-fluorination of radiopharmaceuticals containing non-activated arenes. However, preparation of these species is limited to oxidation conditions or exchange with organometallics that are prepared from aryl halides. Herein we describe a novel "one-pot" process to assemble aryl(isoquinoline)iodonium salts in 40-94 % yields from mesoionic carbene silver complex and Aryl-I-Py2 (OTf)2 . The method is general, practical, and compatible with well-functionalized molecules as well as useful for the preparation of a wide range of (18) F-labeled isoquinolines resulting in up to 92 % radiochemical conversion. As proof of concept, a fluorinated isoquinoline alkaloid, (18) F-aspergillitine is prepared in 10 % isolated radiochemical yield from the corresponding phenyl(aspergillitine)iodonium salt.

  20. Binding of dihydroxynaphthyl aryl ketones to tubulin colchicine site inhibits microtubule assembly.

    Science.gov (United States)

    Gutierrez, Eunices; Benites, Julio; Valderrama, Jaime A; Calderon, Pedro Buc; Verrax, Julien; Nova, Esteban; Villanelo, Felipe; Maturana, Daniel; Escobar, Cristian; Lagos, Rosalba; Monasterio, Octavio

    2015-10-23

    Dihydroxynaphthyl aryl ketones 1-5 have been evaluated for their abilities to inhibit microtubule assembly and the binding to tubulin. Compounds 3, 4 and 5 displayed competitive inhibition against colchicine binding, and docking analysis showed that they bind to the tubulin colchicine-binding pocket inducing sheets instead of microtubules. Remarkable differences in biological activity observed among the assayed compounds seem to be related to the structure and position of the aryl substituent bonded to the carbonyl group. Compounds 2, 3 and 4, which contain a heterocyclic ring, presented higher affinity for tubulin compared to the carbocyclic analogue 5. Compound 4 showed the best affinity of the series, with an IC50 value of 2.1 μM for microtubule polymerization inhibition and a tubulin dissociation constant of 1.0 ± 0.2 μM, as determined by thermophoresis. Compound 4 was more efficacious in disrupting microtubule assembly in vitro than compound 5 although it contains the trimethoxyphenyl ring present in colchicine. Hydrogen bonds with Asn101 of α-tubulin seem to be responsible for the higher affinity of compound 4 respects to the others.

  1. Novel 3-Oxazolidinedione-6-aryl-pyridinones as Potent, Selective, and Orally Active EP3 Receptor Antagonists.

    Science.gov (United States)

    Jin, Jian; Morales-Ramos, Angel; Eidam, Patrick; Mecom, John; Li, Yue; Brooks, Carl; Hilfiker, Mark; Zhang, David; Wang, Ning; Shi, Dongchuan; Tseng, Pei-San; Wheless, Karen; Budzik, Brian; Evans, Karen; Jaworski, Jon-Paul; Jugus, Jack; Leon, Lisa; Wu, Charlene; Pullen, Mark; Karamshi, Bhumika; Rao, Parvathi; Ward, Emma; Laping, Nicholas; Evans, Christopher; Leach, Colin; Holt, Dennis; Su, Xin; Morrow, Dwight; Fries, Harvey; Thorneloe, Kevin; Edwards, Richard

    2010-10-14

    High-throughput screening and subsequent optimization led to the discovery of novel 3-oxazolidinedione-6-aryl-pyridinones exemplified by compound 2 as potent and selective EP3 antagonists with excellent pharmacokinetic properties. Compound 2 was orally active and showed robust in vivo activities in overactive bladder models. To address potential bioactivation liabilities of compound 2, further optimization resulted in compounds 9 and 10, which maintained excellent potency, selectivity, and pharmacokinetic properties and showed no bioactivation liability in glutathione trapping studies. These highly potent, selective, and orally active EP3 antagonists are excellent tool compounds for investigating and validating potential therapeutic benefits from selectively inhibiting the EP3 receptor.

  2. Cloning and heterologous expression of two aryl-aldehyde dehydrogenases from the white-rot basidiomycete Phanerochaete chrysosporium

    Energy Technology Data Exchange (ETDEWEB)

    Nakamura, Tomofumi [Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581 (Japan); Fukuoka Institute of Health and Environmental Sciences, 39 Mukaizano, Dazaifu-shi, Fukuoka 818-0135 (Japan); Ichinose, Hirofumi [Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581 (Japan); Wariishi, Hiroyuki, E-mail: hirowari@agr.kyushu-u.ac.jp [Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581 (Japan); Bio-Architecture Center, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581 (Japan); Innovation Center for Medical Redox Navigation, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581 (Japan)

    2010-04-09

    We identified two aryl-aldehyde dehydrogenase proteins (PcALDH1 and PcALDH2) from the white-rot basidiomycete Phanerochaete chrysosporium. Both PcALDHs were translationally up-regulated in response to exogenous addition of vanillin, one of the key aromatic compounds in the pathway of lignin degradation by basidiomycetes. To clarify the catalytic functions of PcALDHs, we isolated full-length cDNAs encoding these proteins and heterologously expressed the recombinant enzymes using a pET/Escherichia coli system. The open reading frames of both PcALDH1 and PcALDH2 consisted of 1503 nucleotides. The deduced amino acid sequences of both proteins showed high homologies with aryl-aldehyde dehydrogenases from other organisms and contained ten conserved domains of ALDHs. Moreover, a novel glycine-rich motif 'GxGxxxG' was located at the NAD{sup +}-binding site. The recombinant PcALDHs catalyzed dehydrogenation reactions of several aryl-aldehyde compounds, including vanillin, to their corresponding aromatic acids. These results strongly suggested that PcALDHs metabolize aryl-aldehyde compounds generated during fungal degradation of lignin and various aromatic xenobiotics.

  3. Multimetallic catalysed cross-coupling of aryl bromides with aryl triflates

    Science.gov (United States)

    Ackerman, Laura K. G.; Lovell, Matthew M.; Weix, Daniel J.

    2015-08-01

    The advent of transition-metal catalysed strategies for forming new carbon-carbon bonds has revolutionized the field of organic chemistry, enabling the efficient synthesis of ligands, materials, and biologically active molecules. In cases where a single metal fails to promote a selective or efficient transformation, the synergistic cooperation of two distinct catalysts--multimetallic catalysis--can be used instead. Many important reactions rely on multimetallic catalysis, such as the Wacker oxidation of olefins and the Sonogashira coupling of alkynes with aryl halides, but this approach has largely been limited to the use of metals with distinct reactivities, with only one metal catalyst undergoing oxidative addition. Here, we demonstrate that cooperativity between two group 10 metal catalysts--(bipyridine)nickel and (1,3-bis(diphenylphosphino)propane)palladium--enables a general cross-Ullmann reaction (the cross-coupling of two different aryl electrophiles). Our method couples aryl bromides with aryl triflates directly, eliminating the use of arylmetal reagents and avoiding the challenge of differentiating between multiple carbon-hydrogen bonds that is required for direct arylation methods. Selectivity can be achieved without an excess of either substrate and originates from the orthogonal reactivity of the two catalysts and the relative stability of the two arylmetal intermediates. While (1,3-bis(diphenylphosphino)propane)palladium reacts preferentially with aryl triflates to afford a persistent intermediate, (bipyridine)nickel reacts preferentially with aryl bromides to form a transient, reactive intermediate. Although each catalyst forms less than 5 per cent cross-coupled product in isolation, together they are able to achieve a yield of up to 94 per cent. Our results reveal a new method for the synthesis of biaryls, heteroaryls, and dienes, as well as a general mechanism for the selective transfer of ligands between two metal catalysts. We anticipate that this

  4. Synthesis, reactive oxygen species generation and copper-mediated nuclease activity profiles of 2-aryl-3-amino-1,4-naphthoquinones.

    Science.gov (United States)

    Khodade, Vinayak S; Dharmaraja, Allimuthu T; Chakrapani, Harinath

    2012-06-01

    Here we report a series of 2-aryl-3-amino-1,4-naphthoquinones that generated reactive oxygen species (ROS) such as superoxide and hydrogen peroxide upon incubation in pH 7.4 under ambient aerobic conditions. ROS generation from these compounds was sensitive to structural modifications at the 3-amino position and a 2-aryl substituent promoted ROS generation. A number of these compounds were found to induce DNA damage in the presence of Cu(II) without any added reducing agent. Our data suggests that 2-aryl-3-amino-1,4-naphthoquinones' propensity to produce ROS correlated well with its DNA damage inducing ability. 2-Phenyl-3-pyrrolid-1-yl-1,4-naphthoquinone (22) was found to damage DNA at 1 μM suggesting that these compounds may have therapeutic relevance in targeting cancers which over-express Cu(II).

  5. In Silico Identification of an Aryl Hydrocarbon Receptor Antagonist with Biological Activity In Vitro and In Vivo

    OpenAIRE

    2014-01-01

    The aryl hydrocarbon receptor (AHR) is critically involved in several physiologic processes, including cancer progression and multiple immune system activities. We, and others, have hypothesized that AHR modulators represent an important new class of targeted therapeutics. Here, ligand shape–based virtual modeling techniques were used to identify novel AHR ligands on the basis of previously identified chemotypes. Four structurally unique compounds were identified. One lead compound, 2-((2-(5-...

  6. C(aryl-O Bond Formation from Aryl Methanesulfonates via Consecutive Deprotection and SNAr Reactions with Aryl Halides in an Ionic Liquid

    Directory of Open Access Journals (Sweden)

    Yang Chen

    2007-04-01

    Full Text Available An efficient K3PO4-mediated synthesis of unsymmetrical diaryl ethers using the ionic liquid [Bmim]BF4 (1-butyl-3-methylimidazolium tetrafluoroborate as solvent has been developed. The procedure involves consecutive deprotection of aryl methane-sulfonates and a nucleophilic aromatic substitution (SNAr with activated aryl halides.

  7. Copper-catalysed N-arylation of arylsulfonamides with aryl bromides and aryl iodides using KF/Al2O3

    Indian Academy of Sciences (India)

    Rahman Hosseinzadeh; Mahmood Tajbakhsh; Maryam Mohadjerani; Mohammad Alikarami

    2010-03-01

    An efficient synthesis of -arylsulfonamides with a variety of aryl bromides, aryl iodides and heteroaryl bromides using KF/Al2O3 as a suitable base, CuI as an inexpensive catalyst and ,'-dimethylethylenediamine (,'-DMEDA) as an effective ligand is described.

  8. Aryl biphenyl-3-ylmethylpiperazines as 5-HT7 receptor antagonists.

    Science.gov (United States)

    Kim, Jeeyeon; Kim, Youngjae; Tae, Jinsung; Yeom, Miyoung; Moon, Bongjin; Huang, Xi-Ping; Roth, Bryan L; Lee, Kangho; Rhim, Hyewhon; Choo, Il Han; Chong, Youhoon; Keum, Gyochang; Nam, Ghilsoo; Choo, Hyunah

    2013-11-01

    The 5-HT7 receptor (5-HT7 R) is a promising therapeutic target for the treatment of depression and neuropathic pain. The 5-HT7 R antagonist SB-269970 exhibited antidepressant-like activity, whereas systemic administration of the 5-HT7 R agonist AS-19 significantly inhibited mechanical hypersensitivity and thermal hyperalgesia. In our efforts to discover selective 5-HT7 R antagonists or agonists, aryl biphenyl-3-ylmethylpiperazines were designed, synthesized, and biologically evaluated against the 5-HT7 R. Among the synthesized compounds, 1-([2'-methoxy-(1,1'-biphenyl)-3-yl]methyl)-4-(2-methoxyphenyl)piperazine (28) was the best binder to the 5-HT7 R (pKi =7.83), and its antagonistic property was confirmed by functional assays. The selectivity profile of compound 28 was also recorded for the 5-HT7 R over other serotonin receptor subtypes, such as 5-HT1 R, 5-HT2 R, 5-HT3 R, and 5-HT6 R. In a molecular modeling study, the 2-methoxyphenyl moiety attached to the piperazine ring of compound 28 was proposed to be essential for the antagonistic function.

  9. Evaluation of In Vitro Anti-inflammatory Activity of Azomethines of Aryl Oxazoles

    Directory of Open Access Journals (Sweden)

    V. Niraimathi

    2011-01-01

    Full Text Available Ability to inhibit erythrocyte hemolysis is often used as a characteristic of the membrane stabilising action of chemical compounds. Azomethines of aryl oxazoles were evaluated for anti-inflammatory by in vitro hemolytic membrane stabilising study. The effect of inflammation condition was studied on erythrocyte exposed to hypotonic solution. In this in vitro method the membrane stabilising action leads to anti-inflammatory activity and was compared with that produced by diclofenac sodium as the reference standard. Results of the evaluation indicate that the synthesised compounds found to exhibit membrane stabilising activity.

  10. Synthesis, characterization and antiproliferative activity of β-aryl-δ-iodo-γ-lactones

    Science.gov (United States)

    Wzorek, Alicja; Gawdzik, Barbara; Gładkowski, Witold; Urbaniak, Mariusz; Barańska, Anita; Malińska, Maura; Woźniak, Krzysztof; Kempińska, Katarzyna; Wietrzyk, Joanna

    2013-09-01

    A convenient pathway for the synthesis of new of β-aryl-δ-iodo-γ-lactones is described. The synthetic route led to both cis and trans isomers which were separated by column chromatography or crystallization. The structures of synthesized compounds were confirmed by spectroscopic methods: IR, NMR and HR-MS. For lactones with naphthyl ring (6e and 7e) the crystal structures were also obtained. The lactones were screened for biological evaluation against cancer line HL-60 (human promyelocytic leukemia). The tests showed that the presence of substituent at the benzene ring does not significantly affect the antiproliferative activity of the compound.

  11. Synthesis and bioactivities of 6,7,8-trimethoxy-N-aryl-4-aminoquinazoline derivatives.

    Science.gov (United States)

    Liu, Gang; Hu, De-Yu; Jin, Lin-Hong; Song, Bao-An; Yang, Song; Liu, Ping-Shen; Bhadury, Pinaki S; Ma, Yao; Luo, Hui; Zhou, Xian

    2007-10-15

    A series of 4-aminoquinazoline derivatives is prepared by the nucleophilic substitution reaction of 6,7,8-trimethoxy-4-chloroquinazoline and aryl amine. The structures of the compounds are confirmed by elemental analysis, IR, and (1)H NMR spectral data. The compounds are also evaluated for their ability to inhibit tumor cells PC3, A431, Bcap-37, and BGC823 by MTT assays. Among them, 6b and 6e are found as potent inhibitors, with IC(50) values ranging from 5.8 to 9.8microM, in vitro assay.

  12. Molecular modelling of some para-substituted aryl methyl telluride and diaryl telluride antioxidants

    Science.gov (United States)

    Frisell, H.; Engman, L.

    2000-08-01

    Quantum mechanical calculations using the 3-21G(d) basis-set were performed on some p-substituted diaryl tellurides and aryl methyl tellurides, and the corresponding cationic radicals of these compounds. Calculated relative radical stabilization energies (RSE:s) were shown to correlate with experimentally determined peak oxidation potentials ( R=0.93) and 125Te-NMR chemical shifts ( R=0.91). A good correlation was also observed between the RSE:s and the Mulliken charge at the tellurium atoms ( R=0.97). The results showed that Hartree-Fock calculations using the 3-21G(d) basis set was sufficiently accurate for estimating the impact of p-substituents in aryl tellurides on experimentally determined properties such as peak oxidation potentials and 125Te-NMR chemical shifts.

  13. Synthesis of β-arylated alkylamides via Pd-catalyzed one-pot installation of a directing group and C(sp3)–H arylation

    Science.gov (United States)

    Zhang, Yi; Cao, Xiaoji; Wan, Jie-Ping

    2016-01-01

    Summary The synthesis of β-arylated alkylamides via alkyl C–H bond arylation has been realized by means of direct one-pot reactions of acyl chlorides, aryl iodides and 8-aminoquinoline. Depending on the structure of the starting materials, both single and double β-arylated alkylamides could be accessed. PMID:27340500

  14. Antibacterial sesquiterpene aryl esters from Armillaria mellea.

    Science.gov (United States)

    Donnelly, D M; Abe, F; Coveney, D; Fukuda, N; O'Reilly, J; Polonsky, J; Prangé, T

    1985-01-01

    Investigation of the mycelial extract of Armillaria mellea led to the isolation of the known melleolide (2a) and two new sesquiterpene aryl eters, 4-O-methylmelleolide (2b) and judeol (1c). Their structures were deduced from spectral data and that of (2b) confirmed by X-ray analysis. The new esters (1c) and (2b) showed strong antibacterial activity against gram-positive bacteria.

  15. Fluoroalkylation of aryl ether perfluorocyclobutyl polymers

    OpenAIRE

    Ligon, Clark; Ameduri, Bruno; Boutevin, Bernard; Smith, Dennis

    2008-01-01

    International audience; Post functionalization of aryl ether perfluorocyclobutyl (PFCB) polymers with fluoroalkyl side chains was accomplished with Umemoto's FITS reagents. The fluoroalkylated PFCB polymers (20 % functionalized) showed increases in both hydrophobicity and oleophobicity. Static contact angle for hexadecane was increased after fluoroalkylation from 0° to greater than 30° for the two PFCB polymers tested. Increased oil repellency makes these materials potential candidates for va...

  16. NEW TRENDS IN ARYL HYDROCARBON RECEPTOR BIOLOGY

    OpenAIRE

    Fernández-Salguero, Pedro M.; Sonia eMulero-Navarro

    2016-01-01

    Traditionally considered as a critical intermediate in the toxic and carcinogenic response to dioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD), the Aryl hydrocarbon/Dioxin receptor (AhR) has proven to be also an important regulator of cell physiology and organ homeostasis. AhR has become an interesting and actual area of research mainly boosted by a significant number of recent studies analyzing its contribution to the proper functioning of the immune, hepatic, cardiovascular, vascular and ...

  17. New Trends in Aryl Hydrocarbon Receptor Biology

    OpenAIRE

    Mulero-navarro, Sonia; Fernandez-Salguero, Pedro M.

    2016-01-01

    Traditionally considered as a critical intermediate in the toxic and carcinogenic response to dioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD), the Aryl hydrocarbon/Dioxin receptor (AhR) has proven to be also an important regulator of cell physiology and organ homeostasis. AhR has become an interesting and actual area of research mainly boosted by a significant number of recent studies analyzing its contribution to the proper functioning of the immune, hepatic, cardiovascular, vascular and ...

  18. Synthesis, Characterization, and Biological Activity of 4-(2-Hydroxy-5-(aryl-diazenylphenyl-6-(arylpyrimidin-2-ols Derivatives

    Directory of Open Access Journals (Sweden)

    Chandrashekhar P. Pandhurnekar

    2013-01-01

    Full Text Available With the aim of synthesizing new heterocyclic compounds and exploring biological potency, new series of chalcones, that is, 3-(2-hydroxy-5-(aryl-diazenylphenyl-1-(arylprop-2-en-1-one and their pyrimidine derivatives, that is, 4-(2-hydroxy-5-(aryl-diazenylphenyl-6-(arylpyrimidin-2-ols were synthesized using different aromatic amines and salicylaldehyde as starting moieties. The structures of newly synthesized compounds were confirmed using different spectroscopic techniques such as IR, 1H-NMR, 13C-NMR, and mass spectral analysis, and elemental analysis. The newly synthesized pyrimidines derivatives were screened for their in vitro antibacterial and antifungal activities. It was observed that some of the newly synthesized compounds had shown promising activity against several bacterial and fungal stains. Anti-bacterial activity and anti-fungal activity studies revealed that pyrimidine derivatives consisting of nitro group in their molecular structure possess better activity than their corresponding chalcones.

  19. Synthesis and pharmacological evaluation of (6-substituted 4-Oxo-4 H -chromene-3 yl methyl N-substituted aminoacetates

    Directory of Open Access Journals (Sweden)

    Gajbhiye Asmita

    2008-01-01

    Full Text Available A series of the title compounds were synthesized and characterized by spectral data. All the compounds were evaluated for in vitro antihistaminic activity by inhibition of isotonic contractions induced by histamine on isolated guinea pig ileum and the compound 6-k showed significant activity. A few compounds have also been screened for in vivo bronchodilatory activity. These compounds exhibited significant protection against histamine-induced convulsions in guinea pig at the dose of 50 µmol.

  20. Synthesis and optical properties of new 5'-aryl-substituted 2,5-bis(3-decyl-2,2'-bithiophen-5-yl)-1,3,4-oxadiazoles

    Science.gov (United States)

    Kostyuchenko, Anastasia Sergeevna; Zheleznova, Tatyana Yu; Stasyuk, Anton Jaroslavovich; Kurowska, Aleksandra; Domagala, Wojciech

    2017-01-01

    New photoluminescent donor–acceptor–donor (DAD) molecules, namely 5'-aryl-substituted 2,5-bis(3-decyl-2,2'-bithiophen-5-yl)-1,3,4-oxadiazoles were prepared by palladium-catalyzed coupling from readily available compounds such as ethyl 3-decyl-2,2'-bithiophene-5-carboxylate and aryl halides. The obtained compounds feature increasing bathochromic shifts in their emission spectra with increasing aryl-substituent size yielding blue to bluish-green emissions. At the same time, their absorption spectra are almost independent from the identity of the terminal substituent with λmax values ranging from 395 to 405 nm. The observed trends are perfectly predicted by quantum chemical DFT/TDDFT calculations carried out for these new molecules.

  1. Utility of N-aryl 2-aroylhydrazono-propanehydrazonoyl chlorides as precursors for synthesis of new functionalized 1,3,4-thiadiazoles with potential antimicrobial activity

    Directory of Open Access Journals (Sweden)

    Abdou O. Abdelhamid

    2015-11-01

    Full Text Available Starting from N-aryl 2-aroylhydrazono-propanehydrazonoyl chlorides, a series of new functionalized 1,3,4-thiadiazoles were prepared. The structures of the compounds prepared were confirmed by both elemental and spectral analyses as well as by alternate synthesis. The mechanisms of the studied reactions are outlined. The antimicrobial activities of the compounds prepared were screened and the results showed that most of such compounds exhibit considerable activities.

  2. Synthesis and In Vitro Antimicrobial, Anthelmintic and Insecticidal Activities Study of 4(4'-Bromophenyl-6-substituted-aryl-1-acetyl pyrimidine-2-thiols

    Directory of Open Access Journals (Sweden)

    Rita Bamnela

    2010-01-01

    Full Text Available A new series of 4(4'-bromophenyl-6-substituted aryl-1-acetyl pyrimidine-2-thiol derivatives were synthesized by heating chalcones with thiourea, in the presence of ethanolic potassium hydroxide, followed by treatment with acetyl chloride. The structure of the compounds was characterized by IR and H1 NMR spectral study and elemental analysis. The compounds were screened for their antimicrobial, anthelmintic and insecticidal activities. All the compounds exhibited significant to moderate biological activities.

  3. Palladium-Catalyzed alpha-Arylation of Tetramic Acids

    DEFF Research Database (Denmark)

    Storgaard, Morten; Dorwald, F. Z.; Peschke, B.;

    2009-01-01

    A mild, racemization-free, palladium-Catalyzed alpha-arylation of tetramic acids (2,4-pyrrolidinediones) has been developed. Various amino acid-derived tetramic acids were cleanly arylated by treatment with 2 mol % of Pd(OAc)(2), 4 mol % of a sterically demanding biaryl phosphine, 2.3 equiv of K2CO...

  4. Selective copper catalysed aromatic N-arylation in water

    DEFF Research Database (Denmark)

    Engel-Andreasen, Jens; Shimpukade, Bharat; Ulven, Trond.

    2013-01-01

    4,7-Dipyrrolidinyl-1,10-phenanthroline (DPPhen) was identified as an efficient ligand for copper catalyzed selective arom. N-arylation in water. N-Arylation of indoles, imidazoles and purines proceeds with moderate to excellent yields and complete selectivity over aliph. amines. Aq. medium and th...

  5. Why do p-nitro-substituted aryl azides provide unintended dark reactions with proteins?

    Science.gov (United States)

    Popova, Tatyana V; Reinbolt, Joseph; Ehresmann, Bernard; Shakirov, Makhmut M; Serebriakova, Marina V; Gerassimova, Yulia V; Knorre, Dmitri G; Godovikova, Tatyana S

    2010-07-01

    Aryl azide-mediated photo cross-linking has been widely used to obtain structural features in biological systems, even though the reactive species generated upon photolysis in aqueous solution have not been well characterized. We have established a mechanistic framework for the formation of adducts between photoactivated 5-azido-2-nitrobenzoyl reagents and protein functional groups. Photolysis of the aryl azide tethered to biotin via an amide linkage yields a cross-link with streptavidin. The ability of the pre-irradiated reagent to form a similar cross-link indicates that it is the long-lived reactive intermediate that contributes to the cross-link formation. The reactive intermediate forms an adduct with tryptophan. The sequence of the labeled peptide is found to be GlyTrp(*)ThrValAlaTrp(*)LysAsn, corresponding to residues 74-81 of the streptavidin sequence, where Trp(*) designates the modified Trp-75 and Trp-79. A peak at m/z 1455.1 corresponding to the calculated [M(peptide)+aryl nitrene+2O](+) molecular ion value has been observed for the labeled peptide. Product structure identification experiments support the assignment that the long-lived reactive intermediate is a p-nitro-N-arylhydroxylamine, which undergoes a number of transformations in aqueous solution leading to nitroso derivatives. A plausible mechanism of the interaction between tryptophan and nitroso compound is discussed.

  6. Anticonvulsant Profiles of Certain New 6-Aryl-9-substituted-6,9-diazaspiro-[4.5]decane-8,10-diones and 1-Aryl-4-substituted-1,4-diazaspiro[5.5]undecane-3,5-diones

    Directory of Open Access Journals (Sweden)

    Mohamed N. Aboul-Enein

    2014-09-01

    Full Text Available Synthesis and anticonvulsant potential of certain new 6-aryl-9-substituted-6,9-diazaspiro[4.5]decane-8,10-diones (6a–l and 1-aryl-4-substituted-1,4-diazaspiro[5.5] undecane-3,5-diones (6m–x are reported. The intermediates 1-[(aryl(cyanomethylamino] cycloalkanecarboxamides (3a–f were prepared via adopting Strecker synthesis on the proper cycloalkanone followed by partial hydrolysis of the obtained nitrile functionality and subsequent N-cyanomethylation. Compounds 3a–f were subjected to complete nitrile hydrolysis to give the respective carboxylic acid derivatives 4a–f which were cyclized under mild conditions to give the spiro compounds 5a–f. Ultimately, compounds 5a–f were alkylated or aralkylated to give the target compounds 6a–i and 6m–u. On the other hand, compounds 6j–l and 6v–x were synthesized from the intermediates 5a–f through alkylation, dehydration and finally tetrazole ring formation. Anticonvulsant screening of the target compounds 6a–x revealed that compound 6g showed an ED50 of 0.0043 mmol/kg in the scPTZ screen, being about 14 and 214 fold more potent than the reference drugs, Phenobarbital (ED50 = 0.06 mmol/kg and Ethosuximide (ED50 = 0.92 mmol/kg, respectively. Compound 6e exhibited an ED50 of 0.019 mmol/kg, being about 1.8 fold more potent than that of the reference drug, Diphenylhydantoin (ED50 = 0.034 mmol/kg in the MES screen. Interestingly, all the test compounds 6a–x did not show any minimal motor impairment at the maximum administered dose in the neurotoxicity screen.

  7. Anticonvulsant Profiles of Certain New 6-Aryl-9-substituted-6,9-diazaspiro-[4.5]decane-8,10-diones and 1-Aryl-4-substituted-1,4-diazaspiro[5.5]undecane-3,5-diones

    Science.gov (United States)

    Aboul-Enein, Mohamed N.; El-Azzouny, Aida A.; Attia, Mohamed I.; Maklad, Yousreya A.; Aboutabl, Mona E.; Ragab, Fatma; El-Hamid, Walaa H. A. Abd

    2014-01-01

    Synthesis and anticonvulsant potential of certain new 6-aryl-9-substituted-6,9-diazaspiro[4.5]decane-8,10-diones (6a–l) and 1-aryl-4-substituted-1,4-diazaspiro[5.5]undecane-3,5-diones (6m–x) are reported. The intermediates 1-[(aryl)(cyanomethyl)amino]cycloalkanecarboxamides (3a–f) were prepared via adopting Strecker synthesis on the proper cycloalkanone followed by partial hydrolysis of the obtained nitrile functionality and subsequent N-cyanomethylation. Compounds 3a–f were subjected to complete nitrile hydrolysis to give the respective carboxylic acid derivatives 4a–f which were cyclized under mild conditions to give the spiro compounds 5a–f. Ultimately, compounds 5a–f were alkylated or aralkylated to give the target compounds 6a–i and 6m–u. On the other hand, compounds 6j–l and 6v–x were synthesized from the intermediates 5a–f through alkylation, dehydration and finally tetrazole ring formation. Anticonvulsant screening of the target compounds 6a–x revealed that compound 6g showed an ED50 of 0.0043 mmol/kg in the scPTZ screen, being about 14 and 214 fold more potent than the reference drugs, Phenobarbital (ED50 = 0.06 mmol/kg) and Ethosuximide (ED50 = 0.92 mmol/kg), respectively. Compound 6e exhibited an ED50 of 0.019 mmol/kg, being about 1.8 fold more potent than that of the reference drug, Diphenylhydantoin (ED50 = 0.034 mmol/kg) in the MES screen. Interestingly, all the test compounds 6a–x did not show any minimal motor impairment at the maximum administered dose in the neurotoxicity screen. PMID:25250910

  8. Synthesis, Half-Wave Potentials and Antiproliferative Activity of 1-Aryl-substituted Aminoisoquinolinequinones

    Directory of Open Access Journals (Sweden)

    Juana Andrea Ibacache

    2014-01-01

    Full Text Available The synthesis of a variety of 1-aryl-7-phenylaminoisoquinolinequinones from 1,4-benzoquinone and arylaldehydes via the respective 1-arylisoquinolinequinones is reported. The cyclic voltammograms of the new compounds exhibit two one-electron reduction waves to the corresponding radical-anion and dianion and two quasi-reversible oxidation peaks. The half-wave potential values (EI½ of the members of the series have proven sensitive to the electron-donor effect of the aryl group (phenyl, 2-thienyl, 2-furyl at the 1-position as well as to the phenylamino groups (anilino, p-anisidino at the 7-position. The antiproliferative activity of the new compounds was evaluated in vitro using the MTT colorimetric method against one normal cell line (MRC-5 lung fibroblasts and two human cancer cell lines: AGS human gastric adenocarcinoma and HL-60 human promyelocytic leukemia cells in 72-h drug exposure assays. Among the series, compounds 5a, 5b, 5g, 5h, 6a and 6d exhibited interesting antiproliferative activities against human gastric adenocarcinoma. The 1-arylisoquinolinequinone 6a was found to be the most promising active compound against the tested cancer cell lines in terms of IC50 values (1.19; 1.24 µM and selectivity index (IS: 3.08; 2.96, respect to the anti-cancer agent etoposide used as reference (IS: 0.57; 0.14.

  9. N-Arylation of azaheterocycles with aryl and heteroaryl halides catalyzed by iminodiacetic acid resin-chelated copper complex

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    Iminodiacetic acid resin-chelated copper(Ⅱ) complex is effective in cross-coupling reactions between azaheterocycles and aryl or heteroaryl halides,providing N-arylated products in good to excellent yields.The copper catalyst is air stable and can be readily recovered and reused with minimal loss of activity for three runs.

  10. An efficient and convenient synthesis of N-substituted amides under heterogeneous condition using Al(HSO4)3 via Ritter reaction

    Indian Academy of Sciences (India)

    Elnaz Karimian; Batool Akhlaghinia; Sara S E Ghodsinia

    2016-03-01

    An efficient and inexpensive synthesis of N-substituted amides from the reaction of aliphatic and aromatic nitriles with various benzylic alcohols (secondary and tertiary) and tert-butyl alcohol by refluxing nitromethane via the Ritter reaction catalyzed by aluminum hydrogen sulfate [Al(HSO4)3] is described. Thecatalyst which is an air-stable, cost-effective solid acid could be readily recycled by filtration and reused four times without any significant loss of its activity.

  11. Improved selectivity in discriminating handedness and diameter of single-walled carbon nanotubes with N-substituted 3,6-carbazolylene-bridged chiral diporphyrin nanotweezers

    Science.gov (United States)

    Wang, Feng; Matsuda, Kazunari; Rahman, A. F. M. Mustafizur; Kimura, Takahide; Komatsu, Naoki

    2011-10-01

    Chiral diporphyrin nanotweezers 1 consisting of two chiral porphyrins with N-substituted 3,6-carbazolylene in between have been studied for the separation of single-walled carbon nanotubes (SWNTs). As compared to the analogous nanotweezers 2 without an N-substitutent, nanotweezers 1 with the N-octylcarbazolylene spacer exhibit much higher extraction ability and better selectivity for SWNTs. A narrower diameter range of SWNTs, from 0.88 to 0.92 nm, was selectively extracted with nanotweezers 1. In addition, only (7,6)-SWNTs of 0.90 nm diameter were optically enriched through extraction with 1, while SWNTs extracted with 2 showed lower optical purity of (7,6)-SWNTs. These enhanced extraction and discrimination abilities of 1 can be attributed to the formation of a more stable SWNT complex of 1 than of 2 in methanol.Chiral diporphyrin nanotweezers 1 consisting of two chiral porphyrins with N-substituted 3,6-carbazolylene in between have been studied for the separation of single-walled carbon nanotubes (SWNTs). As compared to the analogous nanotweezers 2 without an N-substitutent, nanotweezers 1 with the N-octylcarbazolylene spacer exhibit much higher extraction ability and better selectivity for SWNTs. A narrower diameter range of SWNTs, from 0.88 to 0.92 nm, was selectively extracted with nanotweezers 1. In addition, only (7,6)-SWNTs of 0.90 nm diameter were optically enriched through extraction with 1, while SWNTs extracted with 2 showed lower optical purity of (7,6)-SWNTs. These enhanced extraction and discrimination abilities of 1 can be attributed to the formation of a more stable SWNT complex of 1 than of 2 in methanol. Electronic supplementary information (ESI) available: 1H-NMR and HR-ESI-MS spectra of (R)-1. Table S1 and Figs S1 and S2. See DOI: 10.1039/c1nr10211g

  12. C- versus O-Arylation of an Enol-Lactone Using Potassium tert-butoxide

    Directory of Open Access Journals (Sweden)

    El Moktar Essassi

    2003-05-01

    Full Text Available Abstract: The use of potassium tert-butoxide as the base in arylation reactions of an enollactone with a series of benzyl halides was explored. Our work demonstrates that the ratio of C-arylation to O-arylation varies with the substitution pattern of the aryl halide.

  13. Synthesis and Antiviral Bioactivities of 2-Aryl- or 2-Methyl-3-(substituted- Benzalamino-4(3H-quinazolinone Derivatives

    Directory of Open Access Journals (Sweden)

    Zhuo Chen

    2007-12-01

    Full Text Available A simple and general method has been developed for the synthesis of various4(3H-quinazolinone derivatives by the treatment of the appropriate 3-amino-2-aryl-4(3H-quinazolinone with a substituted benzaldehyde in ethanol. The structures of the compoundswere characterized by elemental analysis, IR, 1H-NMR and 13C-NMR spectra. The title 2-aryl- or 2-methyl-3-(substituted-benzalamino-4(3H-quinazolinone compounds III-1~III-31 were found to possess moderate to good antiviral activity. Semi-quantitative PCR andReal Time PCR assays were used to ascertain the target of action of compound III-31against TMV. The studies suggest that III-31 possesses antiviral activity due to inductionof up-regulation of PR-1a and PR-5, thereby inhibiting virus proliferation and movementby enhancement of the activity of some defensive enzyme.

  14. Aryldicyclopentadienyltitanium compounds and their dinitrogen complexes

    NARCIS (Netherlands)

    Teuben, Jan Harmannus

    1973-01-01

    This thesis describes the synthesis and some characteristic properties of organotitanium compounds of the type Cp2TiR and the dinitrogen complexes (Cp2TiR)2N2 (R= aryl, benzyl; Cp = n-cyclopentadienyl). ... Zie: Summary

  15. Synthesis and antimicrobial activities of new oxime carbamates of 3-aryl-2-thioquinazolin-4(3H)-one

    Indian Academy of Sciences (India)

    Suresh S Patil; Swati D Jadhav; M B Deshmukh

    2012-09-01

    S-alkylation of 3-aryl-2-thioquinazolin-4(3H)-one (1) with chloroacetone gave 2-(propanonyl thio)-3-arylquinazol-4(3H)ones (2). Further, the treatment of compound (2) with hydroxylamine hydrochloride gave the corresponding oximes (3) which on reaction with phenyl isocyanate in THF yielded corresponding oxime carbamates 4. The synthesized compounds have been confirmed using IR and 1H NMR, mass spectral data together with elemental analysis. All newly synthesized compounds have been tested for their antibacterial and antifungal activities.

  16. Consecutive Three-Component Synthesis of 3-(HeteroAryl-1H-pyrazoles with Propynal Diethylacetal as a Three-Carbon Building Block

    Directory of Open Access Journals (Sweden)

    Thomas J. J. Müller

    2011-11-01

    Full Text Available A novel consecutive three-component synthesis of 3-(heteroaryl-1H-pyrazoles via room temperature Sonogashira arylation of propynal diethylacetal used as a propargyl aldehyde synthetic equivalent has been disclosed. The final acetal cleavage-cyclocondensation with hydrazine hydrochloride at 80 °C rapidly furnishes the title compounds in a one-pot fashion.

  17. Microwave Assisted Synthesis and Antimicrobial Activities of Some 2-Amino-4-aryl-3-cyano-6-(4’-hydroxy phenyl-pyridines

    Directory of Open Access Journals (Sweden)

    Priya Gothwal

    2011-01-01

    Full Text Available 4’-Hydroxy chalcones were treated with malononitrile in the presence of ammonium acetate under solventless microwave assisted condition to get 2-amino-4-aryl-3-cyano-6-(4’-hydroxy phenyl-pyridines. The prepared compounds were screened for their antimicrobial activity; some of them have exhibited promising antimicrobial activity.

  18. Synthesis and serotonin transporter activity of 1,3-bis(aryl)-2-nitro-1-propenes as a new class of anticancer agents

    DEFF Research Database (Denmark)

    McNamara, Yvonne M.; Cloonan, Suzanne M.; Knox, Andrew J.S.;

    2011-01-01

    Structural derivatives of 4-MTA, an illegal amphetamine analogue have been previously shown to have anticancer effects in vitro. In this study we report the synthesis of a series of novel 1,3-bis(aryl)-2-nitro-1-propene derivatives related in structure to 4-MTA. A number of these compounds...

  19. Synthesis of 2-Alkyl(aryl)-3-methylthio-6-methyl-6-arylpyrano-[4, 3-c] pyrazol-4(2H)-ones

    Institute of Scientific and Technical Information of China (English)

    Yu Xin LI; You Ming WANG; Xiao Ping YANG; Su Hua WANG; Zheng Ming LI

    2004-01-01

    The synthesis of 2-alkyl(aryl)-3-methylthiopyrano[4,3-c]pyrazol-4(2H)-ones via 5, 6-dihydro-2H-pyran-2, 4-dione-3-dithioacetals with (un)substituted hydrazines is described and the mechanism of the formation of title compounds is discussed. Their structures were confirmed by 1HNMR spectra and elemental analysis.

  20. Studies on the Syntheses and Biological Activities of 3-Aryl-6-(1,1'-biphenyl-4-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazines

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    A series of novel 3-aryl-6-(1,1-biphenyl-4-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4 ]thiadiazines was synthesized by means of the reactions between 3-aryl-4-amino-5-mercapto-1,2,4-triazoles and 2-bromo-4-phenylacetophenone. The structures of all the title compounds have been confirmed by virtue of elemental analysis, IR, 1H NMR, 13C NMR and mass spectra. The characteristics of 13C NMR peaks of the compounds were investigated. The plant growth regulating effects of those compounds were also determined.

  1. Synthesis of new 2-aryl-6-styryl-2,3-dihydropyridin-4(1H)-one derivatives from curcuminoids

    Institute of Scientific and Technical Information of China (English)

    Ying Peng Huo; Xu Qiu; Wei Yan Shao; Lin Kun An; Xian Zhang Bu; Lian Quan Gu

    2009-01-01

    Series of new 2-aryl-6-styryl-2,3-dihydropyridin-4(1H)-one derivatives were synthesized in acceptable to good yields by treatment of the curcuminoids with aqueous ammonia, the mechanism was proposed. By modification of the primary products, total 13 new compounds were obtained. The structures of all products were elucidated by spectroscopy analysis including HR-MS, ~1H NMR and ~(13)C NMR.

  2. A new one-pot synthesis of 1,2,4-oxadiazoles from aryl nitriles, hydroxylamine and crotonoyl chloride

    Indian Academy of Sciences (India)

    Masoumeh Zakeri; Majid M Heravi; Ebrahim Abouzari-Lotf

    2013-07-01

    The reaction of aryl nitriles with hydroxylamine using acetic acid as a catalyst followed by subsequent addition of crotonoyl chloride to the intermediate amidoxime represents a straightforward one-pot access to new 1,2,4-oxadiazole synthesis under mild conditions. The course of the reaction was found to be high yielding and all new compounds were well characterized by nuclear magnetic resonance (NMR), mass spectrometry (MS) and elemental analysis.

  3. Blue Fluorescent Materials Composed of Anthracene-Aryl Amine-Anthracene Derivatives for Organic Light-Emitting Diodes.

    Science.gov (United States)

    Lee, Seul Bee; Song, Ji Young; Yang, Hyung Jin; Kim, Young Kwan; Yoon, Seung Soo

    2015-07-01

    Blue fluorescent emitters based on anthracene-aryl amine-anthracene derivatives were studied for efficient OLEDs. Compound 1 exhibited efficient EL propereties with luminous and power efficien- cies of 4.50 cd/A and 1.75 lm/W at 200 mA/cm2, respectively and CIE coordinates of (0.18, 0.26) at 7.0 V.

  4. 3-Aryl-4-methyl-2-quinolones targeting multiresistant Staphylococcus aureus bacteria.

    Science.gov (United States)

    Doléans-Jordheim, Anne; Veron, Jean-Baptiste; Fendrich, Olivier; Bergeron, Emmanuelle; Montagut-Romans, Adrien; Wong, Yung-Sing; Furdui, Bianca; Freney, Jean; Dumontet, Charles; Boumendjel, Ahcène

    2013-04-01

    The NorA efflux pump lowers intracellular fluoroquinolone concentrations by expelling antibiotics through the membrane of Staphylococcus aureus. We identified 3-aryl-4-methyl-2-quinolin-2-ones as compounds able to restore the activity of the NorA substrate, ciprofloxacin, against resistant S. aureus strains, and acting as efflux pump inhibitors (EPI). In particular, 5-hydroxy-7-methoxy-4-methyl-3-phenylquinolin-2-one (6 c) presents both an EPI and an antimicrobial effect. Its efficacy and safety make it a potential candidate for further investigations.

  5. Anthocyan does not suppress transformation of aryl hydrocarbon receptor induced by dioxin.

    Science.gov (United States)

    Mukai, Rie; Fukuda, Itsuko; Nishiumi, Shin; Hosokawa, Keizo; Kanazawa, Kazuki; Ashida, Hitoshi

    2004-01-01

    Dioxins cause a variety of toxic effects through transformation of a cytosolic aryl hydrocarbon receptor (AhR). We have previously demonstrated that certain natural flavones and flavonols at the dietary levels suppress AhR transformation. In this study, we investigated whether 5 anthocyanidins, 15 anthocyanins, and protocatechuic acid suppress AhR transformation in mouse hepatoma Hepa-1c1c7 cells. All the compounds tested here at 5 microM unexpectedly failed to suppress the transformation induced by 0.1 nM TCDD, indicating that anthocyan does not have a potential to prevent dioxin toxicity.

  6. Solution to the C3-Arylation of Indazoles: Development of a Scalable Method.

    Science.gov (United States)

    Basu, Kallol; Poirier, Marc; Ruck, Rebecca T

    2016-07-01

    3-(Hetero)arylindazoles are important motifs in several biologically active compounds. Mild and flexible palladium-mediated Negishi reaction conditions are reported for the introduction of (hetero)aryl moieties at the 3-position of N(2)-SEM-protected indazoles in high yields. The requisite Zn-species are readily obtained via regioselective deprotonation and subsequent transmetalation. The methodology tolerates a variety of functional groups on both coupling partners and has been extended to bis-haloarene and heteroarene coupling partners where the most reactive halogen reacts first, leaving the second halogen for subsequent functionalization.

  7. Multicomponent, solvent-free synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[]-xanthen-11-one derivatives catalysed by cyanuric chloride

    Indian Academy of Sciences (India)

    Zhan-Hui Zhang; Peng Zhang; Shu-Hong Yang; Hong-Juan Wang; Jia Deng

    2010-05-01

    An efficient and direct protocol for the preparation of 12-aryl-8,9,10,12-tetrahydro-benzo[] xanthen-11-one derivatives employing a three-component one-pot reaction of aryl aldehydes, 2-naphthol and cyclic 1,3-dicarbonyl compounds in the presence of a catalytic amount of cyanuric chloride (2,4,6-trichloro-1,3,5-triazine, TCT) under solvent-free conditions is described. The desired products are obtained in high yields with short reaction times.

  8. Synthesis, Characterization, Anti-Inflammatory and in Vitro Antimicrobial Activity of Some Novel Alkyl/Aryl Substituted Tertiary Alcohols

    Directory of Open Access Journals (Sweden)

    Rafiuzzaman SaeedulHaq

    2011-12-01

    Full Text Available The synthesis of some novel alkyl/aryl substituted tertiary alcohols was accomplished in two steps. The synthetic route involves preparation of Grignard reagents by treating alkyl/aryl bromides with magnesium turnings in dry ether. Then substituted chalcones were reacted with the Grignard reagents to afford alkyl/aryl substituted tertiary alcohols 1-10. The structures of the synthesized compounds were assigned on the basis of FT-IR, 1H-NMR, 13C-NMR and mass spectroscopic data. The in vivo anti-inflammatory activity of the synthesized compounds was evaluated using the carrageenan-induced hind paw edema method and was compared with that of ibuprofen. Some of the newly synthesized compounds showed promising anti-inflammatory activity. The tertiary alcohols 1-10 were also screened for antibacterial activity against ten bacterial strains using seven Gram-positive and three Gram-negative bacteria and for antifungal activity against Aspergillus Flavus, Aspergillus Niger and Aspergillus pterus. Tertiary alcohols 1-10 were found to exhibit good to excellent antimicrobial activities compared to levofloxacin and fluconazole used as standard drugs.

  9. SYNTHESIS OF 6, 7-DISUBSTITUTED-2-ARYL-4H-1-BENZOPYRAN-4-ONES AS ANTIBACTERIAL AGENTS

    Directory of Open Access Journals (Sweden)

    Som Sukhen

    2012-03-01

    Full Text Available Benzopyrones constitute one of the major classes of natural products. Both semisynthetic and natural benzopyrone derivatives are known to possess important biological properties and as a result several attempts and procedures have been reported and developed for their synthesis. The present study was designed to synthesize various substituted 2-aryl-4H-1-benzopyran-4-one derivatives. The title compounds were prepared starting from a diketone i.e. 4-substituted-2-hydroxydiaroylmethane. The structures of these newly synthesized compounds were confirmed by their analytical and spectral data. The synthesized compounds were subjected for antibacterial screening against P.aeruginosa, B.subtilis and E.coli. Among all the derivatives 5d showed maximum activity against P.aeruginosa & E.coli and 5b showed highest activity against B.subtilis & E.coli. The results of the antibacterial screening suggest that some of the substituted 2-aryl-4H-1-benzopyran-4-one derivatives possess appreciable antibacterial activity and may prove useful in future drug development.

  10. Rat brain aryl acylamidase: further characterization of multiple forms.

    Science.gov (United States)

    Hsu, L L; Halaris, A E; Freedman, D X

    1982-01-01

    1. Two fractions of aryl acylamidase (EC 3.5.1.13) were further separated from rat brain extracts at pH 7.5 by ammonium sulfate precipitation and Bio-Gel chromatography. 2. 1,2,3,4-Tetrahydro-beta-carboline competitively inhibited (67%) fraction-1 but slightly inhibited (13%) fraction-2. Tetrahydroharman, 6-hydroxy-tetrahydroharman and harminic acid slightly inhibited both fractions. Harmalol inhibited fraction-1 but enhanced fraction-2. 6-Methoxy-harman, 6-methoxy-harmalan and harmaline enhanced both fractions. 3. Pargyline did not affect either fraction. Methiothepin, cyproheptadine and chlorimipramine inhibited fraction-1 but stimulated fraction-2. 4. Neostigmine moderately (30%) inhibited AAA-2 but did not have any significant effect on AAA-1. 5. These results indicate that the beta-carboline compounds might play a role in regulating activity of AAA-1 and 2 in brain. 6. Both fractions might be related to serotonergic neurons but only AAA-2 might be associated with acetylcholinesterase.

  11. General and efficient one-pot synthesis of novel sugar/heterocyclic(aryl) 1,2-diketones from sugar terminal alkynes by Sonogashira/tetra-n- butylammonium permanganate oxidation.

    Science.gov (United States)

    Zhang, Fuyi; Wu, Xiaopei; Wang, Liming; Liu, Hong; Zhao, Yufen

    2015-11-19

    A new approach for one-pot synthesis of novel sugar/heterocyclic(aryl) 1,2-diketones has been achieved by the reaction of various sugar terminal alkynes with heterocyclic(aryl) iodides at room temperature. This one-pot protocol includes Sonogashira coupling and mild n-Bu4NMnO4 oxidation reaction. This method is mild, general and efficient. Fifty-six examples have been given and the sugar/heterocyclic(aryl) 1,2-diketones were obtained in 71-94% yields. The sugar terminal alkynes include 9 structurally different sugars in pyranose, furanose, and acyclic form which have various protecting groups, sensitive groups, and sterically bulky substituents. The heterocyclic(aryl) iodides include sterically bulky heterocyclic compounds and iodobenzenes with electron-donating, electron-neutral, and electron-withdrawing substituents.

  12. The unexpected influence of aryl substituents in N-aryl-3-oxobutanamides on the behavior of their multicomponent reactions with 5-amino-3-methylisoxazole and salicylaldehyde

    Directory of Open Access Journals (Sweden)

    Volodymyr V. Tkachenko

    2014-12-01

    Full Text Available The switchable three-component reactions of 5-amino-3-methylisoxazole, salicylaldehyde and N-aryl-3-oxobutanamides under different conditions were studied and discussed. The unexpected influence of the aryl substituent in N-aryl-3-oxobutanamides on the behavior of the reaction was discovered. The key influence of ultrasonication and Lewis acid catalysts led to an established protocol to selectively obtain two or three types of heterocyclic scaffolds depending on the substituent in the N-aryl moiety.

  13. Copper/N,N-Dimethylglycine Catalyzed Goldberg Reactions Between Aryl Bromides and Amides, Aryl Iodides and Secondary Acyclic Amides

    Directory of Open Access Journals (Sweden)

    Liqin Jiang

    2014-08-01

    Full Text Available An efficient and general copper-catalyzed Goldberg reaction at 90–110 °C between aryl bromides and amides providing the desired products in good to excellent yields has been developed using N,N-dimethylglycine as the ligand. The reaction is tolerant toward a wide range of amides and a variety of functional group substituted aryl bromides. In addition, hindered, unreactive aromatic and aliphatic secondary acyclic amides, known to be poor nucleophiles, are efficiently coupled with aryl iodides through this simple and cheap copper/N,N-dimethylglycine catalytic system.

  14. Homocoupling of Aryl Bromides Catalyzed by Nickel Chloride in Pyridine

    Institute of Scientific and Technical Information of China (English)

    TAO, Xiao-Chun; ZHOU, Wei; ZHANG, Yue-Ping; DAI, Chun-ya; SHEN, Dong; HUANG, Mei

    2006-01-01

    Pyridine was used as a solvent for homocoupling of aryl bromides catalyzed by nickel chloride/triarylphosphine in the presence of zinc and recycled easily. Triphenylphosphine was the best ligand for nickel in this coupling reaction.

  15. Molecular interactions of the aryl hydrocarbon receptor and its biological and toxicological relevance for reproduction.

    Science.gov (United States)

    Pocar, P; Fischer, B; Klonisch, T; Hombach-Klonisch, S

    2005-04-01

    The dioxin/aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor responsive to both natural and man-made environmental compounds. AhR and its nuclear partner ARNT are expressed in the female reproductive tract in a variety of species and several indications suggest that the AhR might play a pivotal role in the physiology of reproduction. Furthermore, it appears to be the mediator of most, if not all, the adverse effects on reproduction of a group of highly potent environmental pollutants collectively called aryl hydrocarbons (AHs), including the highly toxic compound 2,3,7,8-tetrachlor-odibenzo-p-dioxin (TCDD). Although a large body of recent literature has implicated AhR in multiple signal transduction pathways, the mechanisms of action resulting in a wide spectrum of effects on female reproduction are largely unknown. Here we summarize the major types of molecular cross-talks that have been identified for the AhR and linked cell signaling pathways and that are relevant for the understanding of the role of this transcription factor in female reproduction.

  16. A convenient catalyst system for microwave accelerated cross-coupling of a range of aryl boronic acids with aryl chlorides

    Directory of Open Access Journals (Sweden)

    Milton Edward J

    2007-05-01

    Full Text Available Abstract A convenient microwave accelerated cross-coupling procedure between aryl chlorides with a range of boronic acids has been developed. An explanation for the low reactivity of highly fluorinated boronic acids in Suzuki coupling is provided.

  17. High boron content carboranyl-functionalized aryl ether derivatives displaying photoluminescent properties.

    Science.gov (United States)

    Lerouge, Frédéric; Viñas, Clara; Teixidor, Francesc; Núñez, Rosario; Abreu, Arturo; Xochitiotzi, Elba; Santillan, Rosa; Farfán, Norberto

    2007-05-21

    The reaction of alpha,alpha'-bis(3,5-bis(bromomethyl)phenoxy-p-xylene (3) with 4 equiv of the monolithium salt of 1-Ph-1,2-C2B10H11 or 1-Me-1,2-C2B10H11 gave the corresponding neutral carboranyl-functionalized aryl ether derivatives closo-4 and closo-5, respectively. These compounds contain four closo clusters that were degraded using basic conditions with KOH in EtOH, affording the corresponding nido-6 and nido-7 as potassium salts. Nido species were also isolated with tetramethylammonium as cation giving compounds nido-8 and nido-9 in good yield. The potassium salts showed good solubility in water and polar solvents. All these compounds were characterized by 1H, 11B and 13C NMR spectroscopy and UV-vis. The electronic data in different solvents indicated a solvatochromic shift for all compounds and a red shift of the absorption maxima for the nido species with respect to the closo derivatives. These neutral and anionic carboranyl-functionalized aryl ether derivatives represent a new family of high boron content luminescent compounds that show strong fluorescence emission in different solvents at room temperature. This phenomenon is very interesting considering the fact that none of the precursors have such a property. The fluorescence emission depends on the cluster substituent (Ph or Me) and the solvent polarity. Additionally, the fluorescence emission intensity was clearly dependent on the solvent polarity; the closo species showed strongest fluorescence intensities in the non-polar solvents, while anionic species were highly emissive in polar solvents.

  18. Synthesis and anticonvulsant activity of some potent 5,6-bis aryl 1,2,4-triazines

    Institute of Scientific and Technical Information of China (English)

    MALLIKARJUNA B.P.; SURESH KUMAR G.V.; SASTRY B.S.; NAGARAJ; MANOHARA K.P.

    2007-01-01

    In the present research, a series of 5,6-bis aryl 1,2,4-triazines 5a~5f were synthesized by condensation of various benzils 4a~4f with aminoguanidine bicarbonate and were screened in vivo, for their anticonvulsant and neurotoxicity studies.Compounds 5a, 5b and 5d were found to be potent molecules of this series, when compared with the reference drugs phenytoin sodium, diazepam and lamotrigine. The structures of these compounds were established by IR, 1H NMR, 13C NMR and mass spectroscopic data.

  19. Synthesis of aryl-1H-1,2,3-triazoles via 1,3-dipolar cycloaddition

    Directory of Open Access Journals (Sweden)

    Wagner O. Valença

    2012-06-01

    Full Text Available A series of Aryl-1H-1,2,3-triazoles were prepared from the reaction between aril-azide (1 with 1.5 equiv. of terminal alkynes (2a-o. The reactions carried out at room temperature and in the presence of CuI (10 mol% in acetonitrile. The compounds (3a-o were obtained in moderate-to-good yields (50-94%. In general, not was observed significant inductive effect on the reactivity of the alkynes (2a-f. The alcohol alkynes (2i-k showed moderate yields 50-72%. On the other hand, the reaction with alkyl alkynes (2m,n furnished the compounds (3m and (3n in excellent yields of 89% and 90%, respectively.

  20. Aryl chain analogues of the biotin vitamers as potential herbicides. Part 3.

    Science.gov (United States)

    Ashkenazi, Tali; Pinkert, Dalia; Nudelman, Ayelet; Widberg, Ayala; Wexler, Barry; Wittenbach, Vernon; Flint, Dennis; Nudelman, Abraham

    2007-10-01

    Novel aryl chain isosters and analogues of 7-keto-8-aminopelargonic acid (KAPA) and 7,8-diaminopelargonic acid (DAPA), the vitamer intermediates involved in the biosynthetic pathway of biotin, possessing chain lengths of eight carbon atoms, were prepared and evaluated as potential herbicides. In the greenhouse test the most active compounds were the fluorinated derivative 9d and the selenophenyl/furan mixture 17m/17p, which were most active against Foxtail millet. In the more sensitive Arabidopsis test the most active substances were 9a and 17m, which displayed GR(50) (concentration of active compound causing 50% growth inhibition) values of 0.2 and 0.5 mg kg(-1) respectively (values of < 50 mg kg(-1) are considered herbicidal).

  1. Advanced hybrid fluoropolymers from the cycloaddition of aryl trifluorovinyl ethers

    Science.gov (United States)

    Ligon, S. Clark, Jr.

    This dissertation discusses the synthesis of aryl trifluorovinyl ethers and their cycloaddition polymerization to give perfluorocyclobutyl (PFCB) polymers. To explore the stereochemistry of these polymers, simple monomfunctional aryl trifluorovinyl ethers were dimerized and the resultant cis and trans isomers were separated. Differences in structure help to improve understanding of the amorphous nature of the bulk PFCB polymeric material. To apply this knowledge, crown ether containing perfluorocyclobutyl (PFCB) polymers were synthesized for use in lithium ion battery applications. While poor solubility has hindered further development of these materials, slight modifications to structure may provide a solution. Also described is a fluorinated aryl vinyl ether and its attempted copolymerization with chlorotrifluoroethylene. While this copolymerization did not yield the desired materials, novel semifluorinated phenol precursors have been utilized in reactions with carboxylic acids to give polyesters and most recently with phosgene like species to give polycarbonates. Next, PFCB polymers were post functionalized with fluoroalkyl tethers to improve oleophobicity and hydrophobicity without decreasing thermal stability or optical clarity. In addition, various silica nanostructures were functionalized with aryl trifluorovinyl ethers. This includes the reaction of aryl silanes to give trifluorovinyl ether functional POSS and their polymerization to provide PFCB hybrid materials. Silane coupling agents were also used to functionalize colloidal silica and fumed silica nanoparticles. These procedures allow excellent dispersion of the silica nanoparticles throughout the fluoropolymer matrix. Finally, the reaction of aryl trifluorovinyl ether with nonfluorinated alkenes and alkynes was explored. In these reactions, the fluorinated olefin adds with the hydrocarbon olefin to give semifluorinated cyclobutanes (SFCB) and with the alkyne to give semifluorinated cyclobutene. The

  2. Synthesis and Antibacterial Activities of N-Substituted Pyrazole Curcumin Derivatives%姜黄素-N-取代吡唑类衍生物合成及抑菌活性

    Institute of Scientific and Technical Information of China (English)

    刘志昌; 王应红; 张元勤; 向清祥

    2012-01-01

    为了寻求杀菌剂的新的先导化合物,用姜黄素与取代酰肼反应得到13个新的姜黄素-N-取代吡唑类衍生物,其结构经IR,1H NMR,13C NMR,MS和元素分析所表征,初步抑菌实验结果表明,在1×10-4 mol/L浓度下,所有衍生物与姜黄素对比,对枯草杆菌、金黄色葡萄球菌、大肠杆菌、青霉、黑霉有较好的抑菌效果.其中,3,5-二(4-羟基-3-甲氧基苯基乙烯基)-N- 脒基吡唑(3c),3,5-二(4-羟基-3-甲氧基苯基乙烯基)-N-(苯并噻唑-2-硫基乙酰基)吡唑(3k),3,5-二(4-羟基-3-甲氧基苯基乙烯基)-N-(香豆素-3-甲酰基)吡唑(3m)有优异的抑菌效果(抑菌圈16.34~23.81 mm).这些结果表明含有噻唑环、脒基、香豆素环取代基可能有助于提高姜黄素-N-取代吡唑类衍生物的活性.%In order to find new lead compounds for the design of new antibacterial drugs, 13 novel N-substituted pyrazole curcumin derivatives were synthesized from curcumin and substituted hydrazide. The structures of all new compounds were confirmed by 1H NMR, 13C NMR, IR, MS techniques and elemental analysis. The results of their in vitro antibacterial tests indicated that, at the concentration of 1 × 10-4 mol/L, all of the derivatives displayed better activities than curcumin against B. subtilis, S. aureus, E. coli, A. niger, and Penicillium ch. The compounds 3,5-bis(4-hydroxy-3-methoxystyryI)-l-amidinopara-zole (3c), 3,5-bis(4-hydroxy-3-methoxystyryl)-l-(banzothiazol-2-sulfenyl)parazole (3k) and 3,5-bis(4-hydroxy-3-methoxy-styryl)-l-(coumarin-3-formoryl)parazole (3m) showed remarkable antibacterial activities (with inhibition zone of up 16.34 to 23.81 mm). The results showed that thiazole ring, or guanyl and coumarin ring substituents may enhance the activities of N-substituted pyrazole curcumin derivatives.

  3. Microwave-Promoted Rapid Synthesis of 1-Aryl-1, 2, 3-Triazoles

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Aryl azides and a-keto phosphorus ylides were reacted within 4~10 minutes with silica gel support, under microwave irridiation to afford corresponding l-aryl-l, 2, 3-triazoles in moderate to good yields.

  4. Ruthenium(II)-Catalyzed C-C Arylations and Alkylations: Decarbamoylative C-C Functionalizations.

    Science.gov (United States)

    Moselage, Marc; Li, Jie; Kramm, Frederik; Ackermann, Lutz

    2017-04-05

    Ruthenium(II)biscarboxylate catalysis enabled selective C-C functionalizations by means of decarbamoylative C-C arylations. The versatility of the ruthenium(II) catalysis was reflected by widely applicable C-C arylations and C-C alkylations of aryl amides, as well as acids with modifiable pyrazoles, through facile organometallic C-C activation.

  5. Decarboxylative Aminomethylation of Aryl- and Vinylsulfonates through Combined Nickel- and Photoredox-Catalyzed Cross-Coupling

    KAUST Repository

    Fan, Lulu

    2016-09-23

    A mild approach for the decarboxylative aminomethylation of aryl sulfonates by the combination of photoredox and nickel catalysis through C−O bond cleavage is described for the first time. A wide range of aryl triflates as well as aryl mesylates, tosylates and alkenyl triflates afford the corresponding products in good to excellent yields.

  6. Mechanisms and origins of switchable chemoselectivity of Ni-catalyzed C(aryl)-O and C(acyl)-O activation of aryl esters with phosphine ligands.

    Science.gov (United States)

    Hong, Xin; Liang, Yong; Houk, K N

    2014-02-05

    Many experiments have shown that nickel with monodentate phosphine ligands favors the C(aryl)-O activation over the C(acyl)-O activation for aryl esters. However, Itami and co-workers recently discovered that nickel with bidentate phosphine ligands can selectively activate the C(acyl)-O bond of aryl esters of aromatic carboxylic acids. The chemoselectivity with bidentate phosphine ligands can be switched back to C(aryl)-O activation when aryl pivalates are employed. To understand the mechanisms and origins of this switchable chemoselectivity, density functional theory (DFT) calculations have been conducted. For aryl esters, nickel with bidentate phosphine ligands cleaves C(acyl)-O and C(aryl)-O bonds via three-centered transition states. The C(acyl)-O activation is more favorable due to the lower bond dissociation energy (BDE) of C(acyl)-O bond, which translates into a lower transition-state distortion energy. However, when monodentate phosphine ligands are used, a vacant coordination site on nickel creates an extra Ni-O bond in the five-centered C(aryl)-O cleavage transition state. The additional interaction energy between the catalyst and substrate makes C(aryl)-O activation favorable. In the case of aryl pivalates, nickel with bidentate phosphine ligands still favors the C(acyl)-O activation over the C(aryl)-O activation at the cleavage step. However, the subsequent decarbonylation generates a very unstable tBu-Ni(II) intermediate, and this unfavorable step greatly increases the overall barrier for generating the C(acyl)-O activation products. Instead, the subsequent C-H activation of azoles and C-C coupling in the C(aryl)-O activation pathway are much easier, leading to the observed C(aryl)-O activation products.

  7. Synthesis, characterisation of few N-substituted 1,8-naphthalimide derivatives and their copper(II) complexes

    Indian Academy of Sciences (India)

    Nilotpal Barooah; Chandan Tamuly; Jubaraj B Baruah

    2005-03-01

    A few 1,8-naphthalimide derivatives with phenyl (1), benzyl (2), 3,4-dimethoxyphenyl ethyl (3), 4-pyridyl (4), 2-hydroxy ethyl (5), 4-pyridylmethyl (6) groups attached to the nitrogen atom are synthesized and characterized. Cyclic voltammograms of all these compounds show one-electron reversible redox cycle (-1.24 V to -1.18 V) due to formation of anion radicals. However, in the case of (5), quenching of this redox process occurs when polyhydroxy-aromatic compounds such as 1,3-dihydroxy benzene and 1,3,5-trihydroxybenzene are added. Copper complexes, namely bis-{N-(4-pyridylmethyl)1,8-naphthalimide}copper (II) perchlorate (8), bis-{N-(4-pyridylmethyl)1,8-naphthalimide}copper (II) perchlorate (9) and bis-{N-(4-pyridylmethyl)phthalimide} copper (II) perchlorate (10) are synthesized and characterised. The complexes (8) and (9) show reversible redox couple of the ligand without any significant interaction with the redox active copper (II) centre.

  8. Structural characterization of a new N-substituted pantothenamide bound to pantothenate kinases from Klebsiella pneumoniae and Staphylococcus aureus.

    Science.gov (United States)

    Hughes, Scott J; Antoshchenko, Tetyana; Kim, Kyung Phil; Smil, David; Park, Hee-Won

    2014-07-01

    Pantothenate kinase (PanK) is the rate-limiting enzyme in Coenzyme A biosynthesis, catalyzing the ATP-dependent phosphorylation of pantothenate. We solved the co-crystal structures of PanKs from Staphylococcus aureus (SaPanK) and Klebsiella pneumonia (KpPanK) with N-[2-(1,3-benzodioxol-5-yl)ethyl] pantothenamide (N354-Pan). Two different N354-Pan conformers interact with polar/nonpolar mixed residues in SaPanK and aromatic residues in KpPanK. Additionally, phosphorylated N354-Pan is found at the closed active site of SaPanK but not at the open active site of KpPanK, suggesting an exchange of the phosphorylated product with a new N354-Pan only in KpPanK. Together, pantothenamides conformational flexibility and binding pocket are two key considerations for selective compound design.

  9. Sequential coupling approach to the synthesis of nickel(II) complexes with N-aryl-2-amino phenolates.

    Science.gov (United States)

    Fuse, Shinichiro; Tago, Hiroaki; Maitani, Masato M; Wada, Yuji; Takahashi, Takashi

    2012-10-01

    A sequential multicomponent coupling approach is a powerful method for the construction of combinatorial libraries because structurally complex and diverse molecules can be synthesized from simple materials in short steps. In this paper, an efficient synthesis of nickel(II) complexes with N-aryl-2-amino phenols via a sequential three-step coupling approach is described, for potential use in nonlinear optical materials, bioinspired catalytic systems, and near-infrared absorbing filters. Seventeen N-aryl-2-amino phenolates were successfully synthesized in high yields based on the coupling of 3,5-di-tert-butylbenzene-1,2-diol with a pivotal aromatic scaffold, 4-bromo-2-iodo-aniline, followed by sequential Suzuki-Miyaura coupling with aryl boronates. A total of 16 analytically pure nickel(II) complexes with N-aryl-2-amino phenolates were obtained from 17 complexation trials. The procedure allowed us to assemble 4 components in high yields without protection, deprotection, oxidation or reduction steps. Various building blocks that included electron-donating, electron-withdrawing, and basic were used, and readily available, nontoxic and environmentally benign substrates and reagents were employed with no generation of toxic compounds. No strict anhydrous or degassed conditions were required. Absorption spectroscopic measurement of the synthesized nickel(II) complexes revealed that the ortho-substituent Ar(1) exerted more influence on the absorption wavelength of the complexes than the para-substituent Ar(2). On the other hand, both substituents Ar(1) and Ar(2) influenced the molar absorptivity values. These observations should be useful for the design of new and useful nickel(II) complexes as near-infrared chromophores.

  10. A Green and Facile Solid-state Synthesis Method for the Preparation of Diazenecarboxamide Azo Compounds with Potassium Ferricyanide and Sodium Hydroxide System

    Institute of Scientific and Technical Information of China (English)

    Wan Xin XUE; Jian Ping LI; Yu Lu WANG

    2004-01-01

    Eleven new-typed azo compounds were synthesized in good yields by dehydrogenating the corresponding aryl substituted semicarbazides using potassium ferricyanide and sodium hydroxide system under solid-state conditions.

  11. DBU-Promoted Trifluoromethylation of Aryl Iodides with Difluoromethyltriphenylphosphonium Bromide

    Institute of Scientific and Technical Information of China (English)

    Yun Wei; Liuying Yu; Jinhong Lin; Xing Zheng; Jichang Xiao

    2016-01-01

    DBU-promoted trifluoromethylation of aryl iodides with difluoromethyltriphenylphosphonium bromide (DFPB) in the presence of copper source is described.In this transformation,DBU not only acts as base to deprotonate the difluoromethyl group in DFPB to generate difluoromethylene phosphonium ylide Ph3P+CF2,but also converts the difluorocarbene generated from ylide Ph3P+CF2 into trifluoromethyl anion,finally resulting in the trifluoromethylation of aryl iodides.The reactions proceeded smoothly to afford expected products in moderate to good yields.

  12. Microwave Induced Synthesis of 3-Aryl-6-( 6-/8-substituted 4-chloroquinoline-3-yl) - s - triazolo [ 3,4- b ] - 1,3,4- thiadiazoles

    Institute of Scientific and Technical Information of China (English)

    QIAO,Ren-Zhong(乔仁忠); HUI,Xin-Ping(惠新平); XU,Peng-Fei(许鹏飞); ZHANG,Zi-Yi(张自义); CHENG,Dong-Liang(程东亮)

    2001-01-01

    The condensation of 4-amino-3-aryl-5-mercapto-1, 2, 4-tria-zoles (1a-f) with 6-/8-substituted 1,4-dihydro-4-oxo-quino-line-3-carboxylic acids (2a-d) in the presence of phosphorus oxychloride on refluxing or under microwave irradiation gave twenty four novel 3-aryl-6-(6-/8-substituted 4-chloroquinoline-3-yl)-s-triazolo[3,4-b]-1,3,4-thiadiazoles (4a-x), Consid-erable increase in the reaction rate has been observed with improved yields under microwave irradiation. The structures of the compounds synthesized were determined by elemental analyses, IR, 1H NMR and MS spectra. Their spectral properties and the reaction mechanism were also discussed. The preliminary biological test showed that some of compounds had moderate antibacterial activities.

  13. Pseudoephedrine-Directed Asymmetric α-Arylation of α-Amino Acid Derivatives.

    Science.gov (United States)

    Atkinson, Rachel C; Fernández-Nieto, Fernando; Mas Roselló, Josep; Clayden, Jonathan

    2015-07-27

    Available α-amino acids undergo arylation at their α position in an enantioselective manner on treatment with base of N'-aryl urea derivatives ligated to pseudoephedrine as a chiral auxiliary. In situ silylation and enolization induces diastereoselective migration of the N'-aryl group to the α position of the amino acid, followed by ring closure to a hydantoin with concomitant explulsion of the recyclable auxiliary. The hydrolysis of the hydantoin products provides derivatives of quaternary amino acids. The arylation avoids the use of heavy-metal additives, and is successful with a range of amino acids and with aryl rings of varying electronic character.

  14. Pd-NHC-Catalyzed Alkynylation of General Aryl Sulfides with Alkynyl Grignard Reagents.

    Science.gov (United States)

    Baralle, Alexandre; Yorimitsu, Hideki; Osuka, Atsuhiro

    2016-07-25

    Cross-coupling reactions of unactivated aryl sulfides with alkynylmagnesium chloride have been invented to afford 1-aryl-1-alkynes with the aid of a palladium/N-heterocyclic carbene complex. This reaction has by far the widest scope of all transformations utilizing aryl sulfides and alkynes, while known cross-coupling alkynylations of aryl-sulfur electrophiles require activated azaaryl sulfides, thiolactams, or arenesulfonyl chlorides. The alkynylation of aryl sulfides is compatible with typical protecting functional groups. The alkynylation is applied to the synthesis of benzofuran-based fluorescent molecules by taking advantage of characteristic organosulfur chemistry.

  15. Structural, spectroscopic, magnetic and electrochemical studies of monomer N-substituted-sulfanilamide copper (II) complex with 2,2'-bipyridine.

    Science.gov (United States)

    Öztürk, Filiz; Bulut, İclal; Bulut, Ahmet

    2015-03-05

    A novel copper (II) complex of sulfamethazine (4-amino-N-[4,6-dimethyl-2-pyrimidinyl] benzene sulfonamide, Hsmz) ([Cu(smz)2bipy]⋅0.8H2O; bipy: 2,2'-bipyridine) has been synthesized and characterized by single crystal X-ray diffraction, EPR, IR, UV-vis and electrochemical methods. The single crystal X-ray analysis indicated that the compound crystallizes in the monoclinic space group P21/c with Z=4. The central copper (II) ion is coordinated by two bidentate sulfamethazine anions through the nitrogen atoms together with one bidentate 2,2'-bipyridine ligand forming the octahedral geometry. The characteristic vibration bands support the X-ray analysis results. The EPR spectral analysis has led to that the ground state wave function of the unpaired electron of copper ion is [Formula: see text] ((2)B1g state) and also indicated that the metal ions are located in distorted octahedral sites (D4h) elongated along the z-axis. The electrochemical studies of the complex were also carried out to determine the active sites of the ligands. The cyclic and square wave voltammetric techniques have been used to determine the complex.

  16. Pd-NHC-Catalyzed Direct Arylation of 1,4-Disubstituted 1,2,3-Triazoles with Aryl Halides

    Institute of Scientific and Technical Information of China (English)

    何涛; 王敏; 李品华; 王磊

    2012-01-01

    A highly efficient method for the synthesis of unsymmetrical multi-substituted 1,2,3-triazoles via a direct Pd-NHC system catalyzed C(5)-arylation of 1,4-disubstituted triazoles, which are readily accessible via "click" chemistry has been developed. It is important to note that C--H bond functionalizations of 1,2,3-triazoles with a variety of differently substituted aryl iodides and bromides as electrophiles can be conveniently achieved through this catalytic system at significantly milder reaction temperatures of 100 ℃ under air.

  17. Ultrasound promoted and SiO2/CCl3COOH mediated synthesis of 2-aryl-1-arylmethyl-1-benzimidazole derivatives in aqueous media: An eco-friendly approach

    Indian Academy of Sciences (India)

    Brajesh Kumar; Kumari Smita; Brajendra Kumar; Luis Cumbal

    2014-11-01

    Ultrasonic irradiation is an efficient and innocuous technique of reagent activation for synthesizing organic compounds. First one-pot synthesis of 2-aryl-1-arylmethyl-1H- benzimidazole derivatives from o- phenylenediamine and an aromatic aldehyde in the presence of silica gel supported trichloroacetic acid (SiTCA) was carried out with excellent yields at 50°C by sonication. This method provided several advantages such as green solvent, inexpensive catalyst, simple experimental methodology, shorter reaction time and higher yield.

  18. Chelation in Metal Intoxication XLVI:Synthesis of Some α-Mercapto-β-Substituted Aryl Acrylic Acids and Their In vitro Cadmium Chelating Ability

    Institute of Scientific and Technical Information of China (English)

    MADHUMITA CHATTERJEE; VINOD K. DWIVEDI; KIRTI KHANDEKAR; SUSHIL K. TANDON

    2004-01-01

    Objective To synthesize some new α-mercapto-β-substituted aryl acrylic acids, characterize them and investigate their in vitro cadmium chelating ability. Methods Six α-mercapto-β-substituted aryl acrylic acids were prepared by the alkaline hydrolysis of 5-(aryl methylene)rhodanines, obtained from the condensation of substituted aldehydes and rhodanine following the reported procedure. The new compounds were characterized by elemental analysis, infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy. The liver and kidney from cadmium chloride pre-administered rats were homogenized and their nuclear mitochondrial fraction (NMF) and supernatant cytosol fraction (SCF) were separated. A measured volume of each fraction was dialyzed separately using "dialysis sack" against buffered-KCl medium containing a compound in the final concentration of 1×10-3 mol/L for 3 h at 37℃C. The whole content of "sack" was subjected to cadmiumestimation following digestion with conc. Nitric acid was detected using flame atomic absorption spectrometer. Results The in vitro screening showed that α-mercapto-β-(p-methoxyphenyl)acrylic acid (compound 2) and α-mercapto-β-(m-methoxy, p-hydroxyphenyl) acrylic acid (compound 4) were more effective than α-mercapto-β-thienyl acrylic acid (compound 1) and α-mercapto-β-(p-dimethylaminophenyl) acrylic acid (compound 3) in mobilizing cadmium as their dialyzable chelates. The presence of a methoxy group on the phenyl moiety (compounds 2 and 4) increases the metal chelating ability of mercapto acrylic acids. Conclusions Compounds 2 and 4 seem to have accessibility to the cellular system and capability of chelating-out the intracellularly bound cadmium.

  19. Design, synthesis, and biological activities of 1-aryl-1,4-diazepan-2-one derivatives as novel triple reuptake inhibitors.

    Science.gov (United States)

    Honda, Eiji; Ishichi, Yuji; Kimura, Eiji; Yoshikawa, Masato; Kanzaki, Naoyuki; Nakagawa, Hideyuki; Terao, Yasuko; Suzuki, Atsuko; Kawai, Takayuki; Arakawa, Yuuichi; Ohta, Hiroyuki; Terauchi, Jun

    2014-08-15

    A novel series of triple reuptake inhibitors were explored by ligand-based drug design. A cyclic structure was designed from cyclopropane derivative 5 using the core structure of reported monoamine reuptake inhibitors, leading to the formation of the 1-aryl-1,4-diazepan-2-one derivative 23j-S. Compound 23j-S was shown to act as a potent TRI with an excellent ADME-Tox profile. Oral administration of 23j-S significantly enhanced norepinephrine, dopamine, and serotonin levels in the mouse prefrontal cortex and showed significant antidepressant-like activity in tail suspension tests in mouse.

  20. Facile synthetic approach for 5-aryl-9-hydroxypyrano [3,2-f] indole-2(8H-one

    Directory of Open Access Journals (Sweden)

    Cheng Wang

    2016-11-01

    Full Text Available An appropriate method for the synthesis of 5-aryl-9-hydroxypyrano[3,2-f]indole-2(8H-one was described. The targeted compounds were obtained starting from vanillin via nine steps. Interestingly, in the final cyclization step, the intermediate 4-(2-halogeno phenyl-7-methoxy-1H-indole-6-yl propiolate could convert directly into the final product in one step reaction using PtCl4 or Pd(PPh34/trifluoroacetic acid as catalysts. The possible catalytic mechanism for PtCl4 and Pd(PPh34/trifluoroacetic acid was discussed.

  1. Discovery of an α-amino C-H arylation reaction using the strategy of accelerated serendipity.

    Science.gov (United States)

    McNally, Andrew; Prier, Christopher K; MacMillan, David W C

    2011-11-25

    Serendipity has long been a welcome yet elusive phenomenon in the advancement of chemistry. We sought to exploit serendipity as a means of rapidly identifying unanticipated chemical transformations. By using a high-throughput, automated workflow and evaluating a large number of random reactions, we have discovered a photoredox-catalyzed C-H arylation reaction for the construction of benzylic amines, an important structural motif within pharmaceutical compounds that is not readily accessed via simple substrates. The mechanism directly couples tertiary amines with cyanoaromatics by using mild and operationally trivial conditions.

  2. An Efficient Three Component One-Pot Synthesis of 5-Amino-7-aryl-7,8-dihydro-[1,2,4] triazolo[4,3-a]-pyrimidine-6-carbonitriles

    Directory of Open Access Journals (Sweden)

    Sun Wan-Fu

    2012-02-01

    Full Text Available A series of novel 5-amino-7-aryl-7,8-dihydro-[1,2,4] triazolo[4,3-a]-pyrimidine-6-carbonitriles were synthesized by a one-pot reaction of 3-amino-1,2,4-triazole, malononitrile and aryl aldehydes in the presence of 20 mol% NaOH in ethanol under heating or ultrasonic irradiation. The structures of the target compounds were confirmed by inspection of their 1H- NMR, 13C-NMR, IR and MS spectra. The advantages of this method are short reaction times, good yields, high selectivity and operational simplicity.

  3. Synthesis and antimicrobial evaluation of 5-aryl-1,2,4-triazole-3-thione derivatives containing a rhodanine moiety.

    Science.gov (United States)

    Li, Chao; Liu, Jia-Chun; Li, Ya-Ru; Gou, Cheng; Zhang, Mei-Ling; Liu, Hong-Yan; Li, Xiao-Zhen; Zheng, Chang-Ji; Piao, Hu-Ri

    2015-08-01

    Three series of 5-aryl-1,2,4-triazole-3-thione derivatives containing a rhodanine moiety (5a-k, 6a-i, and 7a-i) have been synthesized, characterized and evaluated for their antibacterial activity. Some of these displayed potent antibacterial activity against several Gram-positive and Gram-negative bacterial strains (including multidrug-resistant clinical isolates) with minimum inhibitory concentration (MIC) values in the range of 4-64 μg/mL and minimum bactericidal concentration (MBC) values in the range of 8-256 μg/mL. Compared with previously reported rhodanine derivatives, these compounds exhibited a broad spectrum of antibacterial activity by means of introducing 4-amino-5-aryl-1,2,4-triazole-3-thione moiety. Notably, compound 5f exhibited good antibacterial activity against Staphylococcus aureus RN 4220, S. aureus 209, S. aureus 503, Gram-negative bacteria (Escherichia coli 1924), and Candida albicans 7535 with MBC values of 8 or 16 μg/ml. All of the compounds synthesized in the current Letter were characterized by (1)H NMR, (13)C NMR, infrared and mass spectroscopy.

  4. Amberlyst-15 catalyzed synthesis of alkyl/aryl/heterocyclic phosphonates

    Institute of Scientific and Technical Information of China (English)

    U.M. Rao Kunda; V.N. Reddy Mudumala; C.S. Reddy Gangireddy; B.R. Nemallapudi; K.N. Sandip; S.R. Cirandur

    2011-01-01

    A novel and efficient procedure for the synthesis of alkyl phosphonates through one pot condensation of alkyl halide and tri-alkyl/aryl phosphite in the presence of Amberlyst-15 as catalyst under solvent free conditions was applied. It demonstrated several advantages such as good yields of products, simple operation, convenient separation and inexpensive catalyst.

  5. Rh-Catalyzed arylation of fluorinated ketones with arylboronic acids.

    Science.gov (United States)

    Dobson, Luca S; Pattison, Graham

    2016-09-25

    The Rh-catalyzed arylation of fluorinated ketones with boronic acids is reported. This efficient process allows access to fluorinated alcohols in high yields under mild conditions. Competition experiments suggest that difluoromethyl ketones are more reactive than trifluoromethyl ketones in this process, despite their decreased electronic activation, an effect we postulate to be steric in origin.

  6. Oxidative electrochemical aryl C-C coupling of spiropyrans

    NARCIS (Netherlands)

    Ivashenko, Oleksii; van Herpt, Jochem T.; Rudolf, Petra; Feringa, Ben L.; Browne, Wesley R.

    2013-01-01

    The isolation and definitive assignment of the species formed upon electrochemical oxidation of nitro-spiropyran (SP) is reported. The oxidative aryl C-C coupling at the indoline moiety of the SP radical cation to form covalent dimers of the ring-closed SP form is demonstrated. The coupling is block

  7. Aminoarenethiolate-Copper(I)-Catalyzed Amination of Aryl Bromides

    NARCIS (Netherlands)

    Jerphagnon, Thomas; Klink, Gerard P.M. van; Vries, Johannes G. de; Koten, Gerard van

    2005-01-01

    Aminoarenethiolate-copper(I) complexes are known to be efficient catalysts for carbon-carbon bond formation. Here, we show the first examples that these thiolate-copper(I) complexes are efficient for carbon-nitrogen bond formation reactions as well. N-Arylation of benzylamine and imidazole with brom

  8. Kinetic Resolution of Aryl Alkenylcarbinols Catalyzed by Fc-PIP

    Institute of Scientific and Technical Information of China (English)

    胡斌; 孟萌; 姜山山; 邓卫平

    2012-01-01

    An effective kinetic resolution of a variety of aryl alkenylcarbinols catalyzed by nonenzymatic acyl transfer catalyst Fe-PIP was developed, affording corresponding unreacted alcohols in good to excellent ee value up to 99% and with selectivity factors up to 24.

  9. Synthesis and properties of poly(sulfone-arylate) copolymers

    NARCIS (Netherlands)

    Stephen, Ranimol; Gibon, Cécile M.; Weber, Martin; Gaymans, Reinoud J.

    2009-01-01

    Poly(sulfone-arylate) was synthesized in a reaction between dihydroxy polysulfone prepolymers and either diphenyl terephthalate or terephthaloyl chloride. The dihydroxy polysulfone prepolymers had molecular weights of 2000 and 4000 g/mol. The polymerization with diphenyl terephthalate was carried ou

  10. Characterization of natural aryl hydrocarbon receptor agonists from cassia seed and rosemary.

    Science.gov (United States)

    Amakura, Yoshiaki; Yoshimura, Morio; Takaoka, Masashi; Toda, Haruka; Tsutsumi, Tomoaki; Matsuda, Rieko; Teshima, Reiko; Nakamura, Masafumi; Handa, Hiroshi; Yoshida, Takashi

    2014-04-17

    Many recent studies have suggested that activation of the aryl hydrocarbon receptor (AhR) reduces immune responses, thus suppressing allergies and autoimmune diseases. In our continuing study on natural AhR agonists in foods, we examined the influence of 37 health food materials on the AhR using a reporter gene assay, and found that aqueous ethanol extracts of cassia seed and rosemary had particularly high AhR activity. To characterize the AhR-activating substances in these samples, the chemical constituents of the respective extracts were identified. From an active ethyl acetate fraction of the cassia seed extract, eight aromatic compounds were isolated. Among these compounds, aurantio-obtusin, an anthraquinone, elicited marked AhR activation. Chromatographic separation of an active ethyl acetate fraction of the rosemary extract gave nine compounds. Among these compounds, cirsimaritin induced AhR activity at 10-10² μM, and nepitrin and homoplantagenin, which are flavone glucosides, showed marked AhR activation at 10-10³ μM.

  11. Synthesis, Biological Evaluation and Molecular Docking Studies of 6-Aryl-2-Styrylquinazolin-4(3H-Ones

    Directory of Open Access Journals (Sweden)

    Emmanuel Ndubuisi Agbo

    2015-12-01

    Full Text Available Suzuki-Miyaura cross-coupling of 6-bromo-2-styrylquinazolin-4(3H-ones with arylboronic acids afforded a series of novel 6-aryl-2-styrylquinazolin-4(3H-ones. These compounds were evaluated for potential anticancer properties against the human renal (TK-10, melanoma (UACC-62 and breast cancer (MCF-7 cell lines. Their antimicrobial properties were also evaluated against six Gram-positive and four Gram-negative bacteria, as well as two strains of fungi. Molecular docking studies (in silico were conducted on compounds 5a, b, d and 6a, b, d–f to recognize the hypothetical binding motif of the title compounds within the active site of the dihydrofolate reductase and thymidylate synthase enzymes.

  12. A novel dihydropyridine with 3-aryl meta-hydroxyl substitution blocks L-type calcium channels in rat cardiomyocytes

    Energy Technology Data Exchange (ETDEWEB)

    Galvis-Pareja, David [Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas and Facultad Medicina, Universidad de Chile, Santiago (Chile); Centro Estudios Moleculares de la Célula (CEMC), Facultad de Ciencias Químicas y Farmacéuticas and Facultad Medicina, Universidad de Chile, Santiago (Chile); Zapata-Torres, Gerald [Departamento de Química Inorgánica y Analítica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago (Chile); Hidalgo, Jorge [Centro Estudios Moleculares de la Célula (CEMC), Facultad de Ciencias Químicas y Farmacéuticas and Facultad Medicina, Universidad de Chile, Santiago (Chile); Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago (Chile); Ayala, Pedro [Centro Estudios Moleculares de la Célula (CEMC), Facultad de Ciencias Químicas y Farmacéuticas and Facultad Medicina, Universidad de Chile, Santiago (Chile); and others

    2014-08-15

    Rationale: Dihydropyridines are widely used for the treatment of several cardiac diseases due to their blocking activity on L-type Ca{sup 2+} channels and their renowned antioxidant properties. Methods: We synthesized six novel dihydropyridine molecules and performed docking studies on the binding site of the L-type Ca{sup 2+} channel. We used biochemical techniques on isolated adult rat cardiomyocytes to assess the efficacy of these molecules on their Ca{sup 2+} channel-blocking activity and antioxidant properties. The Ca{sup 2+} channel-blocking activity was evaluated by confocal microscopy on fluo-3AM loaded cardiomyocytes, as well as using patch clamp experiments. Antioxidant properties were evaluated by flow cytometry using the ROS sensitive dye 1,2,3 DHR. Results: Our docking studies show that a novel compound with 3-OH substitution inserts into the active binding site of the L-type Ca{sup 2+} channel previously described for nitrendipine. In biochemical assays, the novel meta-OH group in the aryl in C4 showed a high blocking effect on L-type Ca{sup 2+} channel as opposed to para-substituted compounds. In the tests we performed, none of the molecules showed antioxidant properties. Conclusions: Only substitutions in C2, C3 and C5 of the aryl ring render dihydropyridine compounds with the capacity of blocking LTCC. Based on our docking studies, we postulate that the antioxidant activity requires a larger group than the meta-OH substitution in C2, C3 or C5 of the dihydropyridine ring. - Highlights: • Dihydropyridine (DHP) molecules are widely used in cardiovascular disease. • DHPs block Ca{sup 2+} entry through LTCC—some DHPs have antioxidant activity as well. • We synthesized 6 new DHPs and tested their Ca{sup 2+} blocking and antioxidant activities. • 3-Aryl meta-hydroxyl substitution strongly increases their Ca{sup 2+} blocking activity. • 3-Aryl meta-hydroxyl substitution did not affect the antioxidant properties.

  13. Binding of Estrogenic Compounds to Recombinant Estrogen Receptor-α: Application to Environmental Analysis

    OpenAIRE

    Pillon, Arnaud; Boussioux, Anne-Marie; Escande, Aurélie; Aït-Aïssa, Sélim; Gomez, Elena; Fenet, Hélène; Ruff, Marc; Moras, Dino; Vignon, Françoise; Duchesne, Marie-Josèphe; Casellas, Claude; Nicolas, Jean-Claude; Balaguer, Patrick

    2004-01-01

    Estrogenic activity in environmental samples could be mediated through a wide variety of compounds and by various mechanisms. High-affinity compounds for estrogen receptors (ERs), such as natural or synthetic estrogens, as well as low-affinity compounds such as alkylphenols, phthalates, and polychlorinated biphenyls are present in water and sediment samples. Furthermore, compounds such as polycyclic aromatic hydrocarbons, which do not bind ERs, modulate estrogen activity by means of the aryl ...

  14. Synthesis of N-(4-aryl-1-piperazinylbutyl)-substituted 7,8-benzo-1,3-diazaspiro[4,5]decane-2,4-dione derivatives with potential anxiolytic activity.

    Science.gov (United States)

    Kossakowski, J; Zawadowski, T; Turło, J; Kleps, J

    1998-02-01

    Continuing our studies connected with the design of new anxiolytics we have now synthesized a series of new compounds, derivatives of 7,8-benzo-1,3-diazaspiro[4,5]decane-2,4-dione bearing a 4-aryl-1-piperazinylbutyl group attached to the imide nitrogen. One single compound was submitted to the 5-HT1A receptor binding assay and found to display the expected--though rather weak--receptorial affinity.

  15. Synthesis, Characterization, and Biological Studies of Binuclear Copper(II Complexes of (2E-2-(2-Hydroxy-3-Methoxybenzylidene-4N-Substituted Hydrazinecarbothioamides

    Directory of Open Access Journals (Sweden)

    P. Murali Krishna

    2013-01-01

    Full Text Available Four novel binuclear copper(II complexes [1–4] of (2E-2-(2-hydroxy-3-methoxybenzylidene-4N-substituted hydrazinecarbothioamides, (OH(OCH3C6H4CH=NNHC(SNHR, where R = H (L1, Me (L2, Et (L3, or Ph (L4, have been synthesized and characterized. The FT-IR spectral data suggested the attachment of copper(II ion to ligand moiety through the azomethine nitrogen, thioketonic sulphur, and phenolic-O. The spectroscopic characterization indicates the dissociation of dimeric complex into mononuclear [Cu(LCl] units in polar solvents like DMSO, where L is monoanionic thiosemicarbazone. The DNA binding properties of the complexes with calf thymus (CT DNA were studied by spectroscopic titration. The complexes show binding affinity to CT DNA with binding constant (Kb values in the order of 106 M−1. The ligands and their metal complexes were tested for antibacterial and antifungal activities by agar disc diffusion method. Except for complex 4, all complexes showed considerable activity almost equal to the activity of ciprofloxacin. These complexes did not show any effect on Gram-negative bacteria, whereas they showed moderate activity for Gram-positive strains.

  16. Comparative effects of indole and aminoacetonitrile derivatives on dimethylnitrosamine-demethylase and aryl hydrocarbon hydroxylase activities.

    Science.gov (United States)

    Arcos, J C; Myers, S C; Neuburger, B J; Argus, M F

    1980-04-01

    The effect of in vivo administration of indole and five 3-indolyl derivatives including L-tryptophan, as well as of aminoacetonitrile and 3 of its derivatives, were studied on the carcinogen-metabolizing hepatic mixed-function oxidases dimethylnitrosamine (DMN)-demethylase I and II and aryl hydrocarbon hydroxylase (AHH). Indole, 3-indolylmethanol, 3-indolyl-acetonitrile, 3-indolylacetone and L-tryptophan induce AHH activity from 3- to 6-fold of the control level, whereas beta-3-indolylethanol has no effect; the latter compound produces a 21% decrease of the endoplasmic reticulum content in the tissue. Only L-tryptophan induces DMN-demethylase I and only L-tryptophan and 3-indolylmethanol induce DMN-demethylase II, representing a doubling of enzyme activity in all 3 instances. Aminoacetonitrile is a potent repressor of DMN-demethylase I. Substitutions on the amino group bring about strong decrease or abolishment of mixed-function oxidase repressor activity; thus, iminodiacetonitrile has only about 1/5th the repressor activity of the parent compound, whereas nitrilotriacetonitrile and dimethylaminoacetonitrile appear to be inactive. Aminoacetonitrile and its derivatives studied have no effect on DMN-demethylase II and AHH activities. The mixed-function oxidase-modifying effects of the indole compounds and of aminoacetonitrile and its derivatives illustrate the potential complexity of effects of dietary constituents on the carcinogenic responses.

  17. Palladium-catalyzed direct arylation and cyclization of o-iodobiaryls to a library of tetraphenylenes

    Science.gov (United States)

    Zhu, Chendan; Zhao, Yue; Wang, Di; Sun, Wei-Yin; Shi, Zhuangzhi

    2016-09-01

    Aryl–aryl bond formation constitutes one of the most important subjects in organic synthesis. The recent developments in direct arylation reactions forming aryl–aryl bond have emerged as very attractive alternatives to traditional cross-coupling reactions. Here, we describe a general palladium-catalyzed direct arylation and cyclization of o-iodobiaryls to build a library of tetraphenylenes. This transformation represents one of the very few examples of C-H activation process that involves simultaneous formation of two aryl–aryl bonds. Oxygen plays a vital role by ensuring high reactivity, with air as the promoter furnished the best results. We anticipate this ligand-free and aerobic catalytic system will simplify the synthesis of tetraphenylenes as many of the reported methods involve use of preformed organometallic reagents and will lead to the discovery of highly efficient new direct arylation process.

  18. Acylmethyl(aryl)tellurium(IV,II) derivatives: intramolecular secondary bonding and steric rigidity.

    Science.gov (United States)

    Chauhan, Ashok K S; Singh, Puspendra; Srivastava, Ramesh C; Duthie, Andrew; Voda, Andreea

    2008-08-14

    Electrophilic substitution of acylmethanes (methyl ketones), RCOCH3 (R = i-Pr, 1; Et, 2; Me, 3) with aryltellurium trichlorides, ArTeCl3 (Ar = 1-C10H7, Np, A; 2,4,6-Me3C6H2, Mes, B; 4-MeOC6H4, Anisyl, C) under mild conditions affords the corresponding acylmethyl(aryl)tellurium dichlorides (RCOCH2)ArTeCl2. Reduction of the dichlorides, gives tellurides, (i-PrCOCH2)ArTe, 1A-1C, which give the corresponding dihalides, (i-PrCOCH2)ArTeX2 (X = Cl, 1Aa-1Ca; Br, 1Ab-1Cb; I, 1Ac-1Cc) when reacted in situ with SO2Cl2, Br2 or I2. The unsymmetric tellurides are labile towards disproportionation and attempts to obtain them lead to the isolation of Ar2Te2 except in the case of (i-PrCOCH2)MesTe (1B), which represents an interesting example of a kinetically stable aryl(alkyl)telluride. All the dihalomesityltellurium(IV) derivatives show separate 1H and 13C NMR signals for the ortho methyls irrespective of the sizes of R and X ligands. The telluride, 1B with free rotation about Te-C(mesityl) bond shows, like the unsymmetric diorganotellurium(IV) dihalides, only one 125Te NMR signal. The 1,4-chelating behavior of the acyl ligand among diorganotellurium(IV) compounds is inferred from the X-ray diffraction data for 1Aa, 1Ac, 1Ba, 1Bb, 1cA and 1Cc which are indicative of the presence of intramolecular Te...O secondary bonding interactions (SBIs) at least in the solid state. As a consequence, steric repulsion in case of the mesityltellurium(IV) derivatives, 1Ba and 1Bb, reaches the threshold so as to cause loss of two-fold rotational symmetry of the mesityl group about the Te-C(mesityl) bond axis. Intermolecular C-HO...O H-bonding interactions appears to stabilize such an orientation of the aryl ligand at least in the solid state.

  19. Synthesis of Schiff Bases of 2-amino-5-aryl-1,3,4-thiadiazole and Its Analgesic, Anti-Inflammatory and Anti-Bacterial Activity

    Directory of Open Access Journals (Sweden)

    Alok Pandey

    2012-01-01

    Full Text Available Schiff Bases of 2-amino-5-aryl-1,3,4-thiadiazole derivatives have been synthesized with different aromatic aldehyde. 1,3,4-thiadiazole derivatives were prepared by the reaction of thiosemicarbazide, sodium acetate and aromatic aldehyde. The structures of the titled Schiff bases were elucidated by IR and 1H NMR spectral measurements. All the compounds were evaluated for their analgesic activity against swiss albino mice, anti-inflammatory activity against Wister albino rats. The compounds showed significant antibacterial activity against Staphylococcus aureus (gram-positive bacteria and E. coli (gram-negative bacteria.

  20. Cul/8-Hydroxyquinalidine Promoted N-Arylation of Indole and Azoles

    Institute of Scientific and Technical Information of China (English)

    杨新业; 邢辉; 张烨; 赖宜生; 张奕华; 蒋咏文; 马大为

    2012-01-01

    An efficient catalytic system of CuI/8-hydroxyquinalidine was developed for the coupling of aryl iodides and indole as well as some azoles. The reaction could be carried out at 90 ~C under the condition of relatively low cata- lyst loading, affording various N-arylindoles and N-aryl azoles in good yields. The functionalized and hindered aryl iodides were suitable substrates for this transformation.

  1. Nickel-catalyzed cross-coupling of aryl phosphates with arylboronic acids.

    Science.gov (United States)

    Chen, Hu; Huang, Zhongbin; Hu, Xiaoming; Tang, Guo; Xu, Pengxiang; Zhao, Yufen; Cheng, Chien-Hong

    2011-04-01

    The Suzuki-Miyaura cross-coupling of aryl phosphates using Ni(PCy(3))(2)Cl(2) as an inexpensive, bench-stable catalyst is described. Broad substrate scope and high efficiency are demonstrated by the syntheses of more than 40 biaryls and by constructing complex organic molecules. The poor reactivity of aryl phosphates relative to aryl halides is successfully employed to construct polyarenes by selective cross-coupling using Pd and Ni catalysts.

  2. Aryl Hydrocarbon Receptor and Breast Cancer%芳香烃受体与乳腺癌

    Institute of Scientific and Technical Information of China (English)

    胡蕾蕾

    2011-01-01

    The aryl hydrocarbon receptor ( AhR ) is a ligand-activated transcription factor,which mediates the activity of polycyclic aromatic hydrocarbons and is involved in some important biological processes.The AhRin complex with its binding partner aryl hydrocarbon receptor nuclear translocator,mediates the cellular response to xenobiotic compounds such as the environmental pollutant dioxin.Recent researches showed that AhR might promote the development of breast cancer via a variety of approaches and the inhibitory AhR-ER cross-alk may explain why the breast cancer caused by chemical carcinogens is still estrogen receptor-positive.%芳香烃受体(AhR)是一种配体依赖性激活的转录因子,可介导多环芳烃类化合物的毒性反应(包括致毒性),还参与一些重要的生物学过程.AhR与芳香烃受体核转位蛋白结合,促使对异生型物质如环境污染物二口 恶英作出反应.近年来的研究发现,AhR可能通过多种途径在乳腺癌的发生、发展中起作用,其中AhR与雌激素受体的抑制性交互应答可能解释为什么乳腺癌仍为激素敏感性乳腺癌,尤其是化学致癌物为主导的乳腺癌.

  3. Palladium-catalyzed α-arylation of benzylic phosphine oxides.

    Science.gov (United States)

    Montel, Sonia; Jia, Tiezheng; Walsh, Patrick J

    2014-01-03

    A novel approach to prepare diarylmethyl phosphine oxides from benzyl phosphine oxides via deprotonative cross-coupling processes (DCCP) is reported. The optimization of the reaction was guided by High-Throughput Experimentation (HTE) techniques. The Pd(OAc)2/Xantphos-based catalyst enabled the reaction between benzyl diphenyl or dicyclohexyl phosphine oxide derivatives and aryl bromides in good to excellent yields (51-91%).

  4. Palladium- (and nickel-) catalyzed vinylation of aryl halides†

    OpenAIRE

    DENMARK, SCOTT E.; Butler, Christopher R.

    2008-01-01

    Functionalized styrenes are extremely useful building blocks for organic synthesis and for functional polymers. One of the most general syntheses of styrenes involves the combination of an aryl halide with a vinyl organometallic reagent under catalysis by palladium or nickel complexes. This Feature Article provides the first comprehensive summary of the vinylation methods currently available along with a critical comparison of the efficiency, cost and scope of the methods.

  5. Synthesis and characterization of 5-heteroarylsulfanyl-4-aryl-1,2,3-selena/thiadiazoles

    Indian Academy of Sciences (India)

    Ramaiyan Manikannan; Masilamani Shanmugaraja; Seetharaman Manojveer; Shanmugam Muthusubramanian

    2012-03-01

    Synthesis and spectral characterization of 2-methyl-5-[(4-aryl-1,2,3-selenadiazol-5-yl)sulfanyl]-1,3,4-thiadiazoles, 5-[4-aryl-1,2,3-selenadiazol-5-yl]sulfanyl-1-phenyl-1-1,2,3,4-tetraazoles, 4-aryl-5-[(5-methyl-1,3,4-thiadiazol-2-yl)sulfanyl]-1,2,3-thiadiazole and 5-[4-aryl-1,2,3-thiadiazol-5-yl]sulfanyl-1-phenyl-1-1,2,3,4-tetraazole have been reported.

  6. Synthesis of novel aryl(heteroaryl)sulfonyl ureas of possible biological interest.

    Science.gov (United States)

    Saczewski, Franciszek; Kuchnio, Anna; Samsel, Monika; Łobocka, Marta; Kiedrowska, Agnieszka; Lisewska, Karolina; Saczewski, Jarosław; Gdaniec, Maria; Bednarski, Patrick J

    2010-02-26

    The course of reaction of aryl and heteroaryl sulfonamides with diphenylcarbonate (DPC) and 4-dimethylaminopyridine (DMAP) was found to depend on the pKa of the sulfonamide used. Aryl sulfonamides with pKa approximately 10 gave 4-dimethylamino-pyridinium arylsulfonyl-carbamoylides, while the more acidic heteroaryl sulfonamides (pKa approximately 8) furnished 4-dimethylaminopyridinium heteroarylsulfonyl carbamates. Both the carbamoylides and carbamate salts reacted with aliphatic and aromatic amines with the formation of appropriate aryl(heteroaryl)sulfonyl ureas, and therefore, can be regarded as safe and stable substitutes of the hazardous and difficult to handle aryl(heteroaryl)sulfonyl isocyanates.

  7. Synthesis of Novel Aryl(heteroarylsulfonyl Ureas of Possible Biological Interest

    Directory of Open Access Journals (Sweden)

    Maria Gdaniec

    2010-02-01

    Full Text Available The course of reaction of aryl and heteroaryl sulfonamides with diphenylcarbonate (DPC and 4-dimethylaminopyridine (DMAP was found to depend on the pKa of the sulfonamide used. Aryl sulfonamides with pKa ~ 10 gave 4-dimethylamino-pyridinium arylsulfonyl-carbamoylides, while the more acidic heteroaryl sulfonamides (pKa ~ 8 furnished 4-dimethylaminopyridinium heteroarylsulfonyl carbamates. Both the carbamoylides and carbamate salts reacted with aliphatic and aromatic amines with the formation of appropriate aryl(heteroarylsulfonyl ureas, and therefore, can be regarded as safe and stable substitutes of the hazardous and difficult to handle aryl(heteroarylsulfonyl isocyanates.

  8. Porphyrin Cobalt(III) "Nitrene Radical" Reactivity; Hydrogen Atom Transfer from Ortho-YH Substituents to the Nitrene Moiety of Cobalt-Bound Aryl Nitrene Intermediates (Y = O, NH).

    Science.gov (United States)

    Goswami, Monalisa; Rebreyend, Christophe; de Bruin, Bas

    2016-02-20

    In the field of cobalt(II) porphyrin-catalyzed metallo-radical reactions, organic azides have emerged as successful nitrene transfer reagents. In the pursuit of employing ortho-YH substituted (Y = O, NH) aryl azides in Co(II) porphyrin-catalyzed nitrene transfer reactions, unexpected hydrogen atom transfer (HAT) from the OH or NH₂ group in the ortho-position to the nitrene moiety of the key radical-intermediate was observed. This leads to formation of reactive ortho-iminoquinonoid (Y = O) and phenylene diimine (Y = NH) species. These intermediates convert to subsequent products in non-catalyzed reactions, as is typical for these free organic compounds. As such, the observed reactions prevent the anticipated cobalt-mediated catalytic radical-type coupling of the nitrene radical intermediates to alkynes or alkenes. Nonetheless, the observed reactions provide valuable insights into the reactivity of transition metal nitrene-radical intermediates, and give access to ortho-iminoquinonoid and phenylene diimine intermediates from ortho-YH substituted aryl azides in a catalytic manner. The latter can be employed as intermediates in one-pot catalytic transformations. From the ortho-hydroxy aryl azide substrates both phenoxizinones and benzoxazines could be synthesized in high yields. From the ortho-amino aryl azide substrates azabenzene compounds were obtained as the main products. Computational studies support these observations, and reveal that HAT from the neighboring OH and NH₂ moiety to the nitrene radical moiety has a low energy barrier.

  9. Synthesis, computational studies and preliminary pharmacological evaluation of 2-[4-(aryl substituted piperazin-1-yl]-N-benzylacetamides as potential antipsychotics

    Directory of Open Access Journals (Sweden)

    Sushil Kumar

    2016-11-01

    Full Text Available A series of 2-[4-(aryl substituted piperazin-1-yl]-N-benzylacetamides were synthesized and the target compounds (3a–j were evaluated for atypical antipsychotic activity by studying apomorphine induced climbing behavior, 5-HTP induced head twitches behavior and catalepsy in mice. The physicochemical similarity of the target compounds with respect to standard drugs clozapine, ketanserin and risperidone was assessed by calculating from a set of physicochemical properties using software programs. The test compounds (3a–j demonstrated good similarity values with respect to the standard drugs. Among them, compound 3b has emerged as an important lead compound showing potential atypical antipsychotic-like profile.

  10. Synthesis of a new N-substituted bis-benzimidazolyl diamide ligand and its trinuclear copper(II) complex: structural and fluorescence studies.

    Science.gov (United States)

    Mahiya, Kuldeep; Mathur, Pavan

    2013-09-01

    The synthesis of a new N-substituted fluorescent probe based on a bis-benzimidazole diamide N(2),N(2')-bis[(1-(4-methylbenzyl)-benzimidazol-2-yl)methyl]biphenyl-2,2'-dicarboxamide (L1) with a biphenyl spacer group and its trinuclear copper(II) complex [Cu3(L1)3Cl3]·3Cl·3H2O] has been described. X-ray studies shows that the trinuclear complex crystallizes as [{Cu3(L1)3Cl3}2·6Cl·13CH3CN·2H2O] in triclinic space group P-1 with two independent molecules in the asymmetric unit. Each copper(II) adopts a distorted penta-coordinated geometry in each unit. The fluorescence spectra of L1 in methanol show an emission band centered at 300 nm. This band arises due to benzimidazolyl moiety in the ligating system. The diamide L1 in the presence of Fe(3+) show the simultaneous 'quenching' of (300nm) and 'enhancement' of (375 nm) emission band. The new emission band at 375 nm is attributed to intra ligand π-π(*) transition of the biphenyl moiety. While Cu(2+) and Ag(+) show only the quenching of the 300 nm band. No such behavior was observed with other metal ions like Ni(2+), Co(2+), Mn(2+), Mg(2+), Zn(2+) and Pb(2+). The quenching constant with Fe(3+), Ag(+) and Cu(2+) are calculated by the Stern-Volmer plots.

  11. Synthesis of 2-aryl-1,2,4-oxadiazolo-benzimidazoles: Tubulin polymerization inhibitors and apoptosis inducing agents.

    Science.gov (United States)

    Kamal, Ahmed; Reddy, T Srinivasa; Vishnuvardhan, M V P S; Nimbarte, Vijaykumar D; Subba Rao, A V; Srinivasulu, Vunnam; Shankaraiah, Nagula

    2015-08-01

    A new series of 2-aryl 1,2,4-oxadiazolo-benzimidazole conjugates have been synthesized and evaluated for their antiproliferative activity in the sixty cancer cell line panel of the National Cancer Institute (NCI). Compounds 5l (NSC: 761109/1) and 5x (NSC: 761814/1) exhibited remarkable cytotoxic activity against most of the cancer cell lines in the one dose assay and were further screened at five dose concentrations (0.01, 0.1, 1, 10 and 100 μM) which showed GI50 values in the range of 0.79-28.2 μM. Flow cytometric data of these compounds showed increased cells in G2/M phase, which is suggestive of G2/M cell cycle arrest. Further, compounds 5l and 5x showed inhibition of tubulin polymerization and disruption of the formation of microtubules. These compounds induce apoptosis by DNA fragmentation and chromatin condensation as well as by mitochondrial membrane depolarization. In addition, structure activity relationship studies within the series are also discussed. Molecular docking studies of compounds 5l and 5x into the colchicine-binding site of the tubulin, revealed the possible mode of interaction by these compounds.

  12. Synthesis and Thermal Crosslinking Behavior of Poly(aryl ether ketone)s Containing 1,4-Naphthalene Moieties

    Institute of Scientific and Technical Information of China (English)

    NIU Ya-ming; ZHANG Yun-he; CHEN Xing-bo; WANG Gui-bin; JIANG Zhen-hua

    2005-01-01

    A new monomer, 1,4-bis(4-fluorobenzoyl) naphthalene(compound 2) was synthesized via a two-step reaction. 1,4-Naphthalenedicarboxylic acid chloride(compound 1) was prepared by using the acyl chlorization reaction of 1,4-naphthalenedicarboxylic acid with thionyl chloride. The Friedel-Crafts acylation of compound 1 with fluorobenzene afforded compound 2 in a 80% yield. The polycondensation of compound 2 with various bisphenols in tetramethylene sulfone(TMS) in the presence of excess potassium carbonate as a condensation reagent was carried out at 210 ℃ to quantitatively afford the corresponding poly(aryl ether ketone)s(compounds 3_8) containing 1,4-naphthalene moieties. Thermal analyses showed that the polymers have Tg values ranging from 496 to 500 K and are thermally stable in air with initial mass loss above 500 ℃. These novel polymers exhibited an excellent solubility in organic solvents including NMP, DMAc, and chloroform, etc. In addition, the glass transition temperatures of these polymers increased and the polymers became insoluble in chloroform after treated at 260 ℃, indicating the occurrence of a thermal crosslinking reaction.

  13. New Synthesis and Antiparasitic Activity of Model 5-Aryl-1-methyl-4-nitroimidazoles

    Directory of Open Access Journals (Sweden)

    Mustafa M. El-Abadelah

    2009-07-01

    Full Text Available A number of 5-aryl-1-methyl-4-nitroimidazoles 5a-f have been synthesized in good yields by the Suzuki coupling reaction between 5-chloro-1-methyl-4-nitroimidazole (3 and arylboronic acids 4a-f, aided by dichlorobis-(triphenylphosphinepalladium(II, K2CO3, and tetrabutylammonium bromide in water at 70-80 °C. Compounds 5a-f were characterized by elemental analysis, NMR and MS spectral data. On the basis of in vitro screening data, 5-(3-chlorophenyl-1-methyl-4-nitro-1H-imidazole (5fexhibited potent lethal activity against Entamoeba histolytica and Giardia intestinalis with IC50 = 1.47 µM/mL, a value lower by a factor of two than that of the standard drug, metronidazole. The boosted activity of 5f was not accompanied by any increased cytotoxicity.The rest of the series also exhibited potent antiparasitic activity with IC50 valuesin the 1.72-4.43 µM/mL range. The cytotoxicity of the derivatives 5c and 5e was increased compared to the precursor compound, metronidazole, although they remain non-cytotoxic at concentrations much higher than the antiparasitic concentration of the two derivatives.

  14. Anthocyans fail to suppress transformation of aryl hydrocarbon receptor induced by dioxin.

    Science.gov (United States)

    Mukai, Rie; Fukuda, Itsuko; Hosokawa, Keizo; Nishiumi, Shin; Kaneko, Atsushi; Ashida, Hitoshi

    2005-05-01

    Dioxins induce adverse effects through transformation of the cytosolic aryl hydrocarbon receptor (AhR). Our previous study found that flavones and flavonols at dietary levels suppress AhR transformation. In the present study, we investigated whether 20 anthocyans dissolved in trifluoroacetic acid (TFA)-MeOH suppressed AhR transformation in a cell-free system and in Hepa-1c1c7 cells. Although four compounds at 50 muM suppressed 0.1 nM 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-induced AhR transformation and their effects were dose-dependent in the cell-free system, they were ineffective at 0.5 muM, which is close to physiological concentration. Moreover, no anthocyan at 50 muM tested here suppressed 0.1 nM TCDD-induced AhR transformation in Hepa-1c1c7 cells. We also confirmed that protocatechuic acid and related compounds, which are possible metabolites of anthocyans, did not affect the transformation in the cell-free system. It is concluded that anthocyans are not suitable candidates for protection from dioxin toxicity.

  15. Microwave Assisted Condensation Reactions of 2-Aryl Hydrazonopropanals with Nucleophilic Reagents and Dimethyl Acetylenedicarboxylate

    Directory of Open Access Journals (Sweden)

    Rita M. Borik

    2007-08-01

    Full Text Available The reaction of methyl ketones 1a-g with dimethylformamide dimethylacetal (DMFDMA afforded the enaminones 2a-g, which were coupled with diazotized aromatic amines 3a,b to give the corresponding aryl hydrazones 6a-h. Condensation of compounds 6a-h with some aromatic heterocyclic amines afforded iminoarylhydrazones 9a-m. Enaminoazo compounds 12a,b could be obtained from condensation of 6c with secondary amines. The reaction of 6e,h with benzotriazolylacetone yielded 14a,b. Also, the reaction of 6a,b,d-f,h with glycine and hippuric acid in acetic anhydride afforded pyridazinone derivatives 17a-f. Synthesis of pyridazine carboxylic acid derivatives 22a,b from the reaction of 6b,e with dimethyl acetylenedicarboxylate (DMAD in the presence of triphenylphosphine at room temperature is also reported. Most of these reactions were conducted under irradiation in a microwave oven in the absence of solvent in an attempt to improve the product yields and to reduce the reaction times.

  16. Synthesis of 5-arylidine amino-1,3,4-thiadiazol-2-[(N-substituted benzyol)]sulphonamides endowed with potent antioxidants and anticancer activity induces growth inhibition in HEK293, BT474 and NCI-H226 cells

    OpenAIRE

    Chhajed, Mahavir; Shrivastava, Anil Kumar; TAILE, Vijay

    2013-01-01

    Abstract A series of imines 5-amino-1,3,4-thiadiazol-2-[(N-substituted benzyol)]sulphonamide derivatives were synthesized from various aromatic aldehydes and substituted with benzoyl acetazolamides under different reaction conditions and were evaluated for their antioxidant and free radical scavenging, antimitotic activity by Allium cepa meristem root model and cytotoxicity activity against HEK 293 (human epidermal kidney cell line), BT474 (breast cancer cell line) and NCI-H226 (lung cancer c...

  17. Synthesis and Antibacterial Activities of 4-Amino-3-( 1-aryl-5-methyl-1,2,3-triazol-4-yl)-5-mercapto-1,2,4- triazoles/2-Amino-5- ( 1- aryl-5- methyl- 1,2,3- triazol-4- yl )- 1,3,4- thiadiazoles and Their Derivatives

    Institute of Scientific and Technical Information of China (English)

    ZHANG,Yan(张艳); SUN,Xiao-Wen(孙小文); HUI,Xin-Ping(惠新平); ZHANG,Zi-Yi(张自义); WANG,Qin(王勤); ZHANG,Qi(张琪)

    2002-01-01

    Treatment of 4-amino-3- (1-aryl-5-methyl-1,2, 3-triazol-4-yl)-5-mercapto-1, 2, 4-triazoles/2-amino-5-( 1-aryi-5-methyl-1, 2,3-triazol-4-yl)-1, 3,4-thiadiazoles with benzaldehyde, acetone and ω-bromoacetophenone was tested and compared. The title compounds Schiff bases, amides, imidazolo[2,1-b]-1,3,4-thiadiazoles and 7H-s-triazolo [3, 4-b ]-1, 3, 4-thiadiazines have been confirmed by elemental analyses, 1H NMR, IR and MS spectra. All the compounds have also been screened for their antibacterial activities against B. subtilis, S. aureus and E. coli.

  18. Ammonium Chloride Promoted Palladium-Catalyzed Ullmann Coupling of Aryl Bromide

    Institute of Scientific and Technical Information of China (English)

    李金恒; 梁云; 刘文杰; 唐石; 谢叶香

    2004-01-01

    In water, ammonium chloride was found to promote palladium-catalyzed Ullmann coupling reactions of aryl bromides. In the presence of Pd/C, zinc, NH4Cl, and water, coupling of various aryl bromides was carried out smoothly to afford the corresponding homocoupling products in moderate yields.

  19. Catalytic membrane-installed microchannel reactors for one-second allylic arylation.

    Science.gov (United States)

    Yamada, Yoichi M A; Watanabe, Toshihiro; Torii, Kaoru; Uozumi, Yasuhiro

    2009-10-07

    A variety of catalytic membranes of palladium-complexes with linear polymer ligands were prepared inside a microchannel reactor via coordinative and ionic molecular convolution to provide catalytic membrane-installed microdevices, which were applied to the instantaneous allylic arylation reaction of allylic esters and aryl boron reagents under microflow conditions to afford the corresponding coupling products within 1 second of residence time.

  20. Unusual selectivity-determining factors in the phosphine-free Heck arylation of allyl ethers

    DEFF Research Database (Denmark)

    Ambrogio, I.; Fabrizi, G.; Cacchi, S.

    2008-01-01

    The Heck reaction of aryl iodides and bromides with allyl ethers has been investigated. Using phosphinefree Pd(OAc)(2) in DNIF at 90 degrees C in the presence of Bu4NOAc, the reaction gave cinnamyl derivatives, usually in good to high yields, with a wide range of aryl halides. The reaction tolera...

  1. Oxidative addition of aryl chlorides to monoligated palladium(0): A DFT-SCRF study

    DEFF Research Database (Denmark)

    Ahlquist, Mårten Sten Gösta; Norrby, Per-Ola

    2007-01-01

    Oxidative addition of aryl chlorides to palladium has been investigated by hybrid density functional theory methods (B3LYP), including a continuum model describing the solvent implicitly. A series of para-substituted aryl chlorides were studied to see the influence of electronic effects on the re...

  2. Synthesis of 3-cyano-4-aryl-5-ethoxycarbonyl-6-methyl-3,4-dihydropyridine-2-thiones

    Energy Technology Data Exchange (ETDEWEB)

    Krauze, A.A.; Liepin' sh, E.E.; Pelcher, Yu.E.; Kalme, Z.A.; Dipan, I.V.; Dubur, G.Ya.

    1985-12-01

    The condensation of ethyl arylidenacetoacetate with cyanothioacetamide and of arylidenecyanothioacetamides with ethyl acetoacetate or of arylidenecyanothioacetamides with ethyl ..beta..-aminocrotonate gave 3-cyano-4-aryl-5-ethoxycarbonyl-6-methyl-3,4-dihydropyridine-2-thiones. PMR spectroscopy showed that the 3-cyano-4-aryl-3,4-dihydro-pyridine-2-thiones are formed as a mixture of cis and trans isomers.

  3. Unprecedentedly mild direct Pd-catalyzed arylation of oxazolo[4,5-b]pyridine

    DEFF Research Database (Denmark)

    Zhuravlev, Fedor

    2006-01-01

    Pd-catalyzed C-2 arylation of oxazolo[4,5-b]pyridine proceeds efficiently at 30 degrees C and tolerates a variety of aryl halides, including derivatized amino acids for which no racemization was observed during the reaction. Experimental evidence for facile deprotonation of oxazolo[4,5-b]pyridine...

  4. In vitro anti-Giardia lamblia activity of 2-aryl-3-hydroxymethyl imidazo[1,2-a]pyridines and -pyrimidines, individually and in combination with albendazole.

    Science.gov (United States)

    Velázquez-Olvera, Stephanía; Salgado-Zamora, Héctor; Jiménez-Cardoso, Enedina; Campos-Aldrete, Maria-Elena; Pérez-González, Cuauhtémoc; Ben Hadda, Taibi

    2016-03-01

    Giardiasis is a major diarrheal disease found throughout the world, the causative agent being the flagellate protozoan Giardia intestinalis. Infection is more common in children than in adults. The appearance of drug resistance has complicated the treatment of several parasitic diseases, including giardiasis. Thus, the aim of this investigation was to make an in vitro evaluation of the antigiardia response of synthetic derivatives 2-aryl-3-hydroxymethylimidazo[1,2-a]pyridines 1 and -pyrimidines 2 against trophozoites of Giardia lamblia WB, in comparison with the reference drug, albendazole. Additionally, the synergistic action of albendazole in combination with each of the most active 2-aryl-3-hydroxymethyl imidazo[1,2-a]pyridines and pyrimidines was also assessed. Based on the IC50 values obtained, the best anti-Giardia activity was provided by the 3-hydroxymethyl-4-fluorophenylimidazo[1,2-a]pyrimidine derivative 2c and the corresponding imidazo[1,2-a]pyrimidine with the p-tolyl substituent 2d, followed by 2a and 2b. These four compounds showed effectiveness at a concentration similar to that of albendazole. Regarding synergism, the IC50 of the combination of albendazole with 2a, 2b or 2c gave the best anti-Giardia action, showing greater efficacy than albendazole alone. Hence, G. lamblia WB showed high susceptibility to some 2-aryl-3-hydroxymethyl imidazo[1,2-a] pyrimidines, which acted synergistically when used in combination with albendazole.

  5. Comparison of Inhibitory Activities of meta and para Substituted N-aryl 3-Hydroxypyridin-4-one Mannosides Towards Type 1 Fimbriated E. coli

    Directory of Open Access Journals (Sweden)

    Vesna Petrović Peroković

    2016-06-01

    Full Text Available In uropathogenic Escherichia coli, mannose-specific adhesion is mediated by the FimH adhesin located at the tip of type 1 fimbriae. Novel mannosylated N-aryl substituted 3-hydroxypyridin-4ones with meta substituents on the aryl part of the molecule were prepared, and their inhibitory properties towards the adhesion of E. coli to guinea pig erythrocytes explored using the hemagglutination assay. These results were compared with inhibitory potencies of analogous para derivatives. The assays revealed greater preference of FimH towards para substituted compounds in general, with p-nitro and p-methoxy substituted substrates being much more effective then the hydrophobic p-methyl compound. When substituents are in meta position the positive affect on the binding of compounds in the FimH binding site was observed with all compounds tested but the structure with an alkyl group was shown to be the most effective one. This study provides guidelines for the rational design of novel, more effective series of FimH antagonists. This work is licensed under a Creative Commons Attribution 4.0 International License.

  6. Multiconfiguration Self-Consistent Field Study on Formonitrile Imine and N-Substituted Nitrile Imines HCN2-R: Energy Component Analysis of the Pseudo-Jahn-Teller Effect.

    Science.gov (United States)

    Toyota, Azumao; Muramatsu, Takashi; Koseki, Shiro

    2017-03-23

    Stable geometrical structures for formonitrile imine (1) and N-substituted nitrile imines HCN2-R (R = Li, BeH, BH2, CH3, CN, CCH, C6H5, NH2, OH, and F) (2-11) were examined by using the multiconfiguration self-consistent-field (MCSCF) method followed by second-order configuration interaction (SOCI) calculations and second-order multiconfiguration quasi-degenerate perturbation theory (MCQDPT2) calculations, together with the aug-cc-pVTZ basis sets. The results show that 1 suffers a pseudo-Jahn-Teller (JT) distortion from a linear C∞v structure to a C1 structure via a planar bent Cs structure. Each of the others is found to undergo pseudo-JT distortion from a symmetrical structure to a planar bent Cs structure for 2, 3, and 7 and to a C1 structure for 4, 5, 6, 8, 9, 10, and 11. At the stationary structures of 1-11, the structural characteristics were briefly discussed in terms of allenic and propargylic. To elucidate the nature of pseudo-JT distortions, energy component analyses were carried out at the MCSCF+SOCI level of theory at all of the stationary structures for the relevant molecules. In most of the molecules examined, pseudo-JT stabilizations were classified into two groups, one in which the stability arises from a lowering of the energy of the attractive term Ven and the other in which the stability results from a lowering of the energy of the repulsive terms Vnn and Vee. In addition to the above two groups, it was also found that the following three groups are responsible for the pseudo-JT stabilizations in a certain stage of the structural changes. Namely, one is a lowering of the energy of the term Vee observed in 6, another is a lowering of the energy of the terms Vee and Ven observed in 9-11, and the other is a lowering of the energy of the terms Ven and Vnn observed in 10. These energetic behaviors were accounted in terms of an elongation or a contraction of the molecular skeleton, a migration of electrons from one part of the molecule to other parts

  7. Synthesis and solid state structures of Chalcogenide compounds of Imidazolin-2-ylidene-1,1-Diphenyl-phosphinamine

    Indian Academy of Sciences (India)

    Naktode Kishor; Suman Das; Abhinanda Kundu; Hari Pada Nayek; Tarun K Panda

    2016-03-01

    We report the synthesis and solid state structures of 1,3-di-aryl-imidazolin-2-ylidine-1,1-diphenylphosphinamine [(aryl=mesityl (1a) and aryl=2,6-diisopripyl (1b)] and their chalcogenide compounds 3-di-aryl-imidazolin-2-ylidine-P, P-diphenylphosphinicamide (2a,b), 1,3-di-aryl-imidazolin-2-ylidine-P,P diphenyl-phosphinothioicamide (3a,b) and 1,3-diaryl-imidazolin-2-ylidine-P,P -diphenyl-phosphinoselenoicamide (4a,b).The compounds 1a,b were prepared in good yield by the reaction of 1,3-di-aryl-imidazolin-2-imine and chlorodiphenylphosphine in the presence of triethylamine in toluene. The reactions of 1a,b with elemental sulphur and selenium afforded the corresponding chalcogenide compounds 3a,b and 4a,b respectively.The corresponding oxo- derivative (2a,b) was obtained by reacting compound 1a,b with 30% aqueous hydrogen peroxide in THF. The molecular structures of 1a, 2a, 3a and 4a,b have been established by single crystal X-ray diffraction analyses. The molecular structures reveal that even C1–N1–P1 angle (124.62o) in compound 1a is less obtuse compared to the corresponding C1–N1–Si1 angles (157.8o) observed in related N-silylated 2-iminoimidazolines and trimethylsilyl iminophosphoranes. C1–N1–P1 angles are further widened in compounds 2a, 3a, and 4a,b due to the attachment of chalcogen atoms onto phosphorus atom.

  8. Catalytic arylation methods from the academic lab to industrial processes

    CERN Document Server

    Burke, Anthony J

    2014-01-01

    A current view of the challenging field of catalytic arylation reactions. Clearly structured, the chapters in this one-stop resource are arranged according to the reaction type, and focus on novel, efficient and sustainable processes, rather than the well-known and established cross-coupling methods.The entire contents are written by two authors with academic and industrial expertise to ensure consistent coverage of the latest developments in the field, as well as industrial applications, such as C-H activation, iron and gold-catalyzed coupling reactions, cycloadditions or novel methodologies

  9. Role of the Aryl Hydrocarbon Receptor in Colon Neoplasia

    Directory of Open Access Journals (Sweden)

    Guofeng Xie

    2015-07-01

    Full Text Available For both men and women, colorectal cancer (CRC is the second leading cause of cancer death in the United States, primarily as a consequence of limited therapies for metastatic disease. The aryl hydrocarbon receptor (AhR is a ligand-dependent transcription factor with diverse functions in detoxification of xenobiotics, inflammatory responses, and tissue homeostasis. Emerging evidence indicates that AhR also plays an important role in regulating intestinal cell proliferation and tumorigenesis. Here, we review both the pro- and anti-carcinogenic properties of AhR signaling and its potential role as a therapeutic target in CRC.

  10. Role of the Aryl Hydrocarbon Receptor in Colon Neoplasia

    Energy Technology Data Exchange (ETDEWEB)

    Xie, Guofeng, E-mail: gxie@medicine.umaryland.edu; Raufman, Jean-Pierre [Division of Gastroenterology and Hepatology, Veterans Administration Maryland Health Care System, University of Maryland School of Medicine, Baltimore, MD 21201 (United States)

    2015-07-31

    For both men and women, colorectal cancer (CRC) is the second leading cause of cancer death in the United States, primarily as a consequence of limited therapies for metastatic disease. The aryl hydrocarbon receptor (AhR) is a ligand-dependent transcription factor with diverse functions in detoxification of xenobiotics, inflammatory responses, and tissue homeostasis. Emerging evidence indicates that AhR also plays an important role in regulating intestinal cell proliferation and tumorigenesis. Here, we review both the pro- and anti-carcinogenic properties of AhR signaling and its potential role as a therapeutic target in CRC.

  11. Mechanistic Study of the Acid Degradation of Lignin Model Compounds

    Energy Technology Data Exchange (ETDEWEB)

    Sturgeon, M.; Kim, S.; Chmely, S. C.; Foust, T. D.; Beckham, G. T.

    2012-01-01

    Lignin is a major constituent of biomass, which remains underutilized in selective biomass conversion strategies to renewable fuels and chemicals. Here we are interested in understanding the mechanisms related to the acid deconstruction of lignin with a combined theoretical and experimental approach. Two model dimers with a b-O-4 aryl ether linkage (2-phenoxy-1-phenethanol and 2-phenoxy-1-phenyl-1,3 propanediol) and model dimmers with an a-O-4 aryl ether linkage were synthesized and deconstructed in H2SO4. The major products of the acidolysis of the b-O-4 compounds consisted of phenol and two aldehydes, phenylacetaldehyde and benzaldehyde. Quantum mechanical calculations were employed to elucidate possible deconstruction mechanisms with transition state theory. To confirm proposed mechanisms several possible intermediates were studied under similar acidolysis conditions. Although the resonance time for cleavage was on the order several hours, we have shown that the cleavage of the aryl ether linkage affords phenol and aldehydes. We would next like to utilize our mechanism of aryl ether cleavage in actual lignin.

  12. Room temperature N-arylation of amino acids and peptides using copper(I) and β-diketone.

    Science.gov (United States)

    Sharma, Krishna K; Sharma, Swagat; Kudwal, Anurag; Jain, Rahul

    2015-04-28

    A mild and efficient method for the N-arylation of zwitterionic amino acids, amino acid esters and peptides is described. The procedure provides the first room temperature synthesis of N-arylated amino acids and peptides using CuI as a catalyst, diketone as a ligand, and aryl iodides as coupling partners. The method is equally applicable for using relatively inexpensive aryl bromides as coupling partners at 80 °C. Using this procedure, electronically and sterically diverse aryl halides, containing reactive functional groups were efficiently coupled in good to excellent yields.

  13. Synthesis of indazoles by the [3+2] cycloaddition of diazo compounds with arynes and subsequent acyl migration.

    Science.gov (United States)

    Liu, Zhijian; Shi, Feng; Martinez, Pablo D G; Raminelli, Cristiano; Larock, Richard C

    2008-01-04

    The [3+2] cycloaddition of a variety of diazo compounds with o-(trimethylsilyl)aryl triflates in the presence of CsF or TBAF at room temperature provides a very direct, efficient approach to a wide range of potentially biologically and pharmaceutically interesting substituted indazoles in good to excellent yields under mild reaction conditions. Simple diazomethane derivatives afford N-unsubstituted indazoles or 1-arylated indazoles, depending upon the stoichiometry of the reagents and the reaction conditions, while dicarbonyl-containing diazo compounds undergo carbonyl migration to afford 1-acyl or 1-alkoxycarbonyl indazoles selectively.

  14. Functionalization of heterocyclic compounds using polyfunctional magnesium and zinc reagents

    Directory of Open Access Journals (Sweden)

    Paul Knochel

    2011-09-01

    Full Text Available In this review we summarize the most important procedures for the preparation of functionalized organzinc and organomagnesium reagents. In addition, new methods for the preparation of polyfunctional aryl- and heteroaryl zinc- and magnesium compounds, as well as new Pd-catalyzed cross-coupling reactions, are reported herein. Experimental details are given for the most important reactions in the Supporting Information of this article.

  15. Formation of spirocyclic compounds from Heck cyclizations invoking cyclic enamides.

    Science.gov (United States)

    Satyanarayana, Gedu; Maier, Martin E

    2008-07-18

    The palladium-mediated transformation of 3,4-dihydro-2(1H)-pyridinones 12 featuring a (2-bromophenyl)ethyl substituent in the 5-position produces spirocyclic products, imides 14 and amides 15. The formation of these products can be explained by insertion of the enamide double bond into the initial aryl-Pd bond followed by oxidation or reduction of the organopalladium intermediate. Alternatively, formation of these spiro compounds might proceed via acyliminium ion intermediates.

  16. A rapid microwave assisted synthesis of 1-(6-chloro-2-methyl-4-phenylquinolin-3-yl)-3-(aryl)prop-2-en-1-ones and their anti bacterial and anti fungal evaluation

    OpenAIRE

    Sarveswari, S.; Vijayakumar, V.

    2016-01-01

    The 1-(6-chloro-2-methyl-4-phenylquinolin-3-yl)-3-(aryl)prop-2-en-1-ones were synthesized by microwave assisted synthesis, the antimicrobial activities of synthesized compounds were screened against Gram negative organisms such as Escherichia coli (ATCC 25922), Bacillus subtilis (ATCC 117788), Salmonella typhi (ATCC 25264), Gram positive Staphylococcus aureus (ATCC 700699) and fungal organisms such as Aspergillus flavus, Aspergillus fumigatus and Candida utilius.

  17. Aryl Diazonium Chemistry for the Surface Functionalization of Glassy Biosensors.

    Science.gov (United States)

    Zheng, Wei; van den Hurk, Remko; Cao, Yong; Du, Rongbing; Sun, Xuejun; Wang, Yiyu; McDermott, Mark T; Evoy, Stephane

    2016-03-14

    Nanostring resonator and fiber-optics-based biosensors are of interest as they offer high sensitivity, real-time measurements and the ability to integrate with electronics. However, these devices are somewhat impaired by issues related to surface modification. Both nanostring resonators and photonic sensors employ glassy materials, which are incompatible with electrochemistry. A surface chemistry approach providing strong and stable adhesion to glassy surfaces is thus required. In this work, a diazonium salt induced aryl film grafting process is employed to modify a novel SiCN glassy material. Sandwich rabbit IgG binding assays are performed on the diazonium treated SiCN surfaces. Fluorescently labelled anti-rabbit IgG and anti-rabbit IgG conjugated gold nanoparticles were used as markers to demonstrate the absorption of anti-rabbit IgG and therefore verify the successful grafting of the aryl film. The results of the experiments support the effectiveness of diazonium chemistry for the surface functionalization of SiCN surfaces. This method is applicable to other types of glassy materials and potentially can be expanded to various nanomechanical and optical biosensors.

  18. Aryl Diazonium Chemistry for the Surface Functionalization of Glassy Biosensors

    Science.gov (United States)

    Zheng, Wei; van den Hurk, Remko; Cao, Yong; Du, Rongbing; Sun, Xuejun; Wang, Yiyu; McDermott, Mark T.; Evoy, Stephane

    2016-01-01

    Nanostring resonator and fiber-optics-based biosensors are of interest as they offer high sensitivity, real-time measurements and the ability to integrate with electronics. However, these devices are somewhat impaired by issues related to surface modification. Both nanostring resonators and photonic sensors employ glassy materials, which are incompatible with electrochemistry. A surface chemistry approach providing strong and stable adhesion to glassy surfaces is thus required. In this work, a diazonium salt induced aryl film grafting process is employed to modify a novel SiCN glassy material. Sandwich rabbit IgG binding assays are performed on the diazonium treated SiCN surfaces. Fluorescently labelled anti-rabbit IgG and anti-rabbit IgG conjugated gold nanoparticles were used as markers to demonstrate the absorption of anti-rabbit IgG and therefore verify the successful grafting of the aryl film. The results of the experiments support the effectiveness of diazonium chemistry for the surface functionalization of SiCN surfaces. This method is applicable to other types of glassy materials and potentially can be expanded to various nanomechanical and optical biosensors. PMID:26985910

  19. Synthesis of 2-Azulenyltetrathiafulvalenes by Palladium-Catalyzed Direct Arylation of 2-Chloroazulenes with Tetrathiafulvalene and Their Optical and Electrochemical Properties.

    Science.gov (United States)

    Shoji, Taku; Araki, Takanori; Sugiyama, Shuhei; Ohta, Akira; Sekiguchi, Ryuta; Ito, Shunji; Okujima, Tetsuo; Toyota, Kozo

    2017-02-03

    Tetrathiafulvalene (TTF) derivatives with 2-azulenyl substituents 5-11 were prepared by the palladium-catalyzed direct arylation reaction of 2-chloroazulenes with TTF in good yield. Photophysical properties of these compounds were investigated by UV-vis spectroscopy and theoretical calculations. Redox behavior of the novel azulene-substituted TTFs was examined by using cyclic voltammetry and differential pulse voltammetry, which revealed their multistep electrochemical oxidation and/or reduction properties. Moreover, these TTF derivatives showed significant spectral change in the visible region under the redox conditions.

  20. Efficient One-pot Synthesis of 12-Aryl-8, 9, 10, 12-tetrahydrobenzo[a]xanthen-11-ones Under Solvent-free Conditions

    Institute of Scientific and Technical Information of China (English)

    JIA Xu-dong; HAN Song-yang; DUAN Hai-feng; LIN Ying-jie; CAO Jun-gang; LIANG Da-peng; WU Mao-cheng

    2013-01-01

    Multi-component condensation of 2-naphthol,aromatic aldehydes,and cyclic 1,3-dicarbonyl compounds catalyzed by ionic liquid [NSPTEA][HSO4] was accomplished for the synthesis of a series of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-1 l-ones under solvent-flee conditions.High yields,ease recovery,short reaction time and reusability of catalyst are significant advantages.ZrOCl2·8H2O was also found to act as an effective catalyst towards this transformation.

  1. Some higher N-substituted 1,3-thiazolidine-2,4-diones and 5,5-diphenylhydantoins, their synthesis and corrosion preventive properties in mineral oil medium

    Science.gov (United States)

    Öztürk, Serkan; Yıldırım, Ayhan; Çetin, Mehmet

    2013-01-01

    Some five membered heterocyclic compounds were synthesized by the reaction of 2,4-thiazolidinedione or 5,5-diphenylhydantoin potassium salts with 2-chloro-N-alkylacetamides and alkyl-2-chloroacetates. The structure confirmations of the synthesized compounds were performed by FT-IR, 1H NMR, 13C NMR spectra. The inhibitory effectiveness of the compounds were evaluated against the corrosion of steel strip immersed in water containing paraffin based mineral oil medium in accordance to standard test method. Surface characterization studies of the metal coupons used were performed by SEM analysis and also by the contact angle measurements using the Sessile-Drop method. In addition the 3D image of the metal surface was obtained using optical profilometer. The test results and surface characterization studies showed that all synthesized compounds are excellent corrosion inhibitors in such a water in oil emulsion system.

  2. Synthesis and structure-active relationship of 1-aryl-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline anticonvulsants.

    Science.gov (United States)

    Gitto, Rosaria; De Luca, Laura; Ferro, Stefania; Agnello, Stefano; Russo, Emilio; De Sarro, Giovanbattista; Chimirri, Alba

    2010-12-01

    We have previously disclosed that some 6,7-dimethoxyisoquinoline derivatives are able to produce anticonvulsant effects in different animal models of epilepsy. Following these studies this paper describes the synthesis of a small series of new 1-aryl-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolines strictly related to previously reported analogues. This novel series of isoquinolines was designed on the basis of well defined structure-active relationship (SAR) information already acquired for this class of anticonvulsant agents. The pharmacological effects of the new synthesized compounds were evaluated against audiogenic seizures in Dilute Brown non-Agouti (DBA/2) mice. The preliminary pharmacological screening led to the identification of a new active molecule the 2-acetyl-1-(4'-methylphenyl)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline (6d) that displayed significant anticonvulsant activity. Computational studies helped to rationalize these obtained pharmacological results.

  3. 2D-QSPR/DFT studies of aryl-substituted PNP-Cr-based catalyst systems for highly selective ethylene oligomerization.

    Science.gov (United States)

    Tang, Siyang; Liu, Zhen; Zhan, Xingwen; Cheng, Ruihua; He, Xuelian; Liu, Boping

    2014-03-01

    1-Hexene and 1-octene are important comonomers for the synthesis of high performance polyolefins. Recently, various N-substituted Cr-bis(diphenylphosphino)amine (PNP-Cr) catalysts show the potential as excellent candidates for highly selective ethylene trimerization/tetramerization. In this work, a series of aryl-substituted PNP-Cr catalysts were studied by two-dimensional quantitative structure-property relationship (QSPR) method based on density functional theory (DFT) calculations. The heuristic method (HM) and best multi-linear regression (BMLR) were used to establish the best linear regression models to describe the relationship between selectivities and catalyst structures. Both Cr(I) and Cr(II) active site models for ethylene trimerization/tetramerization were considered. It was found that 1) the relativity and stability of the models were increased by using self-defined descriptors based on DFT calculations; 2) Cr(I)/Cr(III) centers were the most plausible active sites for ethylene trimerization, while Cr(II)/Cr(IV) active sites were most possibly responsible for ethylene tetramerization; and 3) the skeleton structures of the PNP-Cr system with good complanation and symmetry were crucial for achieving excellent catalytic selectivity of 1-octene, while the PNP-Cr backbone with a large steric effect on N atom would benefit ethylene trimerization. Six new PNP ligands with high selectivity toward ethylene trimerization/tetramerization were predicted based on descriptor analysis and the best linear regression models providing a good basis for further development of novel catalyst systems with better performance.

  4. Facile synthesis of novel substituted aryl-thiazole (SAT) analogs via one-pot multi-component reaction as potent cytotoxic agents against cancer cell lines.

    Science.gov (United States)

    Mirza, Salma; Asma Naqvi, Syeda; Mohammed Khan, Khalid; Salar, Uzma; Choudhary, M Iqbal

    2017-02-01

    In this study, twenty-five (25) substituted aryl thiazoles (SAT) 1-25 were synthesized, and their in vitro cytotoxicity was evaluated against four cancer cell lines, MCF-7 (ER(+ve) breast), MDA-MB-231 (ER(-ve) breast), HCT116 (colorectal) and HeLa (cervical). The activity was compared with the standard anticancer drug doxorubicin (IC50=1.56±0.05μM). Among them, compounds 1, 4-8, and 19 were found to be toxic to all four cancer cell lines (IC50 values 5.37±0.56-46.72±1.80μM). Compound 20 was selectively active against MCF7 breast cancer cells with IC50 of 40.21±4.15μM, whereas compound 19 was active against MCF7 and HeLa cells with IC50 of 46.72±1.8, and 19.86±0.11μM, respectively. These results suggest that substituted aryl thiazoles 1 and 4 deserve to be further investigated in vivo as anticancer leads.

  5. 3,4-trans-4-Aryl-3-(1-pyridinio)-1,2,3,4-tetrahydropyridine-6-thiolates--new group of potential cardiotonic drugs.

    Science.gov (United States)

    Krauze, A; Vītoliņa, R; Garaliene, V; Sīle, L; Klusa, V; Duburs, G

    2005-11-01

    3,4-trans-4-Aryl-3-(1-pyridinio)-1,2,3,4-tetrahydropyridine-6-thiolates 6-11 were prepared by a Michael reaction of N-acetonylpyridinium chloride with 3-aryl-2-cyanothioacrylamides or by a one-pot three-carbon condensation of N-acetonylpyridinium chloride, aromatic aldehyde and 2-cyanothioacetamide, and their cardiotonic properties were studied. 3,4-trans-5-cyano-2-hydroxy-2-methyl-4-(3-nitrophenyl)-3-(1-pyridinio)-1,2,3,4-tetrahydropyridine-6-thiolate 8 was considered as a lead compound in this series since it in vitro experiments (spontaneously beating rat atria) showed a cardiotonic activity similar to that of milrinone 2, however compound 8 induced activity at lover concentrations and without influence on chronotropic action of the heart. Unlike milrinone 2, thiolate 8 in vivo experiments (anaesthetized rats) did not influence blood pressure and heart rate. The acute toxicity of compound 8 was more than 10 times lower than that of milrinone 2.

  6. Synthesis, characterization and evaluation of antibacterial activity of (E)-N'-(substituted benzylidene)-2-(2-fluorobenzyl)-5-ethyl-2H-1,2,3-triazole-4-carbohydrazides.

    Science.gov (United States)

    Reddy, P V B; Kamala Prasad, V; Manjunath, G; Venkata Ramana, P

    2016-09-01

    Triazoles and their derivatives are important precursors in the pharmacological field due to their broad diversity of medicinal and biological deed. In this article, the exploration is to put an effort to produce some novel biologically active triazole 4-carbohydrazide derivatives. The structures of the newly synthesized compounds were characterized and confirmed by spectral data and were screened for anti-bacterial activity. Compounds 5(d-i), 5l and 5m were observed to possess potent anti-microbial activity.

  7. Interaction of fish aryl hydrocarbon receptor paralogs (AHR1 and AHR2) with the retinoblastoma protein

    Energy Technology Data Exchange (ETDEWEB)

    Merson, Rebeka R., E-mail: rmerson@ric.edu [Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543 (United States); Biology Department, Rhode Island College, 500 Mt. Pleasant Ave., Providence, RI 02908 (United States); Karchner, Sibel I.; Hahn, Mark E. [Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543 (United States)

    2009-08-13

    The aryl hydrocarbon receptor (AHR) mediates the toxic effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and related compounds. In some mammalian cell lines, TCDD induces G1 cell cycle arrest, which depends on an interaction between the AHR and the retinoblastoma tumor suppressor (RB). Mammals possess one AHR, whereas fishes possess two or more AHR paralogs that differ in the domains important for AHR-RB interactions in mammals. To test the hypothesis that fish AHR paralogs differ in their ability to interact with RB, we cloned RB cDNA from Atlantic killifish, Fundulus heteroclitus, and studied the interactions of killifish RB protein with killifish AHR1 and AHR2. In coimmunoprecipitation experiments, in vitro-expressed killifish RB coprecipitated with both AHR1 and AHR2. Consistent with these results, both killifish AHR1 and AHR2 interacted with RB in mammalian two-hybrid assays. These results suggest that both fish AHR1 and AHR2 paralogs may have the potential to influence cell proliferation through interactions with RB.

  8. Synthesis of -aryl--lactones and relationship: Structure – antifeedant and antifungal activity

    Indian Academy of Sciences (India)

    Andrzej Skrobiszewski; Witold Gładkowski; Paulina Walczak; Anna Gliszczyńska; Gabriela Maciejewska; Tomasz Klejdysz; Jan Nawrot; Czesław Wawrzeńczyk

    2015-04-01

    Eighteen racemic -aryl--lactones derived from simple aromatic aldehydes have been obtained in the chemical synthesis. Iodolactones (5c and 6c) were synthesized from ()-4-(benzo[][1′,3′]-dioxol-5′-yl)- but-3-en-2-one (1). Reductive dehalogenation of iodolactones 5a–c and 6a–c afforded -ethyl--lactones (7a–c, 8a–c) whereas the unsaturated lactones (9a–c, 10a–c) were obtained by dehydrohalogenation of iodolactones. All synthesized lactones were fully characterized by spectroscopic data (NMR, IR, HRMS) and subjected to the tests on the antifeedant activity towards Tribolium confusum, Trogoderma granarium and Sitophilus granaries as well to the tests on the antifungal activity towards four Fusarium species. The biological tests allowed to find some relationships between the structure and biological activity of the compounds studied. -Ethyl--lactones 7a–c, 8a–c and unsaturated lactones 9a–c, 10a-c were usually stronger antifeedants than their parent iodolactones 5a–c and 6a–c. trans-Iodolactones 6a–c were more active than cis isomers 5a-c both in antifeedant and antifungal assays. The structure of aromatic substituent was the key factor in antifungal activity. The lactones with benzo [][1,3]dioxole ring (5c, 6c, 7c, 8c, 9c) were the most active whereas those with unsubstituted benzene ring exhibited almost no activity.

  9. Experimental and theoretical study on the structure-property relationship of novel 1-aryl-3-methylsuccinimides

    Science.gov (United States)

    Banjac, Nebojša R.; Božić, Bojan Đ.; Mirković, Jelena M.; Vitnik, Vesna D.; Vitnik, Željko J.; Valentić, Nataša V.; Ušćumlić, Gordana S.

    2017-02-01

    A series of ten 1-aryl-3-methylsuccinimides was synthesized and their solvatochromic properties were studied in a set of fifteen binary solvent mixtures. The solute-solvent interactions were analyzed on the basis of the linear solvation energy relationship (LSER) concept proposed by Kamlet and Taft. The electronic effect of the substituents on the UV-Vis absorption and NMR spectra was analyzed using the simple Hammett equation. Moreover, the B3LYP, CAM-B3LYP, and M06-2X functionals using the 6-311G(d,p) basic set have been assessed in light of the position of experimental absorption maxima obtained for these compounds. The integration grid effects have also been evaluated. An interpretation of the substituent-effect transmission through the molecular skeleton and the nature of the HOMO and LUMO orbitals based on quantum-chemical calculations is given. The values of partial atomic charges from the atomic polar tenzors (APT), natural population analysis (NBO), and charges fit to the electrostatic potential using the B3LYP, CAM-B3LYP, and M06-2X methods are produced and correlated with different experimental properties. In order to estimate the chemical activity of the molecule, the molecular electrostatic potential (MEP) surface map is calculated for the optimized geometry of 1-phenyl-3-methylsuccinimide.

  10. Reduction of vitellogenin synthesis by an aryl hydrocarbon receptor agonist in the white sturgeon (Acipenser transmontamus).

    Science.gov (United States)

    Palumbo, Amanda J; Denison, Michael S; Doroshov, Serge I; Tjeerdema, Ronald S

    2009-08-01

    Migrating white sturgeon (Acipenser transmontamus) may be subject to agricultural, municipal, and industrial wastewater effluents that likely contain different classes of endocrine-disrupting contaminants. Concern is mounting about the negative effects of environmental estrogens on fish reproduction; however, in environmental mixtures, the affects from estrogenic compounds may be suppressed by aryl hydrocarbon receptor (AhR) ligands. Indeed, reductions in 17beta-estradiol-induced (0.01 and 1 mg/kg) vitellogenin (VTG) levels were observed in white sturgeon coinjected with beta-naphthoflavone (BNF; 50 mg/kg), a model for contaminants that activate the AhR. Variation in the time of injection was used to attempt to correlate VTG inhibition to ethoxyresorufin-O-deethylase activity. No evidence was found to suggest that the inhibition of VTG is a direct result of enhanced estrogen metabolism by BNF-induced enzymes. Results of the present study are relevant for monitoring programs that measure VTG, because these results show that AhR-active environmental contaminants can repress VTG synthesis, which commonly is used as an indicator of estrogen-mimicking contaminants. Furthermore, suppression of natural estrogen signaling by AhR agonists may have significant effects on fish reproduction.

  11. Polymorphism of the aryl-hydrocarbon receptor gene in intron 10 of human cancers

    Directory of Open Access Journals (Sweden)

    M. Rocas

    2011-11-01

    Full Text Available Polychlorinated dibenzo-p-dioxins (PCDDs and related halogenated aromatic hydrocarbons (e.g., PCDFs, often called "dioxins", are ubiquitously present environmental contaminants. Some of them, notably 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD, are among the most toxic synthetic compounds known. The biological effects of dioxins are mediated via the aryl hydrocarbon receptor (AhR. Mutations in the AhR transactivation domain are linked to sensitivity to the acute lethality of TCDD. We present here a study of AhR gene polymorphism in normal and cancer human tissues affecting pre-mRNA splicing in the AhR gene-coding transactivation domain region (exon 10, intron 10, exon 11 region, previously shown to be associated with AhR dysfunction. We tested 126 pairs of normal and cancer tissue samples from liver, lung, stomach, kidney, mucous, breast, and pancreas of 49 males and 77 females (45-70 years of age. We used in vitro splicing assay, RT-PCR and sequencing methods. Our results showed that in an in vitro system it is possible to reconstitute cellular pre-mRNA splicing events. Tested cancer tissues did not contain mutations in the AhR transactivation domain region when the DNA sequences were compared with those from normal tissues. There were also no differences in AhR mRNA splice variants between normal and malignant breast tissues and no polymorphisms in the studied regions or cDNA.

  12. Synthesis, biological activity evaluation and molecular docking studies of novel coumarin substituted thiazolyl-3-aryl-pyrazole-4-carbaldehydes.

    Science.gov (United States)

    Vaarla, Krishnaiah; Kesharwani, Rajesh Kumar; Santosh, Karnewar; Vedula, Rajeswar Rao; Kotamraju, Srigiridhar; Toopurani, Murali Krishna

    2015-12-15

    A novel series of coumarin substituted thiazolyl-3-aryl-pyrazole-4-carbaldehydes (4a-o) were synthesized via an efficient, one-pot multicomponent approach involving 3-(2-bromoacetyl)coumarins (1a-g), thiosemicarbazide (2) and substituted acetophenones (3a-c) utilizing Vilsmeier-Haack reaction condition with good yields. The title compounds structure was elucidated by spectroscopic data (IR, NMR and Mass) and elemental analysis. All the synthesized compounds were screened for their in vitro cytotoxic activity against MCF-7, DU-145 and HeLa cell lines and studied detailed about molecular interaction of probable target protein human microsomal cytochrome CYP450 2A6 using docking simulation. These coumarin derivatives were exhibiting moderate to appreciable cytotoxic activities. The compounds 4m and 4n exhibited significant cytotoxic activity with IC50 values having 5.75 and 6.25μM against HeLa cell line. Similarly compound 4n also exhibiting good anti cancer property and antibacterial activity against DU-145 cell line and Gram negative bacterial strains.

  13. An advantageous route to oxcarbazepine (trileptal) based on palladium-catalyzed arylations free of transmetallating agents.

    Science.gov (United States)

    Carril, Mónica; SanMartin, Raul; Churruca, Fátima; Tellitu, Imanol; Domínguez, Esther

    2005-10-27

    [reaction: see text] A new route to oxcarbazepine (Trileptal), the most widely prescribed antiepileptic drug, starting from commercially available 2'-aminoacetophenone and 1,2-dibromobenzene, is reported. The sequentially accomplished key steps are palladium-catalyzed intermolecular alpha-arylation of ketone enolates and intramolecular N-arylation reactions. After several experiments to establish the best conditions for both arylation processes, the target oxcarbazepine is obtained in a satisfactory overall yield, minimizing the number of steps and employing scalable catalytic procedures developed in partially aqueous media.

  14. Well-Defined Copper(I) Fluoroalkoxide Complexes for Trifluoroethoxylation of Aryl and Heteroaryl Bromides

    KAUST Repository

    Huang, Ronglu

    2015-03-17

    © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Copper(I) fluoroalkoxide complexes bearing dinitrogen ligands were synthesized and the structure and reactivity of the complexes toward trifluoroethoxylation, pentafluoropropoxylation, and tetrafluoropropoxylation of aryl and heteroaryl bromides were investigated. Efficiency drive: A series of copper(I) fluoroalkoxide complexes bearing N,N ligands have been prepared and structurally characterized. These well-defined complexes serve as efficient reagents for the fluoroalkoxylation of aryl and heteroaryl bromides to produce a wide range of trifluoroethyl, pentafluoropropyl, and tetrafluoropropyl (hetero)aryl ethers in good to excellent yields.

  15. Ceric Ammonium Nitrate-Mediated Oxidative Cycloaddition of 1,3-Dicarbonyls to β-Aryl-α, β-unsaturated Ketones

    Institute of Scientific and Technical Information of China (English)

    ZHANG Wei; HUO Cong-De; LIU Zheng-Gang; LIU Zhong-Li

    2003-01-01

    @@ Oxidative addition of carbon-centred radicals to alkenes mediated by metal salts ( MnⅢ, CeⅣ, HgⅡ,PdⅣ, AgⅠ,and CuⅡ) has received considerable attention over last decade in organic synthesis for construction of carbon-carbon bond. [1,2] Among them, manganese(Ⅲ) acetate and ceric(Ⅳ) ammonium nitrate (CAN) have been use most efficiently. Recently, CAN-mediated oxidative cycloaddition of 1,3-dicarbonyl compounds to alkenes, conjugated compounds, enol silyl ethers and alkynes, has been studied extensively. We exploited that the CAN-mediated oxidative cycloaddition of 1,3-dicarbonyl compounds to β-aryl-α,β-unsaturated ketones afforded dihydrofuran derivatives in moderate yields. All the products were characterized by 1H NMR, 13C NMR, MS and HRMS spectra.

  16. Novel aryl and heteroaryl substituted N-[3-(4-phenylpiperazin-1-yl)propyl]-1,2,4-oxadiazole-5-carboxamides as selective GSK-3 inhibitors.

    Science.gov (United States)

    Koryakova, Angela G; Ivanenkov, Yan A; Ryzhova, Elena A; Bulanova, Elena A; Karapetian, Ruben N; Mikitas, Olga V; Katrukha, Eugeny A; Kazey, Vasily I; Okun, Ilya; Kravchenko, Dmitry V; Lavrovsky, Yan V; Korzinov, Oleg M; Ivachtchenko, Alexandre V

    2008-06-15

    Synthesis, biological evaluation, and SAR dependencies for a series of novel aryl and heteroaryl substituted N-[3-(4-phenylpiperazin-1-yl)propyl]-1,2,4-oxadiazole-5-carboxamide inhibitors of GSK-3beta kinase are described. The inhibitory activity of the synthesized compounds is highly dependent on the character of substituents in the phenyl ring and the nature of terminal heterocyclic fragment of the core molecular scaffold. The most potent compounds from this series contain 3,4-di-methyl or 2-methoxy substituents within the phenyl ring and 3-pyridine fragment connected to the 1,2,4-oxadiazole heterocycle. These compounds selectively inhibit GSK-3beta kinase with IC(50) value of 0.35 and 0.41 microM, respectively.

  17. Synthesis and Antibacterial Activities of N-[(1-Aryl-3-phenyl-pyrazol-4-yl)methylene]-2-(halo-o-hydroxyphenyl)hydrazide Derivatives

    Institute of Scientific and Technical Information of China (English)

    LIU Ya; LU Bo-wei; LU Jun-rui; XIN Chun-wei; LI Jian-fa; MU Jiang-bei; BAO Xiu-rong

    2013-01-01

    A series of novel N-[(1-aryl-3-phenyl-pyrazol-4-yl)methylene]-2-(halo-o-hydroxyphenyl)hydrazide derivatives was synthesized and the antibacterial activity of each of them was evaluated.The supposed reaction mechanism of acquiring compounds 3a—3d is that catalytic activity is enhanced by the electron-donating groups of the first phenyl ring while decreased by electron-withdrawing groups of that ring.The result of preliminary bioassay shows that the lowest minimal inhibitory concentration(MIC) of the title compounds against Escherichia coli is 2 μg/mL.MIC values against Monilia albican and Staphlococcus aureus are as low as 4 μg/mL.They will be a series of potential antibacterial compounds against fungi and gram-negative bacteria.

  18. Novel fluorescent 1,8-naphthalimide derivatives containing thiophene and pyrazole moieties: Synthesis by direct C-H arylation and evaluation of photophysical and electrochemical properties

    Science.gov (United States)

    Jin, Zhengneng; Wu, Jiashou; Wang, Chuanfeng; Dai, Guoliang; Liu, Shiyong; Lu, Jianmei; Jiang, Huajiang

    2014-01-01

    A series of novel 1,8-naphthalimide derivatives containing thiophene and pyrazole moities were synthesized by direct Pd-catalyzed C-H arylation and then characterized by 1H NMR, 13C NMR, MALDI-HRMS, and elementary analysis. The photophysical and electrochemical properties of the derivatives were also investigated. All compounds have green emission both in diluted CH2Cl2 solution and solid film. The cyclic voltammetry (CV) measurements showed that the target compounds had a lowest unoccupied molecular orbital (LUMO) range from -3.49 eV to -3.29 eV and a highest occupied molecular orbital (HOMO) range from -6.04 eV to -5.81 eV. Quantum chemical calculations were performed to obtain the optimized ground-state geometry as well as the spatial distributions of the HOMO, LUMO levels of the compounds.

  19. Rh(III)-Catalyzed Cascade Annulation/C-H Activation of o-Ethynylanilines with Diazo Compounds: One-Pot Synthesis of Benzo[a]carbazoles via 1,4-Rhodium Migration.

    Science.gov (United States)

    Guo, Songjin; Yuan, Kai; Gu, Meng; Lin, Aijun; Yao, Hequan

    2016-10-05

    A Rh(III)-catalyzed cascade annulation/C-H activation of o-ethynylanilines with diazo compounds has been developed. This concise method allows for the rapid formation of a number of benzo[a]carbazoles in high yields, exhibiting good functional group tolerance and scalability. The key to the success of this approach involves one C-N bond and two C-C bond formation, and an aryl-to-aryl 1,4-rhodium migration.

  20. Design and synthesis of N-substituted indazole-3-carboxamides as poly(ADP-ribose)polymerase-1 (PARP-1) inhibitors(†).

    Science.gov (United States)

    Patel, Maulik R; Pandya, Kashyap G; Lau-Cam, Cesar A; Singh, Satyakam; Pino, Maria A; Billack, Blase; Degenhardt, Kurt; Talele, Tanaji T

    2012-04-01

    A group of novel N-1-substituted indazole-3-carboxamide derivatives were synthesized and evaluated as inhibitors of poly(ADP-ribose)polymerase-1 (PARP-1). A structure-based design strategy was applied to a weakly active unsubstituted 1H-indazole-3-carboxamide 2, by introducing a three carbon linker between 1H-indazole-3-carboxamide and different heterocycles, and led to compounds 4 [1-(3-(piperidine-1-yl)propyl)-1H-indazole-3-carboxamide, IC(50) =36μm] and 5 [1-(3-(2,3-dioxoindolin-1-yl)propyl)-1H-indazole-3-carboxamide, IC(50) = 6.8μm]. Compound 5 was evaluated in rats for its protective action against diabetes induced by a treatment with streptozotocin, a known diabetogenic agent. In addition to preserving the ability of the pancreas to secrete insulin, compound 5 was also able to attenuate the ensuing hyperglycemic response to a significant extent.

  1. Aromatic fluorine compounds. VI. Displacement of aryl fluorine in diazonium salts

    Science.gov (United States)

    Finger, G.C.; Oesterling, R.E.

    1956-01-01

    Several chlorofluorobenzenes have been isolated from the Schiemann synthesis of fluorobenzenes. These have been shown to be the products of two side reactions occurring during thermal decomposition of the dry benzenediazonium fluoborate salt containing coprecipitated sodium chloride, an unavoidable contaminant in large preparations involving the use of hydrochloric acid and sodium fluoborate. The major side reaction and its chloro product were unexpected; a unique displacement of fluorine ortho to the diazonium group was observed. Replacement of the diazo group with chlorine was the predicted side reaction which proved to be minor. Conditions causing the side reactions and the isolation and identification of the products are described.

  2. Synthesis and conformational study of some r(2), c(4)-bis(isopropoxycarbonyl)- t(3)-aryl- c(5)-hydroxy- t(5)-methylcyclohexanones using NMR spectra

    Science.gov (United States)

    Pandiarajan, K.; Mohan, R. T. Sabapathy; Murugavel, K.; Hema, R.

    2008-03-01

    Seven r(2), c(4)-bis(isopropoxycarbonyl)- t(3)-aryl- c(5)-hydroxy- t(5)-methylcyclohexanones 7- 13 (aryl = C 6H 5, p-ClC 6H 4, p-FC 6H 4, p-OMeC 6H 4, p-Me 2NC 6H 4, m-O 2NC 6H 4 and m-C 6H 5OC 6H 4) have been synthesized by condensing isopropyl acetoacetate with aromatic aldehydes in the presence of methylamine. For all these compounds 1H and 13C NMR spectra have been recorded. For 7, HOMOCOSY, NOESY, HSQC and HMBC spectra also have been recorded. The spectral data suggest that compounds 7- 13 exist in chair conformation with axial orientation of the hydroxy group and equatorial orientations of all the other substituents. Long range coupling is observed between OH proton and H(6a) in all cases suggesting that OH group is anti to C(5) sbnd C(6) bond. In all cases four distinct doublets are observed for the methyl protons of the two isopropyl groups. In 7 and 13 four separate, closely spaced signals are observed for the methyl carbons of the two isopropyl groups. All signals could be assigned unambiguously in the case of 7. The protons of one methyl group of the isopropoxycarbonyl group at C-4 seems to be highly shielded. This suggests that these protons lie above the plane of the aryl group at C(3). This conclusion is in accordance with the structure of 7, determined by X-ray crystallography. MOPAC calculations on 7 suggest that the chair conformation with OH group anti to C(5) sbnd C(6) bond is more stable than the chair conformation with OH bond anti to C(5) sbnd CH 3 bond by 1.5 kcal mol -1.

  3. Discovery of novel lead in the group of N-substituted piperazine ether derivatives with potential histamine H3 receptor activity.

    Science.gov (United States)

    Kuder, Kamil J; Stachnik, Marta; Schunack, Walter; Szymańska, Ewa; Kieć-Kononowicz, Katarzyna

    2014-01-01

    The search for novel lead from the group of various substituted N-piperazine ether derivatives was performed. Acyl- and pyridylpiperazine ethyl/propyl ethers were obtained via three different synthetic pathways. Affinity to histamine H3 receptor was established, as well as, for selected compounds, selectivity towards histamine H4R. Docking studies to the histamine H3R homology model strengthened the position of (4-(3-(4-(3-chlorobenzoyl)piperazin-1- yl)propoxy)phenyl)(cyclopropyl)methanone (compound 26) as a novel lead for further studies on histamine H3 receptor antagonist/inverse agonist.

  4. Oviposition and flight orientation response of Aedes aegypti to certain aromatic aryl hydrazono esters.

    Science.gov (United States)

    Guha, Lopamudra; Seenivasagan, T; Bandyopadhyay, Prabal; Iqbal, S Thanvir; Sathe, Manisha; Sharma, Pratibha; Parashar, B D; Kaushik, M P

    2012-09-01

    Aedes aegypti is a day-biting, highly anthropophilic mosquito and a potential vector of dengue and chikungunya in India. A. aegypti is a container breeder, generally oviposit in the stored and fresh water bodies, and discarded containers near residential areas that provide suitable habitats for oviposition by gravid females. The diurnal activity and endophilic nature of these mosquitoes have increased the frequency of contact with human being. Assured blood meal from human host in an infested area leads to increased disease occurrence. Gravid mosquitoes can potentially be lured to attractant-treated traps and could subsequently be killed with insecticides or growth regulators. In this direction, oviposition by A. aegypti females to aryl hydrazono esters (AHE)-treated bowls at 10 ppm concentration was tested in dual choice experiment, and their orientation response to these ester compounds was studied in Y-tube olfactometer. Among the esters tested, AHE-2, AHE-11 and AHE-12 elicited increased egg deposition with oviposition activity indices (OAI) of +0.39, +0.24 and +0.48, respectively, compared to control; in contrast, AHE-8, AHE-9 and AHE-10 showed negative oviposition response with OAI of -0.46, -0.35 and -0.29, respectively, at 10 mg/L. In the Y-tube olfactometer bioassay, AHE-2 attracted 60 % females compared to control, while to the odour of AHE-11 and AHE-12, about 70 % of the females were trapped in treated chambers. In contrast, only 27-30 % of gravid females entered the chamber releasing AHE-8, AHE-9 and AHE-10 odour plumes, while 70 % entered control chamber, evincing a possible non-preference of treatment odours as well as interference with olfactory receptors. These compounds have the potential for application as oviposition stimulants or deterrents for surveillance and control of mosquito population using ovitraps.

  5. Microwave Assisted Solvent Free Synthesis of Azomethines from Aryl Aldehydes on Melamin Formaldehyde as Solid Support

    Directory of Open Access Journals (Sweden)

    Ramin Rezaei

    2011-01-01

    Full Text Available Various aryl aldehydes underwent prompt one pot conversion into the corresponding azomethines in high yields by reacting with hydroxylamine hydrochloride supported on melamine formaldehyde under microwave irradiation.

  6. Synthesis and application of chiral N,N′-dialkylated cyclohexanediamine for asymmetric hydrogenation of aryl ketones

    Institute of Scientific and Technical Information of China (English)

    Meng Lin Ma; Chuan Hong Ren; Ya Jing Lv; Hua Chen; Xian Jun Li

    2011-01-01

    Chiral N,N′-dialkylated cyclohexanediamine derived ligands have been synthesized and used in the asymmetric hydrogenation of aryl ketones. Optically active alcohols with up to 90% enantiomeric excess were obtained in high yields.

  7. N-取代-3,5-二芳亚甲基-4-哌啶酮衍生物的合成与表征%Synthesis and characterization of N-substituted-3, 5-bis (arylidene)-4-piperidone derivatives

    Institute of Scientific and Technical Information of China (English)

    孙居锋; 李珂珂; 于晨; 代现平

    2011-01-01

    In order to research a kind of high potency, low tox-icity potential antitumour leading compounds,a few N-substi-tuted-3,5-bis(arylidene)-4-piperidones were synthesized taking N-substituted-4-piperidones and formaldehyde derivatives as starting materials with alcoholic NaOH or dry hydrogen chloride as catalyst by aldol condensation reaction inspected by TLC on the condition of 10 ℃ or 20 ℃ ,7 ~ 8 h,followed by recrystalization. The yield is over 49%. The structures were characterized by1 HNMR, X-ray crystallography with melting points. It was a convenient and efficient method in high yield. The compounds are used for antitumour evaluation in our next work.%为了研究一类高效低毒对耐药肿瘤有效的新型抗肿瘤先导化合物,以N-取代-4-哌啶酮和芳甲醛衍生物为原料,分别以氢氧化钠的乙醇溶液或干燥的氯化氢气体作催化剂,在10或20℃经过7~8h的羟醛缩合反应,TLC监测反应进程,最后经重结晶合成了3种标题化合物,收率达49%以上,并采用1HNMR、X-射线单晶衍射结合熔点对其结构进行了表征.该合成路线反应条件温和、操作简便,所得衍生物可用于下一步实验中抗肿瘤活性评价.

  8. An air-stable copper reagent for nucleophilic trifluoromethylthiolation of aryl halides

    KAUST Repository

    Weng, Zhiqiang

    2012-12-12

    A series of copper(I) trifluoromethyl thiolate complexes have been synthesized from the reaction of CuF2 with Me3SiCF 3 and S8 (see scheme; Cu red, F green, N blue, S yellow). These air-stable complexes serve as reagents for the efficient conversion of a wide range of aryl halides into the corresponding aryl trifluoromethyl thioethers in excellent yields. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  9. Donor-Appended N,C-Chelate Organoboron Compounds: Influence of Donor Strength on Photochromic Behaviour.

    Science.gov (United States)

    Mellerup, Soren K; Yuan, Kang; Nguyen, Carmen; Lu, Zheng-Hong; Wang, Suning

    2016-08-22

    Recently, four-coordinated N,C-chelate organoboron compounds have been found to show many interesting photochemical transformations depending on the nature of their chelating framework. As such, the effect of substitution on the chelate ligand has been well-established and understood, but the impact of the aryl groups attached to the boron atom remains less clear. To investigate the effect of enhanced charge-transfer character, a series of new N,C-chelate organoboron compounds with donor-functionalized aryl groups have been synthesized and characterized using NMR, UV/Vis, and electrochemical methods. These compounds were found to possess bright and tunable charge-transfer luminescence which is dependent on the donor strength of the amino substituent. In addition, some of these compounds undergo photochromic switching, producing dark isomers of various colors. This work establishes that donor-functionalization of the aryl groups in N,C-chelate boron compounds is an effective strategy for tuning both the photophysical and photochemical properties of such systems. The new findings also help elucidate the influence of electronic structure on the photoreactivity of N,C-chelate organoboron compounds which appears to be as important as steric crowding around the boron atom.

  10. Regioselectivity and Mechanism of Synthesizing N-Substituted 2-Pyridones and 2-Substituted Pyridines via Metal-Free C-O and C-N Bond-Cleaving of Oxazoline[3,2-a]pyridiniums

    Science.gov (United States)

    Li, Bo; Xue, Susu; Yang, Yang; Feng, Jia; Liu, Peng; Zhang, Yong; Zhu, Jianming; Xu, Zhijian; Hall, Adrian; Zhao, Bo; Shi, Jiye; Zhu, Weiliang

    2017-01-01

    Novel intermediate oxazoline[3,2-a]pyridiniums were facilely prepared from 2-(2,2-dimethoxyethoxy)-pyridines via acid promoted intramolecular cyclization. Sequentially, the quaternary ammonium salts were treated with different nucleophiles for performing regioselective metal-free C-O and C-N bond-cleaving to afford prevalent heterocyclic structures of N-substituted pyridones and 2-substituted pyridines. The reaction mechanism and regioselectivity were then systematically explored by quantum chemistry calculations at B3LYP/6-31 g(d) level. The calculated free energy barrier of the reactions revealed that aniline and aliphatic amines (e.g., methylamine) prefer to attack C8 of intermediate 4a, affording N-substituted pyridones, while phenylmethanamine, 2-phenylethan-1-amine and 3-phenylpropan-1-amine favor to attack C2 of the intermediate to form 2-substituted pyridines. With the optimized geometries of the transition states, we found that the aromatic ring of the phenyl aliphatic amines may form cation-π interaction with the pyridinium of the intermediates, which could stabilize the transition states and facilitate the formation of 2-substituted pyridines. PMID:28120894

  11. Synthesis of Stable Diarylpalladium(II) Complexes: Detailed Study of the Aryl-Aryl Bond-Forming Reductive Elimination.

    Science.gov (United States)

    Gensch, Tobias; Richter, Nils; Theumer, Gabriele; Kataeva, Olga; Knölker, Hans-Joachim

    2016-08-01

    The synthesis of diarylpalladium(II) complexes by twofold aryl C-H bond activation was developed. These intermediates of oxidative cyclization reactions are stabilized by chelation with acetyl groups while still maintaining sufficient reactivity to study their reductive elimination. Four distinct triggers were found for the reductive elimination of these complexes to dibenzofurans and carbazoles. Thermal elimination occurs at very high temperatures, whereas ligand-promoted and oxidatively induced reductive eliminations proceed readily at room temperature. Under these conditions, no isomerization occurs. In contrast, weak Brønsted acids, such as acetic acid, lead to a sequence of proto-demetalation, isomerization to a κ(3) -diarylpalladium(II) complex, and reductive elimination to non-symmetrical cyclization products.

  12. Synthesis, Density Functional Theory (DFT, Urease Inhibition and Antimicrobial Activities of 5-Aryl Thiophenes Bearing Sulphonylacetamide Moieties

    Directory of Open Access Journals (Sweden)

    Mnaza Noreen

    2015-11-01

    Full Text Available A variety of novel 5-aryl thiophenes 4a–g containing sulphonylacetamide (sulfacetamide groups were synthesized in appreciable yields via Pd[0] Suzuki cross coupling reactions. The structures of these newly synthesized compounds were determined using spectral data and elemental analysis. Density functional theory (DFT studies were performed using the B3LYP/6-31G (d, p basis set to gain insight into their structural properties. Frontier molecular orbital (FMOs analysis of all compounds 4a–g was computed at the same level of theory to get an idea about their kinetic stability. The molecular electrostatic potential (MEP mapping over the entire stabilized geometries of the molecules indicated the reactive sites. First hyperpolarizability analysis (nonlinear optical response were simulated at the B3LYP/6-31G (d, p level of theory as well. The compounds were further evaluated for their promising antibacterial and anti-urease activities. In this case, the antibacterial activities were estimated by the agar well diffusion method, whereas the anti-urease activities of these compounds were determined using the indophenol method by quantifying the evolved ammonia produced. The results revealed that all the sulfacetamide derivatives displayed antibacterial activity against Bacillus subtiles, Escherichia coli, Staphylococcus aureus, Shigella dysenteriae, Salmonella typhae, Pseudomonas aeruginosa at various concentrations. Furthermore, the compound 4g N-((5-(4-chlorophenylthiophen-2-ylsulfonyl acetamide showed excellent urease inhibition with percentage inhibition activity ~46.23 ± 0.11 at 15 µg/mL with IC50 17.1 µg/mL. Moreover, some other compounds 4a–f also exhibited very good inhibition against urease enzyme.

  13. Synthesis, Density Functional Theory (DFT), Urease Inhibition and Antimicrobial Activities of 5-Aryl Thiophenes Bearing Sulphonylacetamide Moieties.

    Science.gov (United States)

    Noreen, Mnaza; Rasool, Nasir; Gull, Yasmeen; Zubair, Muhammad; Mahmood, Tariq; Ayub, Khurshid; Nasim, Faiz-Ul-Hassan; Yaqoob, Asma; Zia-Ul-Haq, Muhammad; de Feo, Vincenzo

    2015-11-05

    A variety of novel 5-aryl thiophenes 4a-g containing sulphonylacetamide (sulfacetamide) groups were synthesized in appreciable yields via Pd[0] Suzuki cross coupling reactions. The structures of these newly synthesized compounds were determined using spectral data and elemental analysis. Density functional theory (DFT) studies were performed using the B3LYP/6-31G (d, p) basis set to gain insight into their structural properties. Frontier molecular orbital (FMOs) analysis of all compounds 4a-g was computed at the same level of theory to get an idea about their kinetic stability. The molecular electrostatic potential (MEP) mapping over the entire stabilized geometries of the molecules indicated the reactive sites. First hyperpolarizability analysis (nonlinear optical response) were simulated at the B3LYP/6-31G (d, p) level of theory as well. The compounds were further evaluated for their promising antibacterial and anti-urease activities. In this case, the antibacterial activities were estimated by the agar well diffusion method, whereas the anti-urease activities of these compounds were determined using the indophenol method by quantifying the evolved ammonia produced. The results revealed that all the sulfacetamide derivatives displayed antibacterial activity against Bacillus subtiles, Escherichia coli, Staphylococcus aureus, Shigella dysenteriae, Salmonella typhae, Pseudomonas aeruginosa at various concentrations. Furthermore, the compound 4g N-((5-(4-chlorophenyl)thiophen-2-yl)sulfonyl) acetamide showed excellent urease inhibition with percentage inhibition activity ~46.23 ± 0.11 at 15 µg/mL with IC50 17.1 µg/mL. Moreover, some other compounds 4a-f also exhibited very good inhibition against urease enzyme.

  14. Synthesis and Biological Evaluation of 3-Aryl-quinoxaline-2-carbonitrile 1,4-Di-N-oxide Derivatives as Hypoxic Selective Anti-tumor Agents

    Directory of Open Access Journals (Sweden)

    Yongzhou Hu

    2012-08-01

    Full Text Available A series of 3-aryl-2-quinoxaline-carbonitrile 1,4-di-N-oxide derivatives were designed, synthesized and evaluated for hypoxic and normoxic cytotoxic activity against human SMMC-7721, K562, KB, A549 and PC-3 cell lines. Many of these new compounds displayed more potent hypoxic cytotoxic activity compared with TX-402 and TPZ in the tumor cells based evaluation, which confirmed our hypothesis that the replacement of the 3-amine with the substituted aryl ring of TX-402 increases the hypoxic anti-tumor activity. The preliminary SAR revealed that 3-chloro was a favorable substituent in the phenyl ring for hypoxic cytotoxicity and 7-methyl or 7-methoxy substituted derivatives exhibited better hypoxic selectivity against most of the tested cell lines. The most potent compound, 7-methyl-3-(3-chlorophenyl-quinoxaline-2-carbonitrile 1,4-dioxide (9h was selected for further anti-tumor evaluation and mechanistic study. It also exhibited significant cytotoxic activity against BEL-7402, HepG2, HL-60, NCI-H460, HCT-116 and CHP126 cell lines in hypoxia with IC50 values ranging from 0.31 to 3.16 μM, and preliminary mechanism study revealed that 9h induced apoptosis in a caspase-dependent pathway.

  15. Synthesis and biological evaluation of 3-aryl-quinoxaline-2-carbonitrile 1,4-di-N-oxide derivatives as hypoxic selective anti-tumor agents.

    Science.gov (United States)

    Hu, Yunzhen; Xia, Qing; Shangguan, Shihao; Liu, Xiaowen; Hu, Yongzhou; Sheng, Rong

    2012-08-13

    A series of 3-aryl-2-quinoxaline-carbonitrile 1,4-di-N-oxide derivatives were designed, synthesized and evaluated for hypoxic and normoxic cytotoxic activity against human SMMC-7721, K562, KB, A549 and PC-3 cell lines. Many of these new compounds displayed more potent hypoxic cytotoxic activity compared with TX-402 and TPZ in the tumor cells based evaluation, which confirmed our hypothesis that the replacement of the 3-amine with the substituted aryl ring of TX-402 increases the hypoxic anti-tumor activity. The preliminary SAR revealed that 3-chloro was a favorable substituent in the phenyl ring for hypoxic cytotoxicity and 7-methyl or 7-methoxy substituted derivatives exhibited better hypoxic selectivity against most of the tested cell lines. The most potent compound, 7-methyl-3-(3-chlorophenyl)-quinoxaline-2-carbonitrile 1,4-dioxide (9h) was selected for further anti-tumor evaluation and mechanistic study. It also exhibited significant cytotoxic activity against BEL-7402, HepG2, HL-60, NCI-H460, HCT-116 and CHP126 cell lines in hypoxia with IC₅₀ values ranging from 0.31 to 3.16 μM, and preliminary mechanism study revealed that 9h induced apoptosis in a caspase-dependent pathway.

  16. Selective C-Arylation of 2,5-Dibromo-3-hexylthiophene via Suzuki Cross Coupling Reaction and Their Pharmacological Aspects

    Directory of Open Access Journals (Sweden)

    Hafiz Mansoor Ikram

    2015-03-01

    Full Text Available The present study reports the synthesis of various new derivatives based on 5-aryl-2-bromo-3-hexylthiophene with moderate-to-good yields via a palladium-catalyzed Suzuki cross-coupling reaction. This coupling method involved the reaction of 2,5-dibromo-3-hexylthiophene with several arylboronic acids in order to synthesize corresponding thiophene derivatives under controlled and optimal reaction conditions. The different substituents (CH3, OCH3, Cl, F etc. present on arylboronic acids are found to have significant electronic effects on the overall properties of new products. The synthesized thiophene molecules were studied for their haemolytic, biofilm inhibition and anti-thrombolytic activities, and almost all products showed potentially good properties. The compound 2-bromo-5-(3-chloro-4-fluorophenyl-3-hexylthiophenein particular exhibited the highest values for haemolytic and bio-film inhibition activities among all newly synthesized derivatives. In addition, the compound 2-bromo-3-hexyl-5-(4-iodophenylthiophene also showed high anti-thrombolytic activity, suggesting the potential medicinal applications of these newly synthesized compounds.

  17. Cell bioassays for detection of aryl hydrocarbon (AhR) and estrogen receptor (ER) mediated activity in environmental samples

    Energy Technology Data Exchange (ETDEWEB)

    Hilscherova, K. [Dept. of Environmental Chemistry and Toxicology, Faculty of Science, Masaryk Univ., Brno (Czech Republic); Machala, M. [Veterinary Research Inst. of Veterinary Medicine, Brno (Czech Republic); Kannan, K.; Giesy, J.P. [Dept. of Zoology, National Food Safety and Toxicology Center, Inst. for Environmental Toxicology, Michigan State Univ., East Lansing, MI (United States); Blankenship, A.L. [Dept. of Zoology, National Food Safety and Toxicology Center, Inst. for Environmental Toxicology, Michigan State Univ., East Lansing, MI (United States); ENTRIX Inc., East Lansing, MI (United States)

    2000-07-01

    In vitro cell bioassays are useful techniques for the determination of receptor-mediated activities in environmental samples containing complex mixtures of contaminants. The cell bioassays determine contamination by pollutants that act through specific modes of action. This article presents strategies for the evaluation of aryl hydrocarbon receptor (AhR)- (hereafter referred as dioxin-like) or estrogen receptor (ER)-mediated activities of potential endocrine disrupting compounds (EDCs) in complex environmental mixtures. Extracts from various types of environmental or food matrices can be tested by this technique to evaluate their 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (TCDD-EQs) or estrogenic equivalents (E{sub 2}-EQs) and to identify contaminated samples that need further investigation using resource-intensive instrumental analyses. Fractionation of sample extracts exhibiting significant activities, and subsequent reanalysis with the bioassays can identify important classes of contaminants that are responsible for the observed activity. Effect-directed chemical analysis is performed only for the active fractions to determine the responsible compounds. Mass-balance estimates of all major compounds contributing to the observed effects can be calculated to determine if all of the activity has been identified, and to assess the potential for interactions such as synergism or antagonism among contaminants present in the complex mixtures. The bioassay approach is an efficient (fast and cost effective) screening system to identify the samples of interest and to provide basic information for further analysis and risk evaluation. (orig.)

  18. N-alkanol-N-cyclohexanol amine aryl esters: Multidrug resistance (MDR) reversing agents with high potency and efficacy.

    Science.gov (United States)

    Teodori, Elisabetta; Dei, Silvia; Coronnello, Marcella; Floriddia, Elisa; Bartolucci, Gianluca; Manetti, Dina; Romanelli, Maria Novella; Santo Domingo Porqueras, Diego; Salerno, Milena

    2017-02-15

    In a continuing search for potent P-gp-dependent multidrug-resistant (MDR) reversers we synthesized and studied a new series of N-alkanol-N-cyclohexanol amine aryl esters characterized by the presence of two linkers with different flexibility: a polymethylene chain of variable length and a cyclohexylic scaffold, that gave origin to two geometrical isomers (cis and trans). The reversal activity of the new compounds was evaluated on the K562/DOX cell line by three tests: pirarubicin uptake modulation, doxorubicin cytotoxicity enhancement (reversal fold, RF) and inhibition of P-gp-mediated rhodamine-123 (Rhd 123) efflux tests. The chemical stability of their ester function was evaluated in the experimental conditions utilized (phosphate buffer solution (PBS), bovine serum and in the presence of K562/DOX cells) and in human plasma. The new series of molecules showed very interesting MDR reversing properties; in particular compound 5b (ELF26B), characterized by trans stereochemistry and a 5-methylene chain, presented the best pharmacological profile and is stable in each tested medium. Compound 5b could be an interesting lead for the development of new potent and efficacious P-gp-dependent MDR modulators.

  19. An Efficient and General Method for Formylation of Aryl Bromides with CO2 and Poly(methylhydrosiloxane).

    Science.gov (United States)

    Yu, Bo; Yang, Zhenzhen; Zhao, Yanfei; Hao, Leiduan; Zhang, Hongye; Gao, Xiang; Han, Buxing; Liu, Zhimin

    2016-01-18

    The formylation of aryl halides with CO2 to generate aryl aldehydes is challenging. Herein, we report a novel synthesis of aryl aldehydes by formylation of aryl bromides with CO2 and a waste silane, poly(methylhydrosiloxane) (PMHS). It has been discovered that a simple combination of 1,3-bis(diphenyphosphino)propane (DPPP)-chelated Pd catalyst, Pd(DPPP)Cl2 , with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) is able to effectively catalyze the reaction, leading to aryl aldehydes in moderate to excellent yields, and without any by-products in most cases. Moreover, this route could be extended to the formylation of aryl iodides with high efficiency. This approach is simple, less costly, and environmentally friendly, and also widens the applications of CO2 to form value-added chemicals by the construction of new C-C bonds.

  20. The synthesis of α-aryl-α-aminophosphonates and α-aryl-α-aminophosphine oxides by the microwave-assisted Pudovik reaction

    Science.gov (United States)

    Tajti, Ádám; Ádám, Anna; Csontos, István; Karaghiosoff, Konstantin; Czugler, Mátyás; Ábrányi-Balogh, Péter

    2017-01-01

    Summary A family of α-aryl-α-aminophosphonates and α-aryl-α-aminophosphine oxides was synthesized by the microwave-assisted solvent-free addition of dialkyl phosphites and diphenylphosphine oxide, respectively, to imines formed from benzaldehyde derivatives and primary amines. After optimization, the reactivity was mapped, and the fine mechanism was evaluated by DFT calculations. Two α-aminophosphonates were subjected to an X-ray study revealing a racemic dimer formation made through a N–H···O=P intermolecular hydrogen bridges pair.

  1. Studies of 5-aryl-4-(1H-benzo[d]imidazol-2-yl-1-(4-(naphthalen-2-ylthiazol-2-ylpyrrolidin-2-one Derivatives

    Directory of Open Access Journals (Sweden)

    Kandarp H. Patel

    2015-09-01

    Full Text Available Novel series of heterocyclic compounds 2-aryl-1-(4-(naphthalen-2-ylthiazol-2-yl-5-oxopyrrolidine-3-carboxylic acid derivatives (4a–h and 5-aryl-4-(1H-benzo[d]imidazol-2-yl-1-(4-(naphthalen-2-ylthiazol-2-yl pyrrolidin-2-one derivatives (5a–h have been synthesized by condensation of Schiff bases arylidine-[4-(2-naphthalenylthiazolyl]-2-amines (3a–h with succinic anhydride. Synthesized heterocyclic compounds were duly characterized by physico chemical parameters, 1H-NMR, 13C-NMR and FT–IR spectral features. Schiff bases 3a–h have been synthesized from 4-(naphthalen-2-ylthiazol-2-amine 1 and various aromatic aldehydes 2a–h. All novel synthesized compounds 4a–h and 5a–h were evaluated for their antibacterial activity against various Gram positive bacterial strains e.g. Bacillus subtilis [BS] and Staphylococcus aureus [SA] and Gram negative bacterial strains e.g. Salmonella typhimurium [ST] and Escherichia coli [EC]. Growth inhibition was compared with the standard drug ciprofloxacin. Antifungal activity was also carried out against different fungal strains e.g. Penicillium expansum [PE], Botryodiplodia theobromae [BT], Nigrospora sp. [NS], Trichothesium sp. [TS]. The antifungal drug, Ketoconazole was used as a positive control. Compounds 4a–h found less active as compare to compound 5a–h. DOI: http://dx.doi.org/10.17807/orbital.v7i3.723  

  2. Synthesis of 17beta-N-substituted 19-Nor-10-azasteroids as inhibitors of human 5alpha-reductases I and II.

    Science.gov (United States)

    Scarpi, Dina; Occhiato, Ernesto G; Danza, Giovanna; Serio, Mario; Guarna, Antonio

    2002-11-01

    The synthesis of 17beta-[N-(phenyl)methyl/phenyl-amido] substituted 10-azasteroids has been accomplished by either the TiCl4- or TMSOTf-catalysed reaction of carbamates 11 and 12 with Danishefsky's diene. The reaction provided 5alpha-H isomers 3a-5a and 5beta-H isomers 3b-5b depending on the reaction conditions. Both epimers of each compound were tested against human 5alpha-reductase types I and II. Unexpectedly, 5beta-H compounds were found more active than their 5alpha-H counterparts, the best inhibitors being 3b (IC50=279 and 2000 nM toward isoenzyme I and II, respectively) and 5b (IC50=913 and 247 nM toward isoenzymes I and II, respectively).

  3. Síntese de beta-N-acetilglicosaminídeos de arila modificados em C-6 como potenciais agentes antimicrobianos Synthesis of aryl beta-N-acetylglucosaminedes modified at C-6 as potential antimicrovial agents

    Directory of Open Access Journals (Sweden)

    Rozângela Magalhães Manfrini

    2008-01-01

    Full Text Available We report herein the synthesis of aryl beta-N-acetylglucosaminides containing azido, amino and acetamido groups at C-6 as potential antimicrobial agents. It was expected that these compounds could interfere with the biosynthesis and/or biotransformation of N-acetylglucosamine in fungi and bacteria. None of the compounds showed antimicrobial activity against bacteria (Bacillus subtilis, Micrococcus luteus, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, filamentous fungus (Aspergillus niger and yeasts (Saccharomyces cerevisae, Candida albicans and Candida tropicallis, at the concentration of 1 mg/mL in agar diffusion assay.

  4. Synthesis of aryl b-N-acetylglucosamine desmodified at C-6 as potential antimicrobial agents; Sintese de b-N-acetilglicosaminideos de arila modificados em C-6 como potenciais agentes antimicrobianos

    Energy Technology Data Exchange (ETDEWEB)

    Manfrini, Rozangela Magalhaes; Souza Filho, Jose Dias de [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Inst. de Ciencias Exatas; Figueireido, Rute Cunha; D' Angelis, Allison Fabiano; Prado, Maria Auxiliadora Fontes; Nunan, Elziria de Aguiar; Martins, Gabriela Aires; Alves, Ricardo Jose [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Faculdade de Farmacia. Dept. de Produtos Farmaceuticos]. E-mail: ricardodylan@farmacia.ufmg.br

    2008-07-01

    We report herein the synthesis of aryl beta-N-acetylglucosaminides containing azido, amino and acetamido groups at C-6 as potential antimicrobial agents. It was expected that these compounds could interfere with the biosynthesis and/or biotransformation of Nacetylglucosamine in fungi and bacteria. None of the compounds showed antimicrobial activity against bacteria (Bacillus subtilis, Micrococcus luteus, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa), filamentous fungus (Aspergillus niger) and yeasts (Saccharomyces cerevisae, Candida albicans and Candida tropicallis), at the concentration of 1 mg/mL in agar diffusion assay. (author)

  5. Merging Photoredox and Nickel Catalysis: The Direct Synthesis of Ketones by the Decarboxylative Arylation of α-Oxo Acids.

    Science.gov (United States)

    Chu, Lingling; Lipshultz, Jeffrey M; MacMillan, David W C

    2015-06-26

    The direct decarboxylative arylation of α-oxo acids has been achieved by synergistic visible-light-mediated photoredox and nickel catalysis. This method offers rapid entry to aryl and alkyl ketone architectures from simple α-oxo acid precursors via an acyl radical intermediate. Significant substrate scope is observed with respect to both the oxo acid and arene coupling partners. This mild decarboxylative arylation can also be utilized to efficiently access medicinal agents, as demonstrated by the rapid synthesis of fenofibrate.

  6. 1,3-Dicarbonyl compounds as phosphine-free ligands for Pd-catalyzed Heck and Suzuki reactions

    Institute of Scientific and Technical Information of China (English)

    Xin Cui; Juan Li; Lei Liu; Qing Xiang Guo

    2007-01-01

    Some 1,3-dicarbonyl compounds (such as pentane-2,4-dione and 3-oxo-N-phenylbutanamide) were found to constitute highly efficient, yet low-priced and phosphine-free ligands for the Pd-catalyzed Heck and Suzuki reactions of aryl bromides and iodides with very high turnover numbers (ca.103-104).

  7. Microwave-assisted cyclizations promoted by polyphosphoric acid esters: a general method for 1-aryl-2-iminoazacycloalkanes

    Science.gov (United States)

    Díaz, Jimena E; Mollo, María C

    2016-01-01

    Summary The first general procedure for the synthesis of 5 to 7-membered 1-aryl-2-iminoazacycloalkanes is presented, by microwave-assisted ring closure of ω-arylaminonitriles promoted by polyphosphoric acid (PPA) esters. 1-Aryl-2-iminopyrrolidines were easily prepared from the acyclic precursors employing a chloroformic solution of ethyl polyphosphate (PPE). The use of trimethylsilyl polyphosphate (PPSE) in solvent-free conditions allowed for the synthesis of 1-aryl-2-iminopiperidines and hitherto unreported 1-aryl-2-iminoazepanes. The cyclization reaction involves good to high yields and short reaction times, and represents a novel application of PPA esters in heterocyclic synthesis. PMID:27829907

  8. Microwave-assisted cyclizations promoted by polyphosphoric acid esters: a general method for 1-aryl-2-iminoazacycloalkanes

    Directory of Open Access Journals (Sweden)

    Jimena E. Díaz

    2016-09-01

    Full Text Available The first general procedure for the synthesis of 5 to 7-membered 1-aryl-2-iminoazacycloalkanes is presented, by microwave-assisted ring closure of ω-arylaminonitriles promoted by polyphosphoric acid (PPA esters. 1-Aryl-2-iminopyrrolidines were easily prepared from the acyclic precursors employing a chloroformic solution of ethyl polyphosphate (PPE. The use of trimethylsilyl polyphosphate (PPSE in solvent-free conditions allowed for the synthesis of 1-aryl-2-iminopiperidines and hitherto unreported 1-aryl-2-iminoazepanes. The cyclization reaction involves good to high yields and short reaction times, and represents a novel application of PPA esters in heterocyclic synthesis.

  9. Evaluation of sensitizers found in wastewater from paper recycling areas, and their activation of the aryl hydrocarbon receptor in vitro.

    Science.gov (United States)

    Terasaki, Masanori; Yasuda, Michiko; Shimoi, Kayoko; Jozuka, Kazuhiko; Makino, Masakazu; Shiraishi, Fujio; Nakajima, Daisuke

    2014-09-15

    The in vitro potential of sensitizers and related compounds (SRCs) originating from impurities in waste paper in activating the human aryl hydrocarbon receptor (AhR) α was assessed using yeast reporter gene as well as cytochrome P450 (CYP)1A1 and ethoxyresorufin O-deethylase (EROD) assays. In the yeast assay, eight compounds exhibited agonist activity, and their activity relative to β-naphthoflavone (BNF) ranged from 1.4 × 10(-4) to 8.3 × 10(-2), with the highest activity observed for benzyl 2-naphthyl ether (BNE). In the EROD assay, six compounds caused a more significant induction of CYP1A-dependent activity than did the vehicle control at 50 μM (ppaper recycling area was fractioned using solid-phase extraction (SPE) combined with a C18 disk and florisil cartridge. In gas chromatography-mass spectrometry (GC-MS) analysis, SRCs were detected in the first fraction, at a total concentration of 5.5 μg/L. This fraction also activated AhR, and its activity, expressed as a BNF equivalent value, was 0.42 nM in the yeast assay. The contribution ratio of active compounds accounted for up to 34% and 4.4% observed activity of the fraction and total samples, respectively. To our knowledge, this is the first study to show that paper industry-related compounds, namely aromatic sensitizers, activate AhR by using a yeast assay and HepG2 cells.

  10. In vitro screening of 1-aryl-6-hydroxy-1,2,3,4-tetrahydroisoquinolines: structure related activity against pathogenic bacteria

    Institute of Scientific and Technical Information of China (English)

    Moses; Njutain; Ngemenya; Joelle; Ngo; Hanna; Julios; Armand; Komtchou; Simon; Mbua; Ngale; Efange

    2015-01-01

    Objective: To evaluate the antibacterial activity of ten synthetic tetrahydroisoquinolines against eight bacterial strains. Methods: The ten tetrahydroisoquinolines synthesized via base-catalyzed Pictet-Spengler cyclization were screened against a total of eight bacterial strains comprising control and pathogenic strains by the disc diffusion and micro-dilution methods. The most active compound was then assessed for cytotoxicity on human lymphocytes. Results: Six of the tetrahydroisoquinolines showed broad spectrum bacteriostatic activity. The zones of inhibition produced ranged from 7 to 23 mm for 200 μg per disc. The presence of a lipophilic substituent at the para position of the pendant phenyl group conferred the highest antibacterial activity. Compound 2 [1-(3,4-chlorophenyl)-6-hydroxy-1,2,3,4-tetrahydroisoquinoline] was the most active and produced zones ranging from 9 to 20 mm against all eight bacterial strains. Compound 2 also showed the lowest minimum inhibitory concentration of 100 μg/mL against Escherichia coli ATCC11775 and the lowest minimum bactericidal concentration of 800 μg/mL against pathogenic Salmonella typhimurium. Overall, compound 2 was the most active with bacteriostatic and bactericidal activity against three and four bacterial strains respectively. A 50% cytotoxic concentration of 98.2 μg/mL was recorded for compound 2 indicating a low risk of toxicity. Conclusions: The 1-aryl-1,2,3,4-tetrahydroisoquinolines display structure-related antibacterial activity and further chemical exploration of the tetrahydroisoquinoline scaf old may yield more potent non-toxic derivatives for development into new antibacterials.

  11. Synthesis, crystal structure and characterization of new biologically active Cu(II) complexes with ligand derived from N-substituted sulfonamide

    Indian Academy of Sciences (India)

    ADRIANA CORINA HANGAN; ALEXANDRU TURZA; ROXANA LIANA STAN; BOGDAN SEVASTRE; EMÖKE PÁLL; SÎNZIANA CETEAN; LUMINI¸TA SIMONA OPREAN

    2016-05-01

    A new N-sulfonamide ligand (HL1= N-(5-(4-methoxyphenyl)-[1,3,4]–thiadiazole–2-yl)-toluenesulfonamide)and two Cu(II) complexes, $[Cu(L1)­_{2}(py)_{2}]$ (C1) and $[Cu(L2)_{2}(py)_{2}(H_{2}O)]$ (C2) (HL2 = N-(5-(4-methylphenyl)-[1,3,4]–thiadiazole–2-yl)-benzenesulfonamide) were synthesized. The X-ray crystal structuresof the complexes were determined. In the complex C1, the Cu(II) ion is four-coordinated, forming a $CuN_{4}$ chromophore and in the complex C2, the Cu(II) ion is five-coordinated, forming a $CuN_{4}O$ chromophore. Theligand acts as monodentate, coordinating the Cu(II) ion through a single $N_{thiadiazole}$ atom. The molecules fromthe reaction medium (pyridine and water) are also involved in the coordination of the Cu(II) ion. The complexesC1 and C2 are square-planar and a slightly distorted square pyramidal, respectively. The compounds werecharacterized by FT-IR, electronic, EPR spectroscopic and magnetic methods. The nuclease binding activitystudies of the synthesized complexes confirm their capacity to cleave the DNA molecule. The cytotoxicitystudies were carried out on melanoma cell line WM35 which confirm that both compounds inhibit the growthof these cells. They have a higher activity compared to a platinum drug, carboplatin.

  12. Are styrene oligomers in coastal sediments of an industrial area aryl hydrocarbon-receptor agonists?

    Science.gov (United States)

    Hong, Seongjin; Lee, Junghyun; Lee, Changkeun; Yoon, Seo Joon; Jeon, Seungyeon; Kwon, Bong-Oh; Lee, Jong-Hyeon; Giesy, John P; Khim, Jong Seong

    2016-06-01

    Effect-directed analysis (EDA) was performed to identify the major aryl hydrocarbon receptor (AhR) agonists in sediments collected from a highly industrialized area (Lake Shihwa, Korea). Great AhR-mediated potencies were found in fractions containing aromatic compounds with log Kow values of 5-8, and relatively great concentrations of styrene oligomers (SOs) and polycyclic aromatic hydrocarbons (PAHs) were detected in those fractions. Until now, there was little information on occurrences and toxic relative potencies (RePs) of SOs in coastal environments. In the present study; i) distributions and compositions, ii) AhR binding affinities, and iii) contributions of SOs to total AhR-mediated potencies were determined in coastal sediments. Elevated concentrations of 10 SOs were detected in sediments of inland creeks ranging from 61 to 740 ng g(-1) dry mass (dm), while lesser concentrations were found in inner (mean = 33 ng g(-1) dm) and outer regions (mean = 25 ng g(-1) dm) of the lake. Concentrations of PAHs in sediments were comparable to those of SOs. 2,4-diphenyl-1-butene (SD3) was the predominant SO analogue in sediments. SOs and PAHs were accumulated in sediments near sources, and could not be transported to remote regions due to their hydrophobicity. RePs of 3 SOs could be derived, which were 1000- to 10,000-fold less than that of one representative potent AhR active PAH, benzo[a]pyrene. Although concentrations of SOs in sediments were comparable to those of PAHs, the collective contribution of SOs to total AhR-mediated potencies were rather small (coastal environment.

  13. Evodiamine as a novel antagonist of aryl hydrocarbon receptor

    Energy Technology Data Exchange (ETDEWEB)

    Yu, Hui [State Key Laboratory of Trauma, Burns, and Combined Injury, Department 1, Research Institute of Surgery, Daping Hospital, The Third Military Medical University, Chongqing 400042 (China); Department of Laboratory Medicine, The Affiliated Tenth People' s Hospital, Tongji University, Shanghai 200072 (China); Tu, Yongjiu; Zhang, Chun; Fan, Xia; Wang, Xi [State Key Laboratory of Trauma, Burns, and Combined Injury, Department 1, Research Institute of Surgery, Daping Hospital, The Third Military Medical University, Chongqing 400042 (China); Wang, Zhanli [College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014 (China); Liang, Huaping, E-mail: huaping_liang@yahoo.com.cn [State Key Laboratory of Trauma, Burns, and Combined Injury, Department 1, Research Institute of Surgery, Daping Hospital, The Third Military Medical University, Chongqing 400042 (China)

    2010-11-05

    Research highlights: {yields} Evodiamine interacted with the AhR. {yields} Evodiamine inhibited the specific binding of [{sup 3}H]-TCDD to the AhR. {yields} Evodiamine acts as an antagonist of the AhR. -- Abstract: Evodiamine, the major bioactive alkaloid isolated from Wu-Chu-Yu, has been shown to interact with a wide variety of proteins and modify their expression and activities. In this study, we investigated the interaction between evodiamine and the aryl hydrocarbon receptor (AhR). Molecular modeling results revealed that evodiamine directly interacted with the AhR. Cytosolic receptor binding assay also provided the evidence that evodiamine could interact with the AhR with the K{sub i} value of 28.4 {+-} 4.9 nM. In addition, we observed that evodiamine suppressed the 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) induced nuclear translocation of the AhR and the expression of CYP1A1 dose-dependently. These results suggested that evodiamine was able to bind to the AhR as ligand and exhibit antagonistic effects.

  14. Regioselective synthesis of C3 alkylated and arylated benzothiophenes

    Science.gov (United States)

    Shrives, Harry J.; Fernández-Salas, José A.; Hedtke, Christin; Pulis, Alexander P.; Procter, David J.

    2017-03-01

    Benzothiophenes are heterocyclic constituents of important molecules relevant to society, including those with the potential to meet modern medical challenges. The construction of molecules would be vastly more efficient if carbon-hydrogen bonds, found in all organic molecules, can be directly converted into carbon-carbon bonds. In the case of elaborating benzothiophenes, functionalization of carbon-hydrogen bonds at carbon-number 3 (C3) is markedly more demanding than at C2 due to issues of regioselectivity (C3 versus C2), and the requirement of high temperatures, precious metals and the installation of superfluous directing groups. Herein, we demonstrate that synthetically unexplored but readily accessible benzothiophene S-oxides serve as novel precursors for C3-functionalized benzothiophenes. Employing an interrupted Pummerer reaction to capture and then deliver phenol and silane coupling partners, we have discovered a directing group-free method that delivers C3-arylated and -alkylated benzothiophenes with complete regioselectivity, under metal-free and mild conditions.

  15. Cu(OAc)2/Pyrimidines-Catalyzed Cross-coupling Reactions of Aryl Iodides and Activated Aryl Bromides with Alkynes under Aerobic, Solvent-free and Palladium-free Conditions

    Institute of Scientific and Technical Information of China (English)

    XIE Ye-Xiang; DENG Chen-Liang; PI Shao-Feng; LI Jin-Heng; YIN Du-Lin

    2006-01-01

    Excellent results have been achieved in the Cu(OAc)2-catalyzed Sonogashira cross-couplings of aryl iodides and activated aryl bromides utilizing TBAF (tetrabutylammonium fluoride) as the base and 4,6-dimethoxypyrimidin-2-amine as the ligand. It is noteworthy that the reaction is conducted under aerobic, solvent-free and palladium-free conditions.

  16. QSAR study of 4-aryl-4H-chromenes as a new series of apoptosis inducers using different chemometric tools.

    Science.gov (United States)

    Khoshneviszadeh, Mehdi; Edraki, Najmeh; Miri, Ramin; Foroumadi, Alireza; Hemmateenejad, Bahram

    2012-04-01

    The apoptosis-inducing activity data of a series of 4-aryl-4H-chromenes based on three cell lines (human breast cancer cell line T47D, human non-smal cell lung cancer cell line H1299, and human colorectal cancer cell line DLD-1) have been subjected to quantitative structure-activity relationship (QSAR) analysis. A collection of chemometrics methods including multiple linear regression (MLR), factor analysis-based multiple linear regression (FA-MLR), principal component regression (PCR), and partial least squared combined with genetic algorithm for variable selection (GA-PLS) were employed to make connections between structural parameters and induction of apoptosis in three different cell lines. Models of high statistical qualities were obtained for each cell line using GA-PLS method. The results revealed that 2D autocorrelation descriptors and dipole moments as a quantum chemical parameter are important structural parameters that significantly influence the activity in all three types of cell lines. However, the determinant descriptors for activity of compounds in H1299 cell line were partly different from the two other cell lines, which might be deduce that the studied compounds induce apoptosis through a different mechanism of action.

  17. Phosphine-Free Palladium-Catalyzed Direct C-3 Arylation of 2-Phenylimidazo[1,2-a]pyridine Using Silver(I Carboxylate

    Directory of Open Access Journals (Sweden)

    Sridevi Kona

    2013-01-01

    Full Text Available Phosphine-free palladium-catalyzed direct arylation of 2-phenyl-imidazo[1,2-a]pyridine has been developed with the concept of using silver(I carboxylate. This protocol efficiently catalyzes the C-H arylation of 2-phenyl-imidazo[1,2-a]pyridine with aryl iodides to afford the corresponding 2-phenyl-3-aryl-imidazo[1,2-a]pyridines in moderate to-good yields.

  18. Expedient synthesis of C-aryl carbohydrates by consecutive biocatalytic benzoin and aldol reactions.

    Science.gov (United States)

    Hernández, Karel; Parella, Teodor; Joglar, Jesús; Bujons, Jordi; Pohl, Martina; Clapés, Pere

    2015-02-16

    The introduction of aromatic residues connected by a C-C bond into the non-reducing end of carbohydrates is highly significant for the development of innovative structures with improved binding affinity and selectivity (e.g., C-aril-sLex). In this work, an expedient asymmetric "de novo" synthetic route to new aryl carbohydrate derivatives based on two sequential stereoselectively biocatalytic carboligation reactions is presented. First, the benzoin reaction of aromatic aldehydes to dimethoxyacetaldehyde is conducted, catalyzed by benzaldehyde lyase from Pseudomonas fluorescens biovar I. Then, the α-hydroxyketones formed are reduced by using NaBH4 yielding the anti diol. After acetal hydrolysis, the aldol addition of dihydroxyacetone, hydroxyacetone, or glycolaldehyde catalyzed by the stereocomplementary D-fructose-6-phosphate aldolase and L-rhamnulose-1-phosphate aldolase is performed. Both aldolases accept unphosphorylated donor substrates, avoiding the need of handling the phosphate group that the dihydroxyacetone phosphate-dependent aldolases require. In this way, 6-C-aryl-L-sorbose, 6-C-aryl-L-fructose, 6-C-aryl-L-tagatose, and 5-C-aryl-L-xylose derivatives are prepared by using this methodology.

  19. Palladium-catalyzed α-arylation of zinc enolates of esters: reaction conditions and substrate scope.

    Science.gov (United States)

    Hama, Takuo; Ge, Shaozhong; Hartwig, John F

    2013-09-06

    The intermolecular α-arylation of esters by palladium-catalyzed coupling of aryl bromides with zinc enolates of esters is reported. Reactions of three different types of zinc enolates have been developed. α-Arylation of esters occurs in high yields with isolated Reformatsky reagents, with Reformatsky reagents generated from α-bromo esters and activated zinc, and with zinc enolates generated by quenching alkali metal enolates of esters with zinc chloride. The use of zinc enolates, instead of alkali metal enolates, greatly expands the scope of the arylation of esters. The reactions occur at room temperature or at 70 °C with bromoarenes containing cyano, nitro, ester, keto, fluoro, enolizable hydrogen, hydroxyl, or amino functionality and with bromopyridines. The scope of esters encompasses acyclic acetates, propionates, and isobutyrates, α-alkoxyesters, and lactones. The arylation of zinc enolates of esters was conducted with catalysts bearing the hindered pentaphenylferrocenyl di-tert-butylphosphine (Q-phos) or the highly reactive dimeric Pd(I) complex {[P(t-Bu)3]PdBr}2.

  20. Mechanistic Aspects of Aryl-Halide Oxidative Addition, Coordination Chemistry, and Ring-Walking by Palladium.

    Science.gov (United States)

    Zenkina, Olena V; Gidron, Ori; Shimon, Linda J W; Iron, Mark A; van der Boom, Milko E

    2015-11-01

    This contribution describes the reactivity of a zero-valent palladium phosphine complex with substrates that contain both an aryl halide moiety and an unsaturated carbon-carbon bond. Although η(2) -coordination of the metal center to a C=C or C≡C unit is kinetically favored, aryl halide bond activation is favored thermodynamically. These quantitative transformations proceed under mild reaction conditions in solution or in the solid state. Kinetic measurements indicate that formation of η(2) -coordination complexes are not nonproductive side-equilibria, but observable (and in several cases even isolated) intermediates en route to aryl halide bond cleavage. At the same time, DFT calculations show that the reaction with palladium may proceed through a dissociation-oxidative addition mechanism rather than through a haptotropic intramolecular process (i.e., ring walking). Furthermore, the transition state involves coordination of a third phosphine to the palladium center, which is lost during the oxidative addition as the C-halide bond is being broken. Interestingly, selective activation of aryl halides has been demonstrated by adding reactive aryl halides to the η(2) -coordination complexes. The product distribution can be controlled by the concentration of the reactants and/or the presence of excess phosphine.

  1. Synthesis and evaluation of 2-(5-(aryl)-1,3,4-oxadiazol-2-ylthio)-N-(3-(trifluoromethyl)phenyl)acetamides and N-(4-chloro-3-fluorophenyl)-2-(5-(aryl)-1,3,4-oxadiazol-2-ylthio)acetamides as antimicrobial agents

    Indian Academy of Sciences (India)

    Kalpesh Parikh; Deepkumar Joshi

    2014-05-01

    A series of 2-mercapto-5-phenyl-1,3,4-oxadiazole derivatives have been condensed with different phenyl acetamide derivatives possessing fluorine atom at meta position; resulting in the formation of 2-(5-aryl- 1,3,4-oxadiazol-2-ylthio)-N-(3-(trifluoromethyl)phenyl)acetamide (5a-j) and N-(4-chloro-3-fluorophenyl)-2-(5-aryl-1,3,4-oxadiazol-2-ylthio)acetamide (5k-t) derivatives. The antimicrobial properties of the synthesized entities (5a-t) measured as their MIC (Minimum Inhibitory Concentration) values were evaluated by using the broth dilution method against Gram-positive bacteria (S. aureus and E. faecalis), Gram-negative bacteria (E. coli and P. aeruginosa) and fungi (C. albicans and A. niger). The results of antimicrobial activities (in g/ml) revealed the fact that the compounds 5a and g bearing a maximum number of fluorine atoms showed the highest potency among the synthesized compounds against the broad panel of bacterial and fungal strains. The presence of fluorine atom at the meta position in the phenyl ring of final derivatives (5a-t) brought about an enhancement of their antimicrobial properties to a notable extent.

  2. Efficient N-Arylation and N-Alkenylation of the Five DNA/RNANucleobases

    DEFF Research Database (Denmark)

    Jacobsen, Mikkel Fog; Knudsen, Martin M.; Gothelf, Kurt Vesterager

    2006-01-01

    -substituted pyrimidin-2(1H)-one served as both a cytosine and a uracil precursor and was N-arylated and N-alkenylated in high yields. Adenine was efficiently and selectively N-arylated and N-alkenylated at the N9 position by employing a bis-Boc-protected adenine derivative, while a bis-Boc-protected 2-amino-6...

  3. Dramatic Substituent Effect on the CCL-catalyzed Kinetic Resolution of 1-Aryl-2,3-allenols

    Institute of Scientific and Technical Information of China (English)

    XU, Dai-Wang(徐代旺); LI, Zu-Yi(李祖义); MA, Sheng-Ming(麻生明)

    2004-01-01

    Optically active 1-aryl-2,3-allenols were obtained via CCL-mediated kinetic resolution of the racemic allenols. The substitution pattern of the aromatic ring, regarding to both the type of the substituent and its position on the aromatic ring, was found to be critical for the kinetic resolution of 1-aryl-2,3-allenols.

  4. Copper-Catalyzed N-Arylation of Amides Using (S-N-Methylpyrrolidine-2-carboxylate as the Ligand

    Directory of Open Access Journals (Sweden)

    Dong-Sheng Ma

    2010-03-01

    Full Text Available (S-N-methylpyrrolidine-2-carboxylate, a derivative of natural L-proline, was found to be an efficient ligand for the copper-catalyzed Goldberg-type N-arylation of amides with aryl halides under mild conditions. A variety of N-arylamides were synthesized in good to high yields.

  5. Synthesis of radiolabelled aryl azides from diazonium salts: experimental and computational results permit the identification of the preferred mechanism.

    Science.gov (United States)

    Joshi, Sameer M; de Cózar, Abel; Gómez-Vallejo, Vanessa; Koziorowski, Jacek; Llop, Jordi; Cossío, Fernando P

    2015-05-28

    Experimental and computational studies on the formation of aryl azides from the corresponding diazonium salts support a stepwise mechanism via acyclic zwitterionic intermediates. The low energy barriers associated with both transition structures are compatible with very fast and efficient processes, thus making this method suitable for the chemical synthesis of radiolabelled aryl azides.

  6. Homocoupling of aryl halides in flow: Space integration of lithiation and FeCl3 promoted homocoupling

    Directory of Open Access Journals (Sweden)

    Aiichiro Nagaki

    2011-08-01

    Full Text Available The use of FeCl3 resulted in a fast homocoupling of aryllithiums, and this enabled its integration with the halogen–lithium exchange reaction of aryl halides in a flow microreactor. This system allows the homocoupling of two aryl halides bearing electrophilic functional groups, such as CN and NO2, in under a minute.

  7. Dithiocarbamate promoted practical synthesis of N-Aryl-2-aminobenzazoles: Synthesis of novel Aurora-A kinase inhibitor

    Indian Academy of Sciences (India)

    Naresh Kumar Katari; M Venkatanarayana; Kummari Srinivas

    2015-03-01

    Various N-aryl-2-aminobenzoxazoles and N-aryl-2-aminobenzothiazoles were synthesized from o-aminophenol and o-aminothiophenol, respectively, mediated by dithiocarbamate in one step. The salient features of this method include mild reaction condition, high yield and large scale synthesis. Application of this methodology has been demonstrated by synthesizing potent Aurora kinase-A inhibitors.

  8. Regioselective Multi-component Synthesis of 7-Aryl-benzo[h][1,2,4]-triazolo[5,1-b]quinazoline-5,6-diones Catalyzed by n-Propylsulfonated γ-Al{sub 2}O{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Li, Weilin; Tian, Shuanbao; Wu, Liqiang [Xinxiang Medical Univ., Xinxiang (China)

    2013-09-15

    We have developed a straightforward method for the synthesis of 7-aryl-benzo[h][1,2,4]-triazolo[5,1-b] quinazoline-5,6-dione derivatives by nano n-propylsulfonated γ-Al{sub 2}O{sub 3} catalyzed three-component reaction of aldehyde, 2-hydroxy-1,4-naphthoquinone and 3-amino-1,2,4-triazole. A series of 7-aryl-benzo[h][1,2,4]-triazolo[5,1-b]quinazoline-5,6-dione derivatives have been synthesized in excellent yield (85-96%). The catalyst can be recycled up to six cycles without much decrease in catalytic activity. Environment friendly catalyst, high regioselectivity and good yield are the advantages of the method. To the best of our knowledge this is the first report on synthesis of 7-aryl-benzo[h][1,2,4]-triazolo[5,1-b]quinazoline-5,6-dione derivatives. We are evaluating anticancer activity of 4, which will be published elsewhere. Naphthoquinones constitute a major class of naturally occurring compounds, and interests in their chemistry continues unabated because of their wide range of biological and therapeutic properties such as antioxidant, antifungal, anti-inflammatory, antiallergic, antiviral, and anticancer activity.

  9. Discovery of highly selective and potent monoamine oxidase B inhibitors: Contribution of additional phenyl rings introduced into 2-aryl-1,3,4-oxadiazin-5(6H)-one.

    Science.gov (United States)

    Lee, Jungeun; Lee, Yeongcheol; Park, So Jung; Lee, Joohee; Kim, Yeong Shik; Suh, Young-Ger; Lee, Jeeyeon

    2017-03-01

    Monoamine oxidase B (MAO-B) is a flavin adenine dinucleotide (FAD)-containing enzyme that plays a major role in the oxidative deamination of biogenic amines and neurotransmitters. Inhibiting MAO-B activity is a promising approach in the treatment of neurological disorders. Here, we report a series of 2-aryl-1,3,4-oxadiazin-5(6H)-one derivatives as highly selective and potent MAO-B inhibitors. Analysis of the binding sites of hMAO-A and hMAO-B led to design of linear analogs of 2-aryl-1,3,4-oxadiazin-5(6H)-one with an additional phenyl ring. Biological evaluation of the 26 new derivatives resulted in the identification of highly potent and selective inhibitors with optimal physicochemical properties to potentially cross the blood-brain barrier (BBB). Compounds 18a, 18b, 18e and 25b potently inhibited MAO-B, with IC50 values of 4-25 nM and excellent SI over MAO-A (18a > 25000, 18b > 8333 and 18e > 4000 and 25b > 4545). Docking results suggest that an optimal linker between two aromatic rings on the 2-aryl-1,3,4-oxadiazin-5(6H)-one scaffold is a key element in the binding and inhibition of MAO-B.

  10. π-Extension of a 4-ethoxy-1,3-thiazole via aryl alkyne cross coupling: synthesis and exploration of the electronic structure.

    Science.gov (United States)

    Habenicht, Stefanie H; Schramm, Stefan; Zhu, Mingming; Freund, Robert R A; Langenstück, Teresa; Strathausen, Rainer; Weiss, Dieter; Biskup, Christoph; Beckert, Rainer

    2015-11-01

    A series of four donor aryl alkynyl substituted thiazole derivatives 3a-d and three similar aryl donor-acceptor systems 6a-c have been synthesized. All compounds bear different electron-donating groups in the 5-position of the thiazole core. The influence of both electron donor strength and the additional phenylethynyl unit on photophysical properties, i.e. UV/Vis absorption, fluorescence emission and fluorescence lifetime, has been evaluated. Additionally, theoretical calculations have been performed at the CAM-B3LYP/6-31+G(d,p) level and good agreement with the experimental data has been achieved. The new derivatives synthesized via palladium catalyzed cross coupling are characterised by moderately strong emission between 474 and 538 nm (ΦF = 0.35-0.39) and Stokes' shifts ranging from 0.54 to 0.79 eV (4392-6351 cm(-1)). The smaller chromophores of type 6 exhibit modest to high fluorescence emission (ΦF = 0.45-0.76) between 470 and 529 nm and their Stokes' shifts range from 0.59 to 0.65 eV (4765-5251 cm(-1)).

  11. Structural, spectroscopic, magnetic and electrochemical studies of monomer N-substituted-sulfanilamide copper (II) complex with 2,2‧-bipyridine

    Science.gov (United States)

    Öztürk, Filiz; Bulut, İclal; Bulut, Ahmet

    2015-03-01

    A novel copper (II) complex of sulfamethazine (4-amino-N-[4,6-dimethyl-2-pyrimidinyl] benzene sulfonamide, Hsmz) ([Cu(smz)2bipy]ṡ0.8H2O; bipy: 2,2‧-bipyridine) has been synthesized and characterized by single crystal X-ray diffraction, EPR, IR, UV-vis and electrochemical methods. The single crystal X-ray analysis indicated that the compound crystallizes in the monoclinic space group P21/c with Z = 4. The central copper (II) ion is coordinated by two bidentate sulfamethazine anions through the nitrogen atoms together with one bidentate 2,2‧-bipyridine ligand forming the octahedral geometry. The characteristic vibration bands support the X-ray analysis results. The EPR spectral analysis has led to that the ground state wave function of the unpaired electron of copper ion is dx2-y2 (2B1g state) and also indicated that the metal ions are located in distorted octahedral sites (D4h) elongated along the z-axis. The electrochemical studies of the complex were also carried out to determine the active sites of the ligands. The cyclic and square wave voltammetric techniques have been used to determine the complex.

  12. Aryl Polyenes, a Highly Abundant Class of Bacterial Natural Products, Are Functionally Related to Antioxidative Carotenoids.

    Science.gov (United States)

    Schöner, Tim A; Gassel, Sören; Osawa, Ayako; Tobias, Nicholas J; Okuno, Yukari; Sakakibara, Yui; Shindo, Kazutoshi; Sandmann, Gerhard; Bode, Helge B

    2016-02-02

    Bacterial pigments of the aryl polyene type are structurally similar to the well-known carotenoids with respect to their polyene systems. Their biosynthetic gene cluster is widespread in taxonomically distant bacteria, and four classes of such pigments have been found. Here we report the structure elucidation of the aryl polyene/dialkylresorcinol hybrid pigments of Variovorax paradoxus B4 by HPLC-UV-MS, MALDI-MS and NMR. Furthermore, we show for the first time that this pigment class protects the bacterium from reactive oxygen species, similarly to what is known for carotenoids. An analysis of the distribution of biosynthetic genes for aryl polyenes and carotenoids in bacterial genomes is presented; it shows a complementary distribution of these protective pigments in bacteria.

  13. A General Palladium-Catalyzed Hiyama Cross-Coupling Reaction of Aryl and Heteroaryl Chlorides.

    Science.gov (United States)

    Yuen, On Ying; So, Chau Ming; Man, Ho Wing; Kwong, Fuk Yee

    2016-05-01

    A general palladium-catalyzed Hiyama cross-coupling reaction of aryl and heteroaryl chlorides with aryl and heteroaryl trialkoxysilanes by a Pd(OAc)2 /L2 catalytic system is presented. A newly developed water addition protocol can dramatically improve the product yields. The conjugation of the Pd/L2 system and the water addition protocol can efficiently catalyze a broad range of electron-rich, -neutral, -deficient, and sterically hindered aryl chlorides and heteroaryl chlorides with excellent yields within three hours and the catalyst loading can be down to 0.05 mol % Pd for the first time. Hiyama coupling of heteroaryl chlorides with heteroaryl silanes is also reported for the first time. The reaction can be easily scaled up 200 times (100 mmol) without any degasification and purification of reactants; this facilitates the practical application in routine synthesis.

  14. Recent advances in trifluoromethylation of organic compounds using Umemoto's reagents.

    Science.gov (United States)

    Zhang, Cai

    2014-09-14

    The incorporation of fluorine-containing moieties into organic compounds is of great importance in pharmaceutical, agricultural, and materials science. Within these organofluorides, the trifluoromethyl group is one of the most important motifs. In recent years, the trifluoromethyl group has attracted more and more attention, and many trifluoromethylated compounds have been found to possess special activities. However, until now, only a few methods have been developed to achieve this efficiently using Umemoto's reagents. This review highlights recent developments in the direct introduction of a trifluoromethyl group into organic compounds with Umemoto's reagents. Seven approaches to the trifluoromethylation of organic compounds are summarized: (i) trifluoromethylation of arenes, (ii) trifluoromethylation of alkenes, (iii) trifluoromethylation of terminal alkynes, (iv) deoxygenative trifluoromethylation of benzylic xanthates, (v) trifluoromethylation of ketoesters, (vi) trifluoromethylation of aryl boronic acids and aromatic amines (synthesis of ArCF3) and (vii) trifluoromethylation of biphenyl isocyanide derivatives.

  15. Effect of dioxins on regulation of tyrosine hydroxylase gene expression by aryl hydrocarbon receptor: a neurotoxicology study

    Directory of Open Access Journals (Sweden)

    Akahoshi Eiichi

    2009-06-01

    Full Text Available Abstract Background Dioxins and related compounds are suspected of causing neurological disruption. Epidemiological studies indicated that exposure to these compounds caused neurodevelopmental disturbances such as learning disability and attention deficit hyperactivity disorder, which are thought to be closely related to dopaminergic dysfunction. Although the molecular mechanism of their actions has not been fully investigated, a major participant in the process is aryl hydrocarbon receptor (AhR. This study focused on the effect of 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD exposure on the regulation of TH, a rate-limiting enzyme of dopamine synthesis, gene expression by AhR. Methods N2a-Rβ cells were established by transfecting murine neuroblastoma Neuro2a with the rat AhR cDNA. TH expression induced by TCDD was assessed by RT-PCR and Western blotting. Participation of AhR in TCDD-induced TH gene expression was confirmed by suppressing AhR expression using the siRNA method. Catecholamines including dopamine were measured by high-performance liquid chromatography. A reporter gene assay was used to identify regulatory motifs in the promoter region of TH gene. Binding of AhR with the regulatory motif was confirmed by an electrophoretic mobility shift assay (EMSA. Results Induction of TH by TCDD through AhR activation was detected at mRNA and protein levels. Induced TH protein was functional and its expression increased dopamine synthesis. The reporter gene assay and EMSA indicated that AhR directly regulated TH gene expression. Regulatory sequence called aryl hydrocarbon receptor responsive element III (AHRE-III was identified upstream of the TH gene from -285 bp to -167 bp. Under TCDD exposure, an AhR complex was bound to AHRE-III as well as the xenobiotic response element (XRE, though AHRE-III was not identical to XRE, the conventional AhR-binding motif. Conclusion Our results suggest TCDD directly regulate the dopamine system by TH gene

  16. Synthesis of a TREN in which the aryl substituents are part of a 45 atom macrocycle.

    Science.gov (United States)

    Cain, Matthew F; Forrest, William P; Peryshkov, Dmitry V; Schrock, Richard R; Müller, Peter

    2013-10-16

    A substituted TREN has been prepared in which the aryl groups in (ArylNHCH2CH2)3N are substituted at the 3- and 5-positions with a total of six OCH2(CH2)nCH═CH2 groups (n = 1, 2, 3). Molybdenum nitride complexes, [(ArylNCH2CH2)3N]Mo(N), have been isolated as adducts that contain B(C6F5)3 bound to the nitride. Two of these [(ArylNCH2CH2)3N]Mo(NB(C6F5)3) complexes (n = 1 and 3) were crystallographically characterized. After removal of the borane from [(ArylNCH2CH2)3N]Mo(NB(C6F5)3) with PMe3, ring-closing olefin metathesis (RCM) was employed to join the aryl rings with OCH2(CH2)nCH═CH(CH2)nCH2O links (n = 1-3) between them. RCM worked best with a W(O)(CHCMe3)(Me2Pyr)(OHMT)(PMe2Ph) catalyst (OHMT = hexamethylterphenoxide, Me2Pyr = 2,5-dimethylpyrrolide) and n = 3. The macrocyclic ligand was removed from the metal through hydrolysis and isolated in 70-75% yields relative to the borane adducts. Crystallographic characterization showed that the macrocyclic TREN ligand in which n = 3 contains three cis double bonds. Hydrogenation produced a TREN in which the three links are saturated, i.e., O(CH2)10O.

  17. Oculomotor deficits in aryl hydrocarbon receptor null mouse.

    Directory of Open Access Journals (Sweden)

    Aline Chevallier

    Full Text Available The Aryl hydrocarbon Receptor or AhR, a ligand-activated transcription factor, is known to mediate the toxic and carcinogenic effects of various environmental pollutants such as 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD. Recent studies in Caenorhabditis elegans and Drosophila melanogaster show that the orthologs of the AhR are expressed exclusively in certain types of neurons and are implicated in the development and the homeostasis of the central nervous system. While physiological roles of the AhR were demonstrated in the mammalian heart, liver and gametogenesis, its ontogenic expression and putative neural functions remain elusive. Here, we report that the constitutive absence of the AhR in adult mice (AhR-/- leads to abnormal eye movements in the form of a spontaneous pendular horizontal nystagmus. To determine if the nystagmus is of vestibular, visual, or cerebellar origin, gaze stabilizing reflexes, namely vestibulo-ocular and optokinetic reflexes (VOR and OKR, were investigated. The OKR is less effective in the AhR-/- mice suggesting a deficit in the visuo-motor circuitry, while the VOR is mildly affected. Furthermore, the AhR is expressed in the retinal ganglion cells during the development, however electroretinograms revealed no impairment of retinal cell function. The structure of the cerebellum of the AhR-/- mice is normal which is compatible with the preserved VOR adaptation, a plastic process dependent on cerebellar integrity. Finally, intoxication with TCDD of control adults did not lead to any abnormality of the oculomotor control. These results demonstrate that the absence of the AhR leads to acquired central nervous system deficits in the adults. Given the many common features between both AhR mouse and human infantile nystagmus syndromes, the AhR-/- mice might give insights into the developmental mechanisms which lead to congenital eye disorders.

  18. Enantiospecific effects of ketoconazole on aryl hydrocarbon receptor.

    Directory of Open Access Journals (Sweden)

    Aneta Novotna

    Full Text Available Azole antifungal ketoconazole (KET was demonstrated to activate aryl hydrocarbon receptor (AhR. Since clinically used KET is a racemic mixture of two cis-enantiomers (2R,4S-(+-KET and (2S,4R-(--KET, we examined the effects of KET enantiomers on AhR signaling pathway. (+-KET dose-dependently activated AhR in human gene reporter cell line AZ-AHR, and displayed 5-20× higher agonist activity (efficacy, as compared to (--KET; both enantiomers were AhR antagonists with equal potency (IC50. Consistently, (+-KET strongly induced CYP1A1 mRNA and protein in human HepG2 cells, while (--KET exerted less than 10% of (+-KET activity. In primary human hepatocytes, both enantiomers preferentially induced CYP1A2 over CYP1A1 mRNA and protein, and the potency of (+-KET was slightly higher as compared to (--KET. Ligand binding assay with guinea pig liver cytosols revealed that both (+-KET and (--KET are weak ligands of AhR that displaced [3H]-TCDD with comparable potency. Similarly, both enantiomers weakly transformed AhR to DNA-binding form with similar potency, as showed by EMSA, in guinea pig liver cytosolic extracts and nuclear extracts from mouse Hepa-1 cells. We also examined effects of KET on glucocorticoid receptor (GR, a regulator of AhR activity. Both KET enantiomers antagonized GR with similar potency, as revealed by gene reporter assay in AZ-GR cell line and down-regulation of tyrosine aminotransferase mRNA in human hepatocytes. Finally, we demonstrate enantiospecific antifungal activities of KET enantiomers in six Candida spp. strains. In conclusion, the significance of current study is providing the first evidence of enatiospecific effects of cis-enantiomers of ketoconazole on AhR-CYP1A pathway.

  19. Nature of phenolic compounds in coffee melanoidins.

    Science.gov (United States)

    Coelho, Carina; Ribeiro, Miguel; Cruz, Ana C S; Domingues, M Rosário M; Coimbra, Manuel A; Bunzel, Mirko; Nunes, Fernando M

    2014-08-06

    Phenolic compounds are incorporated into coffee melanoidins during roasting mainly in condensed form (42-62 mmol/100 g) and also in ester-linked form (1.1-1.6 mmol/100 g), with incorporation levels depending on the green coffee chlorogenic acid content. The phenolic compounds are incorporated in different coffee melanoidin populations, but mainly in those soluble in 75% ethanol (82%), a significant correlation between the amount of phenolic compounds and the amount of protein and color characteristics of the different melanoidin populations being observed. The incorporation of phenolic compounds into coffee melanoidins is a significant pathway of chlorogenic acid degradation during roasting, representing 23% of the chlorogenic acids lost. These account for the nearly 26% of the material not accounted for by polysaccharides and proteins present in coffee melanodins. The cleavage mechanism and the efficiency of alkaline fusion used to release condensed phenolics from coffee melanoidins suggest that the phenolic compounds can be linked to the polymeric material by aryl-ether, stilbene type, and/or biphenyl linkages.

  20. CuI/Proline-catalyzed N-Arylation of Nitrogen Heterocycles

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Ma's CuI/proline procedure for the catalytic cross coupling between nitrogen heterocycles and aryl halides was markedly improved. The key finding was that K3PO4 was a much better base than K2CO3 for the reaction. With this new reaction condition the cross coupling with aryl iodides could be accomplished in 1,4-dioxane instead of DMSO. This reactin also could be carried out in DMF. Furthermore, the coupling yields under the new conditions are usually higher than in Ma's original methods.

  1. Amination Reactions of Aryl Halides with Nitrogen-Containing Reagents Catalyzed by Cul in Ionic Liquid

    Institute of Scientific and Technical Information of China (English)

    YAN,Jin-Can; ZHOU,Li; WANG,Lei

    2008-01-01

    CuI-catalyzed coupling reactions of aryl iodides and electron-deficient aryl bromides with nitrogen-containing reagents, such as imidazole, benzimidazole, aliphatic primary and secondary amines, aniline, primary and secondary amides, in ionic liquid were developed. The reaction conditions involved the use of[Bmim][BF4] as the solvent,potassium phosphate as the base, and CuI as the catalyst. The CuI and[Bmim][BF4] could be recovered and recycled for five consecutive trials without significant loss of their activity.

  2. Asymmetric synthesis of quaternary aryl amino acid derivatives via a three-component aryne coupling reaction

    Directory of Open Access Journals (Sweden)

    Elizabeth P. Jones

    2011-11-01

    Full Text Available A method was developed for the synthesis of α-alkyl, α-aryl-bislactim ethers in good to excellent yields and high diastereoselectivities, consisting of a facile one-pot procedure in which the aryl group is introduced by means of a nucleophilic addition to benzyne and the alkyl group by alkylation of a resultant benzylic anion. Hydrolysis of the sterically less hindered adducts gave the corresponding quaternary amino acids with no racemization, whereas hydrolytic ring opening gave the corresponding valine dipeptides from bulkier bislactims.

  3. O-methylation of natural phenolic compounds based on green chemistry using dimethyl carbonate

    Science.gov (United States)

    Prakoso, N. I.; Pangestu, P. H.; Wahyuningsih, T. D.

    2016-02-01

    The alkyl aryl ether compounds, of which methyl eugenol and veratraldehyde are the simplest intermediates can be synthesized by reacting eugenol and vanillin with the green reagent dimethyl carbonate (DMC). The reaction was carried out under mild of temperature and pressure. Excellent yields and selective products were obtained (95-96%) after a few hours. In the end of the reaction, the catalysts (base and Phase Transfer Catalyst) can be recovered and regenerated.

  4. An LFER study of the protolytic equilibria of 4-aryl-2,4-dioxobutanoic acids in aqueous solutions

    Directory of Open Access Journals (Sweden)

    TATJANA Z. VERBIC

    2007-12-01

    Full Text Available The protolytic equilibria of 13 4-aryl-2,4-dioxobutanoic acids (ADKs were spectrophotometrically studied in aqueous solutions in the pH range 1–9 at 25±1 °C and an ionic strength of 0.1 mol l-1 (NaCl, with the exception of the 4-OH- derivative which was also potentiometrically studied in the pH range 7–10 at 25±1 °C and an ionic strength of 0.1 mol l-1 (NaCl. In solution, the compounds simultaneously exist in one diketo and two enolic forms; therefore, the determined acidity constants (pKa1 1.87–2.29, pKa2 6.63–8.13 and pKa3(4-OH- 9.52 represent system macro constants. The 1H-NMR spectrum of the basic compound (4-phenyl-2,4-dioxobutanoic acid (25 °C, pD 5.0 proved the existence of all tautomeric forms. Using the extended Hammett relation, the determined pKa values were correlated with literature σ values. The predicted pKa values were in fair accordance with the experimentally observed ones. Molecular, monoanionic and dianionic forms of the basic compound were optimized by the semi-empirical molecular orbital PM6 method using the implicit water solvation model (COSMO. The obtained geometries were used to explain the quality of the LFER models.

  5. Polybenzimidazole compounds

    Science.gov (United States)

    Klaehn, John R.; Peterson, Eric S.; Wertsching, Alan K.; Orme, Christopher J.; Luther, Thomas A.; Jones, Michael G.

    2010-08-10

    A PBI compound that includes imidazole nitrogens, at least a portion of which are substituted with an organic-inorganic hybrid moiety. At least 85% of the imidazole nitrogens may be substituted. The organic-inorganic hybrid moiety may be an organosilane moiety, for example, (R)Me.sub.2SiCH.sub.2--, where R is selected from among methyl, phenyl, vinyl, and allyl. The PBI compound may exhibit similar thermal properties in comparison to the unsubstituted PBI. The PBI compound may exhibit a solubility in an organic solvent greater than the solubility of the unsubstituted PBI. The PBI compound may be included in separatory media. A substituted PBI synthesis method may include providing a parent PBI in a less than 5 wt % solvent solution. Substituting may occur at about room temperature and/or at about atmospheric pressure. Substituting may use at least five equivalents in relation to the imidazole nitrogens to be substituted or, preferably, about fifteen equivalents.

  6. ANTIMICROBIAL ACTIVITY OF DIFFERENT THIOSEMICARBAZONE COMPOUNDS AGAINST MICROBIAL PATHOGENS

    Directory of Open Access Journals (Sweden)

    Negi Parul

    2012-05-01

    Full Text Available Thiosemicarbazone belongs to a large group of thiourea derivatives, whose biological activities are a function of parent aldehyde or ketone moiety. They have been evaluated over the last 50 year as antiviral, antibacterial, antifungal, antimalarial, anticancer, leprosy, rheumatism, trypanosomiasis and coccidiodis. Thiosemicarbazones were prepared by simple process in which N4-thiosemicarbazone moiety was replaced by aliphatic, arylic and cyclic amines. Present study reported the anti-microbial activity of different thiosemicarbazone compounds against certain bacterial and fungal pathogens viz. Bacillus cereus, Staphylococcus epidermis, Moraxella cattarhalis, Staph. Saprophyticus, Candida albicans and Aspergillus flavans.

  7. Synthesis and electrochemical properties of 2,6-bis(6-aryl-[1,2,4]-triazolo[3,4-b] [1,3,4]-thiadiazole-3-yl)pyridines

    Institute of Scientific and Technical Information of China (English)

    Chun Xia Tan; Ruo Fei Feng; Xiao Xia Peng

    2007-01-01

    By the condensation of 2,6-bis(4-amino-5-mercapto-[1,2,4]-triazoles-2)pyridine with aromatic acid in the presence of phosphorus oxychloride. Compounds of 2,6-bis(6-aryl-[1,2,4]-triazolo[3,4-b][1,3,4]-thiadiazole-3-yl)pyridines were synthesized.Their structures were confirmed by IR, 1H NMR spectroscopies and elemental analysis. Their electrochemical behavior and cyclic voltammogram also were be studied. The results showed that they have high ionization potentials and good affinity.

  8. Mechanistic investigation into cross-linking reactions in low rank coal: formation and pyrolysis of aryl esters

    Energy Technology Data Exchange (ETDEWEB)

    Britt, P.F.; Buchanan, A.C. III; Kiddern, M.K.; Skeen, J.D. [Oak Ridge National Lab. Oak Ridge, TN (USA). Chemical Sciences Division

    2003-07-01

    In this study, the sealed tube pyrolysis of mixtures of m-phenylphenol and benzoic acid have been investigated at 400{sup o}C to determine if cross-linking reactions can occur, and to determine the low temperature pyrolysis pathways of aryl esters, which are not known. Initial studies show that condensation reactions occur between carboxylic acids and phenols to form aryl esters at temperatures as low as 200{sup o}C. With a 3:1 ratio of m-phenylphenol to benzoic acid, yields of m-phenylphenyl benzoate were as high as 50% at 400{sup o}C. At short reaction times, the dominant products were the aryl ester and benzene, formed by the acid catalyzed decarboxylation of benzoic acid, but at longer times, other arylated products grew in indicating that radical reactions were occurring. These products appear to arise from the induced decomposition of benzoic anhydride to form phenyl radicals. The thermal stability of aryl esters was investigated through the pyrolysis of phenyl benzoate at 400{sup o}C. As predicted, the aryl ester appeared to be thermally stable but hydrolytically unstable. In general, formation of aryl esters could act as a low temperature cross-link in low rank coals. 19 refs., 3 figs., 1 tab.

  9. Aryl hydrocarbon receptor mediates benzene-induced hematotoxicity.

    Science.gov (United States)

    Yoon, Byung-Il; Hirabayashi, Yoko; Kawasaki, Yasushi; Kodama, Yukio; Kaneko, Toyozo; Kanno, Jun; Kim, Dae-Yong; Fujii-Kuriyama, Yoshiaki; Inoue, Tohru

    2002-11-01

    Benzene can induce hematotoxicity and leukemia in humans and mice. Since a review of the literature shows that the CYP2E1 knockout mouse is not known to possess any benzene toxicity, the metabolism of benzene by CYP2E1 in the liver is regarded to be prerequisite for its cytotoxicity and genotoxicity, although the mechanism is not fully understood yet. Because it was found some years ago that benzene was also a substrate for CYP1A1, we investigated the involvement of the aryl hydrocarbon receptor (AhR) in benzene hematotoxicity using AhR wild-type (AhR(+/+)), heterozygous (AhR(+/-)), and homozygous (AhR(-/-)) male mice. Interestingly, following a 2-week inhalation of 300 ppm benzene (a potent dose for leukemogenicity), no hematotoxicity was induced in AhR(-/-) mice. Further, there were no changes in cellularity of peripheral blood and bone marrow (BM), nor in levels of granulocyte-macrophage colony-forming units in BM. This lack of hematotoxicity was associated with the lack of p21 overexpression, which was regularly seen in the wild-type mice following benzene inhalation. Combined treatment with two major benzene metabolites, phenol and hydroquinone, induced hemopoietic toxicity, although it was not known whether this happened due to a surprising lack of expression of CYP2E1 by AhR knockout, or due to a lack of other AhR-mediated CYP enzymes, including 1A1 (i.e., a possible alternative pathway of benzene metabolism). The former possibility, evaluated in the present study, failed to show a significant relationship between AhR and the expression of CYP2E1. Furthermore, a subsequent evaluation of AhR expression after benzene inhalation tended to show higher but less significant expression in the liver, and none in the BM, compared with sham control. Although this study failed to identify the more likely of the above-mentioned two possibilities, the study using AhR knockout mice on benzene inhalation presents the unique possibility that the benzene toxicity may be

  10. Synthesis and structure-activity relationships of N-aryl-piperidine derivatives as potent (partial) agonists for human histamine H3 receptor.

    Science.gov (United States)

    Ishikawa, Makoto; Furuuchi, Takeshi; Yamauchi, Miki; Yokoyama, Fumikazu; Kakui, Nobukazu; Sato, Yasuo

    2010-07-15

    4-((1H-imidazol-4-yl)methyl)-1-aryl-piperazine and piperidine derivatives were designed and synthesized as candidate human histamine type 3 agonists. The piperazine derivatives were found to have low (or no) affinity for human histamine H3 receptor, whereas the piperidine derivatives showed moderate to high affinity, and their agonistic activity was greatly influenced by substituents on the aromatic ring. Among the piperidine-containing compounds, 17d and 17h were potent human histamine H3 receptor agonists with high selectivity over the closely related human H4 receptor. Our results indicate that appropriate conformational restriction, that is, by the piperidine spacer moiety, favors specific binding to the human histamine H3 receptor.

  11. Synthesis of 4-aryl-4,5-dihydro-1-indeno[1,2-]pyrimidines by Biginelli condensation and their antibacterial activities

    Indian Academy of Sciences (India)

    Ramandeep Kaur; Monika Bansal; Balbir Kaur; Tulika Mishra; Aruna Bhatia

    2011-07-01

    A simple and efficient method has been developed for the synthesis of series of 4-aryl-1,3,4,5-tetrahydro-2-indeno[1,2-]pyrimidine-2-thiones through Biginelli’s one-pot multicomponent condensation reaction via microwave irradiations. Then, these thiones were converted to their S-alkylated/aralkylated derivatives. The prepared heterocyclic products were structurally confirmed by analytical and spectral data and evaluated for their antibacterial activities. The results showed that this skeletal framework exhibited marked potency as antibacterial agents. The compound 2-(Ethylthio)-4-(4-Hydroxy-3-methoxyphenyl)-4,5-dihydro-1-indeno[1,2-]pyrimidines 4b have shown antibacterial activity towards all the seven clinical isolates used.

  12. Palladium-Catalyzed Directed C(sp(3))-H Arylation of Saturated Heterocycles at C-3 Using a Concise Optimization Approach.

    Science.gov (United States)

    Affron, Dominic P; Bull, James A

    2016-01-01

    Saturated heterocycles, such as THFs, pyrrolidines, piperidines and THPs, are essential components of many biologically active compounds. Examples of C-H functionalization on these important ring systems remain scarce, especially at unactivated positions. Here we report the development of conditions for the palladium-catalyzed stereoselective C(sp(3))-H arylation at unactivated 3-positions of 5- and 6-membered N- and O-heterocycles with aminoquinoline directing groups. Subtle differences in substrate structures altered their reactivity significantly; and different conditions were required to achieve high yields in each case. Successful conditions were developed using a short empirical optimization approach to cover reaction space with a limited set of variables. Excellent cis-selectivity was achieved in all cases, except for the THP substrate where minor trans-products were formed through a different palladacyclic intermediate. Here, differences in reactivity and selectivity with other directing groups were examined.

  13. Discovery of Aryl Sulfonamides as Isoform-Selective Inhibitors of NaV1.7 with Efficacy in Rodent Pain Models.

    Science.gov (United States)

    Focken, Thilo; Liu, Shifeng; Chahal, Navjot; Dauphinais, Maxim; Grimwood, Michael E; Chowdhury, Sultan; Hemeon, Ivan; Bichler, Paul; Bogucki, David; Waldbrook, Matthew; Bankar, Girish; Sojo, Luis E; Young, Clint; Lin, Sophia; Shuart, Noah; Kwan, Rainbow; Pang, Jodie; Chang, Jae H; Safina, Brian S; Sutherlin, Daniel P; Johnson, J P; Dehnhardt, Christoph M; Mansour, Tarek S; Oballa, Renata M; Cohen, Charles J; Robinette, C Lee

    2016-03-10

    We report on a novel series of aryl sulfonamides that act as nanomolar potent, isoform-selective inhibitors of the human sodium channel hNaV1.7. The optimization of these inhibitors is described. We aimed to improve potency against hNaV1.7 while minimizing off-target safety concerns and generated compound 3. This agent displayed significant analgesic effects in rodent models of acute and inflammatory pain and demonstrated that binding to the voltage sensor domain 4 site of NaV1.7 leads to an analgesic effect in vivo. Our findings corroborate the importance of hNaV1.7 as a drug target for the treatment of pain.

  14. EFFECT OF FINAL HEATING TEMPERATURE ON CRYSTALLIZATION OF ISOTACTIC POLYPROPYLENE NUCLEATED WITH AN ARYL AMIDE DERIVATIVE AS β-FORM NUCLEATING AGENT

    Institute of Scientific and Technical Information of China (English)

    Mu Dong; Ming-yin Jia; Zhao-xia Guo; Jian Yu

    2011-01-01

    An aryl dicarboxylic acid amide compound TMB-5 is an efficient β-form nucleating agent for isotactic polypropylene (iPP). Because of the solubility of TMB-5, superstructure and morphology of iPP crystals changed with melting conditions. Effects of final heating temperature (Tf) on heterogeneous nucleation of iPP/TMB-5 were investigated. It was discovered that the crystallization temperature increased with decreasing Tf value. The optical microscopic images indicated that when TMB-5 partially dissolved in iPP melt, the remaining (non-dissolved) TMB-5 facilitated the recrystallization of dissolved nucleating agent from the melt, which promoted crystallization. Complete solubility of nucleating agent caused the decreasing efficiency. TMB-5 recrystallized in the form of tiny needles, whose aggregates induced dendritic iPP crystals.

  15. Synthesis and Fungicidal Activity of 5-Aryl-1-(aryloxyacetyl)-3-(tert-butyl or phenyl)-4-(1H-1,2,4-triazol-1-yl)-4,5-Dihydropyrazole

    Institute of Scientific and Technical Information of China (English)

    毛会玉; Hong; SONG; SHI; Deqing

    2014-01-01

    A series of novel 5-aryl-1-(aryloxyacetyl)-3-(tert-butyl or phenyl)-4-(1H-1,2,4-triazol-1-yl)-4,5-dihydropyrazole 3a-3n were synthesized by the annulation of 2-aryloxyacetohydrazides with 3-aryl-1-t-butyl(or phenyl)-2-(1H-1,2,4-triazol-1-yl)prop-2-en-1-ones(1)in the presence of a catalytic amount of acetic acid.Compounds 2 were obtained by the Knoevenagel reactions of 1-t-butyl(or phenyl)-2-(1H-1,2,4-triazol-1-yl)ethanone(2)with aromatic aldehydes in the presence of piperidine.Their structures were confirmed by IR,1H-NMR,ESIMS,and elemental analyses.The preliminary bioassay indicated that some compounds displayed moderate to excellent fungicidal activity.For example,compounds 31,3m,and 3n possessed100%inhibition against Cercospora arachidicola Hori at the concentration of 50 mg/L.

  16. Smoke carcinogens cause bone loss through the aryl hydrocarbon receptor and induction of CYP1 enzymes

    Science.gov (United States)

    Smoking is a major risk factor for osteoporosis and fracture. Here, we show that smoke toxins and environmental chemicals such as benzo[a]pyrene (BaP), 2,3,7,8-tetrachlorodibenzo-pdioxin (TCDD), and 3-methyl cholanthrene, which are well known aryl hydrocarbon receptor (AHR) agonists, induce osteocla...

  17. Synthesis of a Crushed Fullerene C60H24 through Sixfold Palladium-Catalyzed Arylation.

    Science.gov (United States)

    Dorel, Ruth; de Mendoza, Paula; Calleja, Pilar; Pascual, Sergio; González-Cantalapiedra, Esther; Cabello, Noemí; Echavarren, Antonio M

    2016-07-01

    The synthesis of a new C3v -symmetric crushed fullerene C60H24 (5) has been accomplished in three steps from truxene through sixfold palladium-catalyzed intramolecular arylation of a syn-trialkylated truxene precursor. Laser irradiation of 5 induces cyclodehydrogenation processes that result in the formation of C60, as detected by LDI-MS.

  18. Synthesis of a Crushed Fullerene C60H24 through Sixfold Palladium‐Catalyzed Arylation

    Science.gov (United States)

    Dorel, Ruth; de Mendoza, Paula; Calleja, Pilar; Pascual, Sergio; González‐Cantalapiedra, Esther; Cabello, Noemí

    2016-01-01

    The synthesis of a new C 3v‐symmetric crushed fullerene C60H24 (5) has been accomplished in three steps from truxene through sixfold palladium‐catalyzed intramolecular arylation of a syn‐trialkylated truxene precursor. Laser irradiation of 5 induces cyclodehydrogenation processes that result in the formation of C60, as detected by LDI‐MS. PMID:27774038

  19. N-Unsubstituted and N-Arylated Fulleropyrrolidines: New Useful Building Blocks for C60 Functionalization

    Institute of Scientific and Technical Information of China (English)

    TONG,Chen-Hua; WU,Zong-Quan; HOU,Jun-Li; LI,Zhan-Ting

    2006-01-01

    Two series of stable and soluble fulleropyrrolidines have been prepared from the reactions of C60, glycine or its N-arylated derivatives and aliphatic aldehydes or ketones in refluxing toluene or chlorobenzene. The new C60 derivatives represent new useful building blocks for further preparation of more funcionalized C60 derivatives.

  20. Restricted utility of aryl isoprenoids as indicators of photic zone anoxia

    NARCIS (Netherlands)

    Sinninghe Damsté, J.S.; Koopmans, M.P.; Schouten, S.; Kohnen, M.E.L.

    1996-01-01

    In a North Sea oil, the carotenoid derivatives -carotene, -isorenieratane, and isorenieratane were identified, together with a series of aryl isoprenoids with a 2,3,6-trimethyl substitution pattern for the aromatic ring. The 13C values of -carotene and -isorenieratane are similar, whereas isoreniera

  1. A General and Efficient CuBr2-Catalyzed N-Arylation of Secondary Acyclic Amides

    Institute of Scientific and Technical Information of China (English)

    王满刚; 于华; 尤心稳; 吴军; 商志才

    2012-01-01

    A general and efficient Cu(II)-catalyzed cross-coupling method is reported for the preparation of acyclic tertiary amides. Generally moderate to excellent yields and functional group tolerance were obtained with secondary acyclic amides and aryl halides as substrates in toluene.

  2. Arylation of Acrylamide and Acrylonitrile with Arenediazonium Salts Catalyzed by Palladium Acetate

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Arylation of acrylamide and acrylonitrile were carried out with various arenediazonium tetrafluoroborates in the presence of a catalytic amount of Pd(OAc)2 in ethanol and a variety of substituted (E)-cinnamamides and (E)-cinnamonitriles were obtained in high yields under mild reaction conditions.

  3. Dynamic Rheological Characterization of A Thermotropic Liquid Crystalline Poly (aryl ether ketone)

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The rheometrics ARES rheometer was applied to determining the rheological behavior of a thermotropic liquid crystalline poly (aryl ether ketone). The viscosity of the material decreases with increasing temperature, reaching a minimum in the nematic state, then slightly increases with further raising the temperature in the biphase.

  4. Spectral and catalytic properties of aryl-alcohol oxidase, a fungal flavoenzyme acting on polyunsaturated alcohols

    NARCIS (Netherlands)

    Ferreira, P.; Medina, M.; Guillén, F.; Martínez, M.J.; Berkel, van W.J.H.; Martínez, A.T.

    2005-01-01

    Spectral and catalytic properties of the flavoenzyme AAO (aryl-alcohol oxidase) from Pleurotus eryngii were investigated using recombinant enzyme. Unlike most flavoprotein oxidases, AAO does not thermodynamically stabilize a flavin semiquinone radical and forms no sulphite adduct. AAO catalyses the

  5. An Efficient Synthesis of Cyclopeptides Bridged with Aliphafic-aryl Ether Bond

    Institute of Scientific and Technical Information of China (English)

    Zhe LIU; Gui Jei TIAN; De Xin WANG

    2005-01-01

    Based on the pseudo-dilution effect (PDE) on solid support, three cyclopeptides with an aliphatic-aryl ether bond as the bridge were synthesized via SN2 reaction between bromoacetylated at N-terminal and the phenol -OH group in C-terminal Tyr residue. All the products were obtained in good overall yields and characterized by related analytic data.

  6. A nordehydroabietyl amide-containing chiral diene for rhodium-catalysed asymmetric arylation to nitroolefins.

    Science.gov (United States)

    Li, Ruikun; Wen, Zhongqing; Wu, Na

    2016-11-29

    A highly enantioselective rhodium catalysed asymmetric arylation (RCAA) of nitroolefins with arylboronic acids is presented using a newly developed, C1-symmetric, non-covalent interacted, phellandrene derived, nordehydroabietyl amide-containing chiral diene under mild conditions. Stereoelectronic effects were studied, suggesting an activation of the bound substrate through the secondary amide as a hydrogen-bond donor.

  7. Aryl hydrocarbon receptor ligand effects in RBL2H3 cells

    DEFF Research Database (Denmark)

    Maaetoft-Udsen, Kristina; Shimoda, Lori M. N.; Frøkiær, Hanne;

    2012-01-01

    The aryl hydrocarbon receptor (AHR) mediates toxic effects of dioxin and xenobiotic metabolism. AHR has an emerging role in the immune system, but its physiological ligands and functional role in immunocytes remain poorly understood. Mast cells are immunocytes that are central to inflammatory...

  8. Brønsted acid-surfactant (BAS catalysed cyclotrimerization of aryl methyl ketone

    Directory of Open Access Journals (Sweden)

    Kiran Phatangare

    2012-07-01

    Full Text Available A brønsted acid-surfactant catalysed and simple, mild, metal catalyst free and chemo-selective method has been developed for synthesis of 1, 3, 5-triaryl benzenes from aryl methyl ketones. The advantages of this protocol subsume green and sustainable reaction medium, mild reaction conditions, easy product recovery and its good yields.

  9. Palladium-catalyzed Coupling between Aryl Halides and Trimethylsilylacetylene Assisted by Dimethylaminotrimethyltin

    Institute of Scientific and Technical Information of China (English)

    Cai Liangzhen; Yang Dujuan; Sun Zhonghua; Tao Xiaochun; Cai Lisheng; Pike Victor W

    2011-01-01

    Palladium-catalyzed coupling between aryl halides, especially less reactive ones or N-heteroaryls, and trimethylsilylacetylene in the presence of dimethylaminotrimethyltin generated the coupled products in high yields. The reaction does not need CuI and base as auxiliary agents.

  10. Dioxin increases the interaction between aryl hydrocarbon receptor and estrogen receptor alpha at human promoters

    DEFF Research Database (Denmark)

    Ahmed, Shaaima; Valen, Eivind; Sandelin, Albin Gustav;

    2009-01-01

    Recent studies have shown that activated aryl hydrocarbon receptor (AHR) induced the recruitment of estrogen receptor- (ER ) to AHR-regulated genes and that AHR is recruited to ER -regulated genes. However, these findings were limited to a small number of well-characterized AHR- or ER -responsive...

  11. Trapping Reactive Intermediates by Mechanochemistry: Elusive Aryl N-Thiocarbamoylbenzotriazoles as Bench-Stable Reagents.

    Science.gov (United States)

    Štrukil, Vjekoslav; Gracin, Davor; Magdysyuk, Oxana V; Dinnebier, Robert E; Friščić, Tomislav

    2015-07-13

    Monitoring of mechanochemical thiocarbamoylation by in situ Raman spectroscopy revealed the formation of aryl N-thiocarbamoylbenzotriazoles, reactive intermediates deemed unisolable in solution. The first-time isolation and structural characterization of these elusive molecules demonstrates the ability of mechanochemistry to access otherwise unobtainable intermediates and offers a new range of masked isothiocyanate reagents.

  12. Direct synthesis of diaryl sulfides by copper-catalyzed coupling of aryl halides with aminothiourea

    Institute of Scientific and Technical Information of China (English)

    Xiang Mei Wu; Wei Ya Hu

    2012-01-01

    An efficient and simple protocol of copper-catalyzed C-S bond formation between aryl halides and inexpensive and commercially available aminothiourea is reported.A variety of symmetrical diaryl sulfides can be synthesized in good to excellent yields up to 94% with the advantage of avoiding foul-smelling thiols.

  13. Suzuki-Miyaura cross-coupling of potassium dioxolanylethyltrifluoroborate and aryl/heteroaryl chlorides.

    Science.gov (United States)

    Fleury-Brégeot, Nicolas; Oehlrich, Daniel; Rombouts, Frederik; Molander, Gary A

    2013-04-01

    A robust and efficient protocol for the introduction of the dioxolanylethyl moiety onto various aryl and heteroaryl halides has been developed, providing cross-coupling yields up to 93%. Copper-catalyzed borylation of 2-(2-bromoethyl)-1,3-dioxolane with bis(pinacolato)diboron followed by treatment with potassium bifluoride provides the key organotrifluoroborate reagent.

  14. Palladium-catalyzed Substitution of Ketone or Aldehyde Bearing Aryl Triflates by Amines or Amides

    Institute of Scientific and Technical Information of China (English)

    TAO Xiaochun; DAI Chunya; CAO Xiongjie; CAI Lisheng; PIKE Victor W

    2009-01-01

    Various aryl triflates, bearing ketone or aldehyde groups, were evaluated for palladium-mediated introduction of an amino group at the triflate position in the presence of various phosphine ligands. BINAP was best for secondary amines, MOP-type ligand for primary or small secondary amines and Xantphos for primary or cyclic secondary amides. No ligand was found effective for acyclic secondary amides.

  15. Inhibition of mucin glycosylation by aryl-N-acetyl-alpha-galactosaminides in human colon cancer cells

    Energy Technology Data Exchange (ETDEWEB)

    Kuan, S.F.; Byrd, J.C.; Basbaum, C.; Kim, Y.S. (Veterans Administration Medical Center, San Francisco, CA (USA))

    1989-11-15

    Specific inhibitors of the glycosylation of O-glycosidically linked glycoproteins have not previously been described. When tested for their effects on mucin glycosylation in a mucin-producing colon cancer cell line, LS174T, benzyl-, phenyl-, and p-nitrophenyl-N-acetyl-alpha-galactosaminide inhibited the formation of fully glycosylated mucin in a dose-dependent manner. Free aryl-oligosaccharides were found in the medium of treated cells labeled with ({sup 3}H)glucosamine, ({sup 3}H)galactose, ({sup 3}H)fucose, ({sup 3}H)mannosamine, or phenyl-alpha-(6-{sup 3}H) N-acetylgalactosamine. UDP-Gal:GalNAc-beta 1,3-galactosyltransferase was inhibited by aryl-N-acetyl-alpha-galactosaminides but not by a number of other aryl-glycosides. Treatment with these inhibitors also causes reversible morphologic changes including formation of intercellular cysts. Aryl-N-acetyl-alpha-galactosaminides can be useful for the structural and functional studies of mucin macromolecules and other O-linked glycoproteins.

  16. Mild Pd-catalyzed aminocarbonylation of (hetero)aryl bromides with a palladacycle precatalyst.

    Science.gov (United States)

    Friis, Stig D; Skrydstrup, Troels; Buchwald, Stephen L

    2014-08-15

    A palladacyclic precatalyst is employed to cleanly generate a highly active XantPhos-ligated Pd-catalyst. Its use in low temperature aminocarbonylations of (hetero)aryl bromides provides access to a range of challenging products in good to excellent yields with low catalyst loading and only a slight excess of CO. Some products are unattainable by traditional carbonylative coupling.

  17. Rhodium-catalysed arylative annulation of 1,4-enynes with arylboronic acids.

    Science.gov (United States)

    Matsuda, Takanori; Watanuki, Shoichi

    2015-01-21

    The rhodium(I)-catalysed arylative annulation of 1,4-enynes with arylboronic acids was investigated. The reaction was found to proceed via an addition-1,4-rhodium migration-addition sequence, affording the corresponding 1,1-disubstituted 3-(arylmethylene)indanes.

  18. LDA-Mediated Synthesis of Triarylmethanes by Arylation of Diarylmethanes with Fluoroarenes at Room Temperature.

    Science.gov (United States)

    Ji, Xinfei; Huang, Tao; Wu, Wei; Liang, Fang; Cao, Song

    2015-10-16

    A practical and convenient approach for the secondary C(sp(3))-H arylation of diarylmethanes with various fluoroarenes is described. The reaction proceeds smoothly in the presence of LDA (lithium diisopropylamide) at room temperature and affords triarylmethanes in moderate to high yields.

  19. An effective synthesis of β-aryl substituted isotetronic acids via Suzuki coupling

    Institute of Scientific and Technical Information of China (English)

    Huan Sheng Chen; Xia Ping Ma; Zhi Ming Li; Quan Rui Wang; Feng Gang Tao

    2008-01-01

    lsotetronic acids are of great agricultural and pharmacological relevance and occur in a number of natural products.A convenient synthetic pathway to β-aryl substituted isotetronic acid derivatives was developed via Suzuki cross-coupling of the corresponding β-bromo substituted isotetronic acid derivatives with arylboronic acids under palladium acetate catalysis.Good to excellent yields have been achieved.

  20. Vibrational energy relaxation of liquid aryl-halides X-C6H5 (X = F, Cl, Br, I).

    Science.gov (United States)

    Pein, Brandt C; Seong, Nak-Hyun; Dlott, Dana D

    2010-10-07

    Anti-Stokes Raman spectroscopy was used to probe vibrational energy dynamics in liquid ambient-temperature aryl-halides, X-Ph (X = F, Cl, Br, I; -Ph = C(6)H(5)), following IR excitation of a 3068 cm(-1) CH-stretching transition. Five ring vibrations and two substituent-dependent vibrations were monitored in each aryl-halide. Overall, the vibrational relaxation (VR) lifetimes in aryl-halides were shorter than those in normal benzene (H-Ph). The aryl-halide CH-stretch lifetimes increased in the order F, Cl, Br, I, ranging from 2.5 to 3.4 ps, compared with 6.2 ps in H-Ph. The aryl-halide energy transfer processes were similar overall with four exceptions. Three of the four exceptions could be explained as a result of faster VR of midrange vibrations (1000-1600 cm(-1)) in the heavier aryl-halides. The fourth appeared to result from a coincidental resonance in chlorobenzene that does not occur in the other aryl-halides. Among the aryl-halides, the decay of CH-stretching excitations (∼3070 cm(-1)) was slower in the heavier species, but the decay of midrange vibrations was faster in the heavier species. This seeming contradiction could be explained if VR depended primarily on the density of states (DOS) of the lower tiers of vibrational excitations. The DOS for the first few (1-4) tiers is similar for all aryl-halides in the CH-stretch region, but DOS increases with increasing halide mass in the midrange region.

  1. Cooperative Magnetism in Crystalline N-Aryl-substituted Verdazyl Radicals: First-Principles Predictions and Experimental Results.

    Science.gov (United States)

    Eusterwiemann, Steffen; Dresselhaus, Thomas; Doerenkamp, Carsten; Janka, Oliver; Niehaus, Oliver; Massolle, Anja; Daniliuc, Constantin; Eckert, Hellmut; Pöttgen, Rainer; Neugebauer, Johannes; Studer, Armido

    2017-03-20

    We report on a series of eight diaryl-6-oxo-verdazyl radicals containing a tert-butyl group at the C(3) position regarding their crystal structure and magnetic properties by means of magnetic susceptibility measurements in combination with quantum chemical calculations using the first-principles bottom-up approach. The latter method allows for a qualitative prediction and detailed analysis of the correlation between solid state architecture and magnetic properties. Although the perturbation in the molecular structure by varying the substituent of the N-aryl-ring may appear small, the effects upon the structural parameters controlling intermolecular magnetic coupling interactions are strong, resulting in a wide spectrum of cooperative magnetic behavior. The non-substituted 1,5-diphenyl-3-t.butyl-6-oxo-verdazyl radical features a ferromagnetic one-dimensional spin ladder type magnetic network, an extremely rarely observed phenomenon for verdazyl radicals. By varying substituents at the phenyl group, different non-isostructural compounds were obtained with widely different magnetic motifs ranging from linear and zig-zag one-dimensional chains to potentially two-dimensional networks, from which we predict magnetic susceptibility data that are in qualitative agreement with experiments and reveal a large sensitivity to molecular packing effects. The present study advances the fundamental understanding between solid state structure and magnetism in organically based radical systems.

  2. Improvement of Chicken Primordial Germ Cell Maintenance In Vitro by Blockade of the Aryl Hydrocarbon Receptor Endogenous Activity.

    Science.gov (United States)

    Pérez Sáez, Juan M; Bussmann, Leonardo E; Barañao, J Lino; Bussmann, Ursula A

    2016-06-01

    Primordial germ cells (PGCs) are the undifferentiated progenitors of gametes. Germline competent PGCs can be developed as a cell-based system for genetic modification in chickens, which provides a valuable tool for transgenic technology with both research and industrial applications. This implies manipulation of PGCs, which, in recent years, encouraged a lot of research focused on the study of PGCs and the way of improving their culture. The aryl hydrocarbon receptor (AHR) is a ligand-activated transcription factor that besides mediating toxic responses to environmental contaminants plays pivotal physiological roles in various biological processes. Since a novel compound that acts as an antagonist of this receptor has been reported to promote expansion of hematopoietic stem cells, we conducted the present study with the aim of determining whether addition of an established AHR antagonist to the standard culture medium used nowadays for in vitro chicken PGCs culture improves ex vivo expansion. We have found that addition of α-naphthoflavone in culture medium promotes the amplification of undifferentiated cells and that this effect is exerted by the blockade of AHR action. Our results constitute the first report of the successful use of a readily available AHR antagonist to improve avian PGCs expansion, and they further extend the knowledge of the effects of AHR modulation in undifferentiated cells.

  3. NHC Nickel-Catalyzed Suzuki-Miyaura Cross-Coupling Reactions of Aryl Boronate Esters with Perfluorobenzenes.

    Science.gov (United States)

    Zhou, Jing; Berthel, Johannes H J; Kuntze-Fechner, Maximilian W; Friedrich, Alexandra; Marder, Todd B; Radius, Udo

    2016-07-01

    An efficient Suzuki-Miyaura cross-coupling reaction of perfluorinated arenes with aryl boronate esters using NHC nickel complexes as catalysts is described. The efficiencies of different boronate esters (p-tolyl-Beg, p-tolyl-Bneop, p-tolyl-Bpin, p-tolyl-Bcat) and the corresponding boronic acid (p-tolyl-B(OH)2) in this type of cross-coupling reaction were evaluated (eg, ethyleneglycolato; neop, neopentylglycolato; pin, pinacolato; cat, catecholato). Aryl-Beg was shown to be the most reactive boronate ester among those studied. The use of CsF as an additive is essential for an efficient reaction of hexafluorobenzene with aryl neopentylglycolboronates.

  4. Pd(OAc)2/DPPF-catalysed microwave-assisted cyanide-free synthesis of aryl nitriles

    Indian Academy of Sciences (India)

    Dinesh N Sawant; Bhalchandra M Bhanage

    2014-03-01

    This study reports microwave-assisted cyanide-free synthesis of aryl nitriles from aryl halides using palladium acetate/1,1-bis(diphenylphosphino)ferrocene as a new catalyst system. Reported protocol is a rapid, cyanide-free, single step reaction, wherein formamide acts as a solvent as well as a source of cyanide. The use of microwave increases the rate of reaction substantially and it was observed that aryl nitriles can be synthesised in 50 min of microwave irradiation compared to conventional thermal heating protocol which requires 48 h.

  5. Design, Synthesis, Antibacterial and Antifungal Activity of Novel 2-[(E-2-aryl-1-ethenyl]-3-(2-sulfanyl-1H-benzo[d]imidazole-5-yl-3,4- dihydro-4-quinolinones

    Directory of Open Access Journals (Sweden)

    Anisetti Ravinder Nath

    2012-01-01

    Full Text Available The novel 2-[(E-2-aryl-1-ethenyl]-3-(2-sulfanyl-1H-benzo[d]imidazole-5-yl-3,4- dihydro-4-quinolinones (4a-j analogs were synthesized by Knoevenagel condensation of a solution of 2-methyl-3-(2-sulfanyl-1H-benzo[d]imidazole-5-yl-3,4-dihydro-4-quinazolinone (3 with aromatic aldehyde in presence of catalytic amount of piperidine. Compounds (4a-j showed significant biological activity against all the standard strains. All the synthesized compounds were characterized on the basis of their IR, 1H NMR, MASS spectroscopic data and elemental analyses. All the compounds have been tested for antimicrobial and antifungal activity by the cup-plate method.

  6. Multipurpose Compound

    Science.gov (United States)

    1983-01-01

    Specially formulated derivatives of an unusual basic compound known as Alcide may be the answer to effective treatment and prevention of the disease bovine mastitis, a bacterial inflammation of a cow's mammary gland that results in loss of milk production and in extreme cases, death. Manufactured by Alcide Corporation the Alcide compound has killed all tested bacteria, virus and fungi, shortly after contact, with minimal toxic effects on humans or animals. Alcide Corporation credits the existence of the mastitis treatment/prevention products to assistance provided the company by NERAC, Inc.

  7. Induction of aryl hydrocarbon receptor-mediated and estrogen receptor-mediated activities, and modulation of cell proliferation by dinaphthofurans.

    Science.gov (United States)

    Vondrácek, Jan; Chramostová, Katerina; Plísková, Martina; Bláha, Ludek; Brack, Werner; Kozubík, Alois; Machala, Miroslav

    2004-09-01

    A group of heterocyclic aromatic compounds, dinaphthofurans (DNFs), recently have been identified as potentially significant contaminants in freshwater sediments. In the present study, a battery of in vitro assays was used for detection of toxic effects of DNFs that are potentially associated with endocrine disruption and tumor promotion. Dinaphthofurans were found to act as relatively potent inducers of aryl hydrocarbon receptor (AhR)-mediated activity in the chemical-activated luciferase reporter gene expression DR-CALUX assay. The relative AhR-inducing potencies of DNFs were similar or even higher than relative potencies of unsubstituted polycyclic aromatic hydrocarbons (PAHs), with dinaphtho[1,2-b;2'3'-d]furan being the most potent AhR agonist. Two compounds, dinaphtho[2,1-b;2'3'-d]furan and dinaphtho[1,2-b;1'2'-d]furan, induced estrogen receptor (ER)-mediated activity in the estrogen receptor-mediated CALUX (the ER-CALUX) assay. Two types of potential tumor-promoting effects of DNFs were investigated, using in vitro bioassays for detection of inhibition of gap-junctional intercellular communication and detection of a release from contact inhibition. Although the acute inhibition of gap-junctional intercellular communication was not observed, all six tested DNFs were able to release rat liver epithelial WB-F344 cells from contact inhibition at concentrations as low as 100 nM. In summary, the present study indicated that DNFs can exert multiple biological effects in vitro, including induction of the AhR-mediated activity, release of cells from contact inhibition, and induction of ER-mediated activity.

  8. Activation of the aryl hydrocarbon receptor by carbaryl: Computational evidence of the ability of carbaryl to assume a planar conformation.

    Science.gov (United States)

    Casado, Susana; Alonso, Mercedes; Herradón, Bernardo; Tarazona, José V; Navas, José

    2006-12-01

    It has been accepted that aryl hydrocarbon receptor (AhR) ligands are compounds with two or more aromatic rings in a coplanar conformation. Although general agreement exists that carbaryl is able to activate the AhR, it has been proposed that such activation could occur through alternative pathways without ligand binding. This idea was supported by studies showing a planar conformation of carbaryl as unlikely. The objective of the present work was to clarify the process of AhR activation by carbaryl. In rat H4IIE cells permanently transfected with a luciferase gene under the indirect control of AhR, incubation with carbaryl led to an increase of luminescence. Ligand binding to the AhR was studied by means of a cell-free in vitro system in which the activation of AhR can occur only by ligand binding. In this system, exposure to carbaryl also led to activation of AhR. These results were similar to those obtained with the AhR model ligand beta-naphthoflavone, although this compound exhibited higher potency than carbaryl in both assays. By means of computational modeling (molecular mechanics and quantum chemical calculations), the structural characteristics and electrostatic properties of carbaryl were described in detail, and it was observed that the substituent at C-1 and the naphthyl ring were not coplanar. Assuming that carbaryl would interact with the AhR through a hydrogen bond, this interaction was studied computationally using hydrogen fluoride as a model H-bond donor. Under this situation, the stabilization energy of the carbaryl molecule would permit it to adopt a planar conformation. These results are in accordance with the mechanism traditionally accepted for AhR activation: Binding of ligands in a planar conformation.

  9. PCB 126 and other dioxin-like PCBs specifically suppress hepatic PEPCK expression via the aryl hydrocarbon receptor.

    Directory of Open Access Journals (Sweden)

    Wenshuo Zhang

    Full Text Available Dioxins and dioxin-like compounds encompass a group of structurally related heterocyclic compounds that bind to and activate the aryl hydrocarbon receptor (AhR. The prototypical dioxin is 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD, a highly toxic industrial byproduct that incites numerous adverse physiological effects. Global commercial production of the structurally similar polychlorinated biphenyls (PCBs, however, commenced early in the 20(th century and continued for decades; dioxin-like PCBs therefore contribute significantly to total dioxin-associated toxicity. In this study, PCB 126, the most potent dioxin-like PCB, was evaluated with respect to its direct effects on hepatic glucose metabolism using primary mouse hepatocytes. Overnight treatment with PCB 126 reduced hepatic glycogen stores in a dose-dependent manner. Additionally, PCB 126 suppressed forskolin-stimulated gluconeogenesis from lactate. These effects were independent of acute toxicity, as PCB 126 did not increase lactate dehydrogenase release nor affect lipid metabolism or total intracellular ATP. Interestingly, provision of cells with glycerol instead of lactate as the carbon source completely restored hepatic glucose production, indicating specific impairment in the distal arm of gluconeogenesis. In concordance with this finding, PCB 126 blunted the forskolin-stimulated increase in phosphoenolpyruvate carboxykinase (PEPCK mRNA levels without affecting glucose-6-phosphatase expression. Myricetin, a putative competitive AhR antagonist, reversed the suppression of PEPCK induction by PCB 126. Furthermore, other dioxin-like PCBs demonstrated similar effects on PEPCK expression in parallel with their ability to activate AhR. It therefore appears that AhR activation mediates the suppression of PEPCK expression by dioxin-like PCBs, suggesting a role for these pollutants as disruptors of energy metabolism.

  10. Iodine Catalyzed Microwave-Assisted Synthesis of 14-Aryl(Alkyl)-14H-dibenzo[a,j]xanthenes

    Institute of Scientific and Technical Information of China (English)

    DING,Fei-Qing; AN,Li-Tao; ZOU,Jian-Ping

    2007-01-01

    A straightforward and effective procedure for the synthesis of 14-aryl(alkyl)-14H-dibenzo[a,j]xanthenes was described using a catalytic amount of molecular iodine under microwave irradiation to afford the corresponding xanthenes in good yields.

  11. Cooperative effect of silver in copper-catalyzed trifluoromethylation of aryl iodides using Me3SiCF3

    KAUST Repository

    Weng, Zhiqiang

    2011-06-13

    An effective model of cooperative effect of silver for the coppercatalyzed trifluoromethylation of activated and unactivated aryl iodides to trifluoromethylated arenes using Me3SiCF3 was achieved with a broad substrate scope. © 2011 American Chemical Society.

  12. Influences of Alkyl and Aryl Substituents on Iminopyridine Fe(II- and Co(II-Catalyzed Isoprene Polymerization

    Directory of Open Access Journals (Sweden)

    Lihua Guo

    2016-11-01

    Full Text Available A series of alkyl- and aryl-substituted iminopyridine Fe(II complexes 1a–7a and Co(II complexes 2b, 3b, 5b, and 6b were synthesized. The activator effect, influence of temperature, and, particularly, the alkyl and aryl substituents’ effect on catalytic activity, polymer molecular weight, and regio-/stereoselectivity were investigated when these complexes were applied in isoprene polymerization. All of the Fe(II complexes afforded polyisoprene with high molecular weight and moderate cis-1,4 selectivity. In contrast, the Co(II complexes produced polymers with low molecular weight and relatively high cis-1,4 selectivity. In the iminopyridine Fe(II system, the alkyl and aryl substituents’ effect exhibits significant variation on the isoprene polymerization. In the iminopyridine Co(II system, there is little influence observed on isoprene polymerization by alkyl and aryl substituents.

  13. Stereoconservative Negishi arylation and alkynylation as an efficient approach to enantiopure 2,2'-diarylated 1,1'-binaphthyls.

    Science.gov (United States)

    Krascsenicsová, Katarína; Walla, Peter; Kasák, Peter; Uray, Georg; Kappe, C Oliver; Putala, Martin

    2004-11-21

    Negishi arylation and alkynylation of easily synthesized chiral 2,2'-diodo-1,1'-binaphthyl rapidly proceeds in refluxing THF utilizing controlled microwave irradiation, affording enantiopure 2,2'-diarylated 1,1'-binaphthyls in good to excellent yields.

  14. Asymmetric synthesis of gem-diaryl substituted cyclic sulfamidates and sulfamides by rhodium-catalyzed arylation of cyclic ketimines.

    Science.gov (United States)

    Nishimura, Takahiro; Ebe, Yusuke; Fujimoto, Hiroto; Hayashi, Tamio

    2013-06-18

    Asymmetric addition of arylboronates to aryl-substituted cyclic ketimines proceeded in the presence of a rhodium catalyst coordinated with a chiral diene ligand to give high yields of sulfamidates and sulfamides with high enantioselectivity (up to 99% ee).

  15. Cu-catalyzed arylation of the amino group in the indazole ring: regioselective synthesis of pyrazolo-carbazoles.

    Science.gov (United States)

    Anil Kumar, K; Kannaboina, Prakash; Dhaked, Devendra K; Vishwakarma, Ram A; Bharatam, Prasad V; Das, Parthasarathi

    2015-02-07

    Cu(II)-catalyzed cross-coupling of various aryl boronic acids with 5 and 6-amino indazoles has resulted in (arylamino)-indazoles. These (arylamino)-indazoles have been utilized in synthesizing medicinally important pyrazole-fused carbazoles via Pd(II)-catalyzed cross-dehydrogenative coupling (CDC). This combined N-arylation/C-H arylation strategy has been successfully applied to the regioselective synthesis of polyheterocycles 3,6-dihydropyrazolo[3,4-c]carbazoles and 1,6-dihydro pyrazolo[4,3-c]carbazoles. Quantum chemical analysis has been carried out to understand the regioselectivity and to trace the potential energy surface of the entire reaction upon 5-N-aryl-indazole conversion to the corresponding carbazole.

  16. An Efficient Synthesis of Diaryl Ethers by Coupling Aryl Halides with Substituted Phenoxytrimethylsilane in the Presence of TBAF

    Institute of Scientific and Technical Information of China (English)

    Jian Kui ZHAO; Yan Guang WANG

    2003-01-01

    A general synthesis of diaryl ethers via coupling of aryl halides with substitutedphenoxytrimethylsilane in the presence of TBAF is described. The protocol is simple and mild,and gives good to excellent yields.

  17. Catalytic Enantioselective Aryl Transfer to Aldehydes Using Chiral 2,2’-Bispyrrolidine-Based Salan Ligands

    Directory of Open Access Journals (Sweden)

    Yixiang Cheng

    2011-04-01

    Full Text Available Chiral C2-symmetric diamines have emerged as versatile auxiliaries or ligands in numerous asymmetric transformations. Chiral 2,2’-bispyrrolidine-based salan ligands were prepared and applied to the asymmetric aryl transfer to aldehydes with arylboronic acids as the source of transferable aryl groups. The corresponding diarylmethanols were obtained in high yields with moderate to good enantioselectivitives of up to 83% ee.

  18. Cu-catalyzed arylation of phosphinic amide facilitated by (±)-trans-cyclohexane-1,2-diamine

    Institute of Scientific and Technical Information of China (English)

    Juan Li; Song Lin Zhang; Chuan Zhou Tao; Yao Fu; Qing Xiang Guo

    2007-01-01

    Cu-catalyzed cross coupling between phosphinic amides and aryl halides was accomplished for the first time by using (±)-transcyclohexane-1,2-diamine as the ligand. This reaction provided a novel approach for synthesizing arylated phosphinic amides. Both kinetic measurement and theoretical calculation indicated that phosphinic amides were much less reactive than amides by about 10times in Cu-catalyzed cross coupling.

  19. Palladium-catalyzed arylation of ketone enolates: an expeditious entry to tamoxifen-related 1,2,2-triarylethanones.

    Science.gov (United States)

    Churruca, Fátima; SanMartin, Raul; Tellitu, Imanol; Domínguez, Esther

    2002-05-02

    [reaction: see text]. After a rigorous study on the effect of several catalytic systems, a simple, high yielding procedure for the preparation of 1,2,2-triarylethanones, skeletal analogues of tamoxifen, is presented. Apart from the economic and environmental advantages involved, this palladium-catalyzed arylation of deoxybenzoin enolates features a lack of ortho-arylation side reactions. In addition, an alternative approach from acetophenones to the target triarylethanone system is also announced.

  20. A novel synthesis of 2-aryl-2H-indazoles via a palladium-catalyzed intramolecular amination reaction.

    Science.gov (United States)

    Song, J J; Yee, N K

    2000-02-24

    [reaction: see text] A variety of 2-aryl-2H-indazoles were synthesized by the palladium-catalyzed intramolecular amination of the corresponding N-aryl-N(o-bromobenzyl)hydrazines. Of several sets of reaction conditions surveyed, the combination of Pd(OAc)2/dppf/tBuONa gave the best results. This method applies to a wide scope of substrates containing electron-donating and electron-withdrawing substituents.

  1. A unified approach for the synthesis of symmetrical and unsymmetrical dibenzyl ethers from aryl aldehydes through reductive etherification

    Directory of Open Access Journals (Sweden)

    J. Sembian Ruso

    2016-05-01

    Full Text Available In this paper, we describe a simple and convenient conversion of aryl aldehydes to symmetrical dibenzyl ethers through reductive etherification. Similarly, unsymmetrical dibenzyl ether was obtained from aryl aldehyde and TES-protected benzyl alcohol. Triethyl silane with catalytic amount of InCl3 was found to be an efficient condition for the reductive etherification. Moreover, it exhibits remarkable functional group compatibility with yield ranging from good to excellent.

  2. Intermetallic Compounds

    Science.gov (United States)

    Takagiwa, Y.; Matsuura, Y.; Kimura, K.

    2014-06-01

    We have focused on the binary narrow-bandgap intermetallic compounds FeGa3 and RuGa3 as thermoelectric materials. Their crystal structure is FeGa3-type (tetragonal, P42/ mnm) with 16 atoms per unit cell. Despite their simple crystal structure, their room temperature thermal conductivity is in the range 4-5-W-m-1-K-1. Both compounds have narrow-bandgaps of approximately 0.3-eV near the Fermi level. Because their Seebeck coefficients are quite large negative values in the range 350-FeGa3 and RuGa3 as n and p-type materials. The dimensionless figure of merit, ZT, was significantly improved by substitution of Sn for Ga in FeGa3 (electron-doping) and by substitution of Zn for Ga in RuGa3 (hole-doping), mainly as a result of optimization of the electronic part, S 2 σ.

  3. Compound odontoma

    Directory of Open Access Journals (Sweden)

    Monica Yadav

    2012-01-01

    Full Text Available Odontomas have been extensively reported in the dental literature, and the term refers to tumors of odontogenic origin. Though the exact etiology is still unknown, the postulated causes include: local trauma, infection, inheritance and genetic mutation. The majority of the lesions are asymptomatic; however, may be accompanied with pain and swelling as secondary complaints in some cases. Here, we report a case of a compound odontome in a 14 year old patient.

  4. Organic Compounds

    Science.gov (United States)

    Shankland, Kenneth

    For many years, powder X-ray diffraction was used primarily as a fingerprinting method for phase identification in the context of molecular organic materials. In the early 1990s, with only a few notable exceptions, structures of even moderate complexity were not solvable from PXRD data alone. Global optimisation methods and highly-modified direct methods have transformed this situation by specifically exploiting some well-known properties of molecular compounds. This chapter will consider some of these properties.

  5. Rh(I)-Catalyzed Arylation of Heterocycles via C-H Bond Activation: Expanded Scope Through Mechanistic Insight

    Energy Technology Data Exchange (ETDEWEB)

    Lewis, Jared; Berman, Ashley; Bergman, Robert; Ellman, Jonathan

    2007-07-18

    A practical, functional group tolerant method for the Rh-catalyzed direct arylation of a variety of pharmaceutically important azoles with aryl bromides is described. Many of the successful azole and aryl bromide coupling partners are not compatible with methods for the direct arylation of heterocycles using Pd(0) or Cu(I) catalysts. The readily prepared, low molecular weight ligand, Z-1-tert-butyl-2,3,6,7-tetrahydrophosphepine, which coordinates to Rh in a bidentate P-olefin fashion to provide a highly active yet thermally stable arylation catalyst, is essential to the success of this method. By using the tetrafluoroborate salt of the corresponding phosphonium, the reactions can be assembled outside of a glove box without purification of reagents or solvent. The reactions are also conducted in THF or dioxane, which greatly simplifies product isolation relative to most other methods for direct arylation of azoles employing high-boiling amide solvents. The reactions are performed with heating in a microwave reactor to obtain excellent product yields in two hours.

  6. Microwave assisted synthesis and antimicrobial activity of novel 1-[1/2-(1-Benzyl-1H-[1,2,3]triazol-4-ylmethoxy-naphthalen-2/1-yl]-3-(1-phenyl-3-aryl-1H-pyrazol-4-yl-propenones

    Directory of Open Access Journals (Sweden)

    Dongamanti Ashok

    2015-06-01

    Full Text Available A series of novel 1-[1/2-(1-Benzyl-1H-[1,2,3]triazol-4-ylmethoxy-naphthalen-2/1-yl]-3-(1-phenyl-3-aryl-1H-pyrazol-4-yl-propenones were design and synthesized by Click reaction followed by Claisen-Schmidt condensation under microwave irradiation and conventional heating methods. The structures of newly synthesized compounds have been established on the basis of elemental analysis, IR, 1H & 13C NMR and mass spectral data. All the compounds were screened for their antimicrobial activity.

  7. Understanding and Exploitation of Neighboring Heteroatom Effect for the Mild N-Arylation of Heterocycles with Diaryliodonium Salts under Aqueous Conditions: A Theoretical and Experimental Mechanistic Study.

    Science.gov (United States)

    Bihari, Tamás; Babinszki, Bence; Gonda, Zsombor; Kovács, Szabolcs; Novák, Zoltán; Stirling, András

    2016-07-01

    The mechanism of arylation of N-heterocycles with unsymmetric diaryliodonium salts is elucidated. The fast and efficient N-arylation reaction is interpreted in terms of the bifunctionality of the substrate: The consecutive actions of properly oriented Lewis base and Brønsted acid centers in sufficient proximity result in the fast and efficient N-arylation. The mechanistic picture points to a promising synthetic strategy where suitably positioned nucleophilic and acidic centers enable functionalization, and it is tested experimentally.

  8. Antioxidant and DNA damage inhibition activities of 4-Aryl-N-(4-arylthiazol-2-yl)-5,6-dihydro-4H-1,3,4-oxadiazine-2-carboxamides

    Indian Academy of Sciences (India)

    K Shubakara; K B Umesha; N Srikantamurthy; J Chethan

    2014-11-01

    A series of 4-aryl--(4-pheny-thiazol-2-yl)-5,6-dihydro-4-1,3,4-oxadiazine-2-carboxamides were synthesized by condensing 4-aryl-5,6-dihydro-4-1,3,4-oxadiazine-2-carboxylic acid with 2-amino-4-aryl-thiazole derivatives. The newly synthesized molecules were characterized by spectral analysis and subjected to antioxidant and DNA damage inhibition studies.

  9. N-Aryl Arenedicarboximides as Tunable Panchromatic Dyes for Molecular Solar Cells

    Directory of Open Access Journals (Sweden)

    Zhi Cao

    2010-01-01

    Full Text Available Three organic dyes designed as molecular dyads were prepared that feature a common naphthalimide acceptor and N-aryl donors. One of these incorporated an additional cyanoacrylic acid linker and conjugated thiophene bridge inserted between donor and acceptor groups. Electrochemical and photochemical characterizations have been carried out on nanocrystalline TiO2 dye-sensitized solar cells which were fabricated with these dyes as the sensitizing component. HOMO and LUMO energies were also calculated using TDDFT methods and validated by the cyclic voltammetry method. A key finding from this study indicates that computational methods can provide energy values in close agreement to experimental for the N-aryl-naphthalimide system. Relative to HOMO/LUMO energy levels of N719, the dyes based on naphthalimide chromophore are promising candidates for metal-free DSSCs.

  10. Synthesis of Poly(aryl amide imide)s Derived from o-diphenyltrimellitic Anhydride

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The synthesis and characterization of a series of novel poly(aryl amide imide)s based on o-diphenyltrimellitic anhydride are described.The poly(aryl amide-imide)s having inherent viscosities of 0.39-1.43dL/g in N-methyl-2-pyrrolidinone at 30℃,were prepared by polymerization with aromatic diamines in N,N-dimethylacetamide and subsequent chemical imidization.All the polymers were amorphous,readily soluble in aprotic polar solvents such as DMAC,NMP,DMF,DMSO,and m-cresol,and could be cast to form flexible and tough films.The glass trsanition temperatures were in the range of 284-336℃,and the temperatures for 5% weight loss in nitrogen were above 468℃.

  11. Simple preparation of new N-aryl-N-(3-indolmethyl acetamides and their spectroscopic analysis

    Directory of Open Access Journals (Sweden)

    José A. Henao

    2009-12-01

    Full Text Available To prepare new indolic molecules and characterize them by spectroscopic methods. Materials and methods: All reagentswere purchased from Aldrich, commercial grade. The purity of the products and the composition of the reaction mixtures were monitoredby thin layer chromatography over Silufol UV254 0.25 mm-thick chromatoplates. Product isolation and purification were performed bycolumn chromatography (SiO2, using ethyl acetate-petroleum ether mixtures as eluents. Results. The synthesis of new N-aryl-N-(3-indolmethyl acetamides based on first step iminization reaction of indol-3-carbaldehyde is accomplished. The structures of the C-3substituted indoles were confirmed by 1H-NMR and 13C-NMR studies supported by inverse-detected 2D NMR experiments and alsothrough monocrystal X-ray diffraction. Conclusions. An efficient, economic, and fast synthetic route was designed to the construction ofthe N-aryl-N-(3-indolmethyl acetamides, structural analogues of some alkaloids.

  12. Structure-activity relationship study on N-(1,2,3,4-tetrahydronaphthalen-1-yl)-4-aryl-1-piperazinehexanamides, a class of 5-HT7 receptor agents. 2.

    Science.gov (United States)

    Leopoldo, Marcello; Lacivita, Enza; Contino, Marialessandra; Colabufo, Nicola A; Berardi, Francesco; Perrone, Roberto

    2007-08-23

    Here we report the synthesis of N-(1,2,3,4-tetrahydronaphthalen-1-yl)-4-aryl-1-piperazinealkylamides 16-29 that were designed to elucidate both structure-affinity and -activity relationships for the 5-HT7 receptor, by targeting the substituent in 2-position of the aryl linked to the piperazine ring. The affinities of 16-29 for 5-HT7, 5-HT1A, 5-HT2A, and D2 receptors were assessed by radioligand binding assays. The intrinsic activities at the 5-HT7 receptor of the most potent compounds were determined. A series of substituents covering a wide range of electronic, steric, and polar properties was evaluated, revealing a key role on 5-HT7 receptor affinity and intrinsic activity. Certain lipophilic substituents (SCH3, CH(CH3)2, N(CH3)2, CH3, Ph) led to high-affinity agonists, whereas OH and NHCH3 substituents switched intrinsic activity toward antagonism. 4-[2-(1-Methylethyl)phenyl]-N-(1,2,3,4-tetrahydronaphthalen-1-yl)-1-piperazinehexanamide (19), 4-(2-diphenyl)-N-(1,2,3,4-tetrahydronaphthalen-1-yl)-1-piperazinehexanamide (21), and 4-(2-dimethylaminophenyl)-N-(1,2,3,4-tetrahydronaphthalen-1-yl)-1-piperazinehexanamide (22) were identified as potent 5-HT7 receptor agonists (Ki = 0.13-1.1 nM, EC50 = 0.90-1.77 microM), showing selectivity over 5-HT1A, 5-HT2A, and D2 receptors.

  13. Restricted utility of aryl isoprenoids as indicators of photic zone anoxia

    OpenAIRE

    Sinninghe Damsté, J.S.; Koopmans, M. P.; S. Schouten; Kohnen, M.E.L.

    1996-01-01

    In a North Sea oil, the carotenoid derivatives -carotene, -isorenieratane, and isorenieratane were identified, together with a series of aryl isoprenoids with a 2,3,6-trimethyl substitution pattern for the aromatic ring. The 13C values of -carotene and -isorenieratane are similar, whereas isorenieratane is ca. 15% heavier. This suggests that -isorenieratane is not derived from -isorenieratane biosynthesised by Chlorobiaceae, but from aromatisation of -carotene. This was confirmed by laborator...

  14. Palladium-Catalyzed Suzuki-Miyaura Type Coupling Reaction of Aryl Halides with Triphenylborane-Pyridine

    Institute of Scientific and Technical Information of China (English)

    杨明华; 顾勇冰; 王艳; 赵玺玉; 严国兵

    2012-01-01

    The Suzuki-Miyaura type coupling reaction of aryl halides with triphenylborane-pyridine was described. The reaction can be catalyzed by Pd(OAc)2 (5 mol%) in presence of Cs2CO3 at 50 ℃ or 80 ℃, and functionalized biaryls were obtained in good to excellent yields. This protocol is general and can tolerate a wide range of func- tional groups.

  15. Extending the utility of [Pd(NHC)(cinnamyl)Cl] precatalysts: Direct arylation of heterocycles

    OpenAIRE

    Anthony R Martin; Anthony Chartoire; Slawin, Alexandra M. Z.; Nolan, Steven P

    2012-01-01

    The use of [Pd(NHC)(cinnamyl)Cl] precatalysts in the direct arylation of heterocycles has been investigated. Among four different precatalysts, [Pd(SIPr)(cinnamyl)Cl] proved to be the most efficient promoter of the reaction. The C–H functionalization of sulfuror nitrogen-containing heterocycles has been achieved at low catalyst loadings. These catalyst charges range from 0.1 to 0.01 mol % palladium. Publisher PDF Peer reviewed

  16. A mild and simple synthesis of N-aryl substituted toluenesulfamides under solvent-free conditions

    Institute of Scientific and Technical Information of China (English)

    ZHAO Na; WANG Yu-lu

    2004-01-01

    N- aryl substituted benzenesulfamides are often used as heating-sensitive recording material1, thermal printing material2, sensitizer3 and developer4. Moreover, some of the benzenesulfamides have antifungal activities5. Many methods have been described for preparation of sulfamides. They are used to carry out in solvent8 or in solid phase condition9. These methods required solvent or solid support and even required heating or cooling. At the same time, the process of these methods is complex. Now we have developed a new method to prepare N-aryl substituted toluenesulfamides under solvent-free conditions.In recent years, solvent-free technology has gained popularity in organic synthesis. For instance,solidstate reaction and microwave reaction have received considerable attention. Solvent-free synthesis of amides has been reported10-11. This technology has many advantages such as high efficiency and selectivity, easy separation and environmental acceptability. All these merits are in accord with green chemistry's requirements of energy-saving, high efficiency and environmental benefits.In our paper, we used a simple and efficient method for preparing N-aryl substituted toluenesulfamides under solvent-free conditions, as a replacement for classic solvent, which gives many environmental benefits.All reactions were completed at room temperature by co-grinding in an agate mortar for 3-20min and the results are shown in Table 1.In conclusion, we have developed an efficient and convenient method of preparation N-aryl substituted toluenesulfamides in high yields. It symbols an improvement for synthesis of benzenesulfamides.

  17. Lineage-dependent effects of aryl hydrocarbon receptor agonists contribute to liver tumorigenesis

    OpenAIRE

    Harrill, Joshua A.; Bethany B Parks; Wauthier, Eliane; Rowlands, J. Craig; Reid, Lola M.; Thomas, Russell S.

    2015-01-01

    Rodent cancer bioassays indicate that the aryl hydrocarbon receptor (AHR) agonist, 2,3,7,8-tetracholorodibenzo-p-dioxin (TCDD), causes increases in both hepatocytic and cholangiocytic tumors. Effects of AHR activation have been evaluated on rodent hepatic stem cells (rHpSCs) versus their descendants, hepatoblasts (rHBs), two lineage stages of multipotent, hepatic precursors with overlapping but also distinct phenotypic traits. This was made possible by defining the first successful culture co...

  18. Aryl Hydrocarbon Receptor Activation by TCDD Reduces Inflammation Associated with Crohn's Disease

    OpenAIRE

    Benson, Jenna M.; Shepherd, David M.

    2010-01-01

    Crohn's disease results from a combination of genetic and environmental factors that trigger an inappropriate immune response to commensal gut bacteria. The aryl hydrocarbon receptor (AhR) is well known for its involvement in the toxicity of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), an environmental contaminant that affects people primarily through the diet. Recently, TCDD was shown to suppress immune responses by generating regulatory T cells (Tregs). We hypothesized that AhR activation da...

  19. Solid-Phase Organic Synthesis of Aryl Vinyl Ethers Using Sulfone-Linking Strategy

    Institute of Scientific and Technical Information of China (English)

    余腊妹; 汤妮; 盛寿日; 陈茹冰; 刘晓玲; 蔡明中

    2012-01-01

    A novel facile solid-phase organic synthesis of aryl vinyl ethers by reaction of polystyrene-supported 2-phenylsulfonylethanol with phenols under Mitsunobu conditions and subsequent elimination reaction with DBU has been developed. The advantages of this method include straightforward operation, good yield and high purity of the products. Alternatively, a typical example of Suzuki coupling reaction on-resin was further applied to prepare 4-phenylphenyl vinyl ether for extending this method.

  20. REGULATION OF CENTRAL NERVOUS SYSTEM AUTOIMMUNITY BY THE ARYL HYDROCARBON RECEPTOR

    OpenAIRE

    Quintana, Francisco J.

    2013-01-01

    The ligand-activated transcription factor aryl hydrocarbon receptor controls the activity of several components of the immune system, many of which play an important role in neuroinflammation. This review discusses the role of AhR in T cells and dendritic cells, its relevance for the control of autoimmunity in the central nervous system, and its potential as a therapeutic target for immune mediated disorders.

  1. Microwave-Assisted Synthesis of Some 3,5-Arylated 2-Pyrazolines

    Directory of Open Access Journals (Sweden)

    Hassan Ghasemnejad

    2003-07-01

    Full Text Available Condensation of 2-acetylnaphthalene with benzaldehydes under microwave irradiation affords chalcones which undergo facile and clean cyclizations with hydrazines RNHNH2 (R= H, Ph, Ac to afford 3,5-arylated 2-pyrazolines in quantitative yields, also under microwave irradiation and in the presence of dry AcOH as cyclizing agent. The results obtained indicate that, unlike classical heating, microwave irradiation results in higher yields, shorter reaction times (2-12 min. and cleaner reactions.

  2. Direct Arylation Strategies in the Synthesis of π-Extended Monomers for Organic Polymeric Solar Cells

    OpenAIRE

    Andrea Nitti; Riccardo Po; Gabriele Bianchi; Dario Pasini

    2016-01-01

    π-conjugated macromolecules for organic polymeric solar cells can be rationally engineered at the molecular level in order to tune the optical, electrochemical and solid-state morphology characteristics, and thus to address requirements for the efficient solid state device implementation. The synthetic accessibility of monomers and polymers required for the device is getting increasing attention. Direct arylation reactions for the production of the π-extended scaffolds are gaining importance,...

  3. Synthesis, structure and ring-opening polymerization of macrocyclic arylates containing phthalic unit

    Institute of Scientific and Technical Information of China (English)

    姜洪焱; 陈天禄; 邢彦; 林永华; 徐纪平

    1997-01-01

    A series of maerocyclic arylate diraers have been selectively synthesized by an interfacial polyconden-sation of o-phthaloyldichloride with bisphenols A combination of GPC,FAB-MS,1H and 13C NMR unambiguously confirmed the cyclic nature Although single-crystal X-ray analysis of two such macrocycles reveals no severe strain on the cyclic structures,these macrocycles can undergo facile melt polymerization to give high molecular weight polyary-lates.

  4. Synthesis of Poly(aryl ether ketone) Copolymers Containing Adamantyl-substituted Naphthalene Rings

    Institute of Scientific and Technical Information of China (English)

    ZHU Xiao-liang; ZHANG Shu-ling; REN Dian-fu; GUAN Shao-wei; WANG Gui-bin; JIANG Zhen-hua

    2009-01-01

    @@ 1 Introduction High performance polymers have received considerable attention over the past decade owing to their increased demands as replacements for metals or ceramics in automotive,aerospace,and microelectronic industries.Poly(aryl ether ketone)s(PAEKs) are a class of important high-performance aromatic polymers with excellent mechanical properties,good solvent resistance,size-accuracy,electrical characteristics,and superior thermal stability[1-3].

  5. A Copper-Assisted Palladium(II)-catalyzed Direct Arylation of Cyclic Enaminones with Arylboronic Acids

    OpenAIRE

    Kim, Yong Wook; Niphakis, Micah J.; Georg, Gunda I.

    2012-01-01

    Described herein is a palladium(II)-catalyzed direct arylation of cyclic enaminones with arylboronic acids. The versatility of this method is that both electron-rich and electron-poor boronic acids can be coupled in high yields. A mixture of two Cu(II) additives was crucial for efficient cross-coupling. The role of each Cu(II) reagent appears to be distinct and complementary serving to assist catalyst reoxidation and transmetallation through a putative arylcopper intermediate.

  6. Photoinduced intramolecular substitution reaction of aryl halide with carbonyl oxygen of amide group

    CERN Document Server

    Park, Y T; Kim, M S; Kwon, J H

    2002-01-01

    Photoreaction of N-(o-halophenyl)acetamide in basic acetonitrile produces an intramolecular substituted product, 2-methylbenzoxazole in addition to reduced product, acetanilide, whereas photoreaction of N-(o-halobenzyl)acetamide affords a reduced product, N-benzylacetamide only. On the basis of preparative reaction, kinetics, and UV/vis absorption behavior, an electrophilic aromatic substitution of aryl halide with oxygen of its amide bond are proposed.

  7. Dehalogenation of Aryl Halides Catalyzed by Montmorillonite Immobilized Bimetal Catalyst in Aqueous System

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    A novel bisupported bimetal catalyst PVP-PdCl2-FeSO4/Al-Mont-PEG600 was prepared by immobilization of PVP (poly (N-vinyl-2-pyrrolidone)) supported bimetallic catalyst using alumina pillared inartificial montmorillonite as the carrier. This catalyst has good dehalogenation activity and selectivity to aryl halides-o-chlorotoluene in aqueous system in the presence of phase transfer catalyst (PEG) and sodium formate as hydrogen source. The catalyst also shows good reusability.

  8. Restricted utility of aryl isoprenoids as indicators for photic zone anoxia

    Science.gov (United States)

    Koopmans, Martin P.; Schouten, Stefan; Kohnen, Math E. L.; Sinninghe Damsté, Jaap S.

    1996-12-01

    In a North Sea oil, the carotenoid derivatives β-carotene, β-isorenieratane, and isorenieratane were identified, together with a series of aryl isoprenoids with a 2,3,6-trimethyl substitution pattern for the aromatic ring. The δ13C values of β-carotene and β-isorenieratane are similar, whereas isorenieratane is ca. 15% heavier. This suggests that β-isorenieratane is not derived from β-isorenieratane biosynthesised by Chlorobiaceae, but from aromatisation of β-carotene. This was confirmed by laboratory aromatisation of partially hydrogenated β-carotene, which yielded β-isorenieratane as the main product. The aryl isoprenoids, which can be formed by Csbnd C bond cleavage of both isorenieratane and β-isorenieratane, have a mixed isotopic signature in the oil. These results indicate that mere identification of aryl isoprenoids, without determination of their δ13C values, cannot be used to assess the presence of Chlorobiaceae, and, thus, photic zone anoxia in the depositional environment.

  9. Synthesis and thermal degradation characterization of novel poly(phosphazene-aryl amides

    Directory of Open Access Journals (Sweden)

    Z. P. Zhao

    2012-04-01

    Full Text Available New fully aromatic poly(phosphazene-aryl amides were prepared by polycondensation reaction of our synthesized aromatic diamine: 1,1,3,5-tetraphenoxy-4,6-bis(4-aminophenoxyoligocyclotriphosphazene (monomer 1 with terephthaloyl dichloride. Their chemical structure and composition were characterized by elemental analysis, 1H and 31P NMR (Nuclear Magnetic Resonance, and FT-IR (Fourier transform infrared spectroscopy, whereas their thermal degradation properties were determined by DSC (Differential Scanning Calorimetry and TGA (Thermal Gravimertic Analysis techniques. The solid residues of all samples were analysed by FT-IR and SEM (Scanning Electron Microscopy. Compared to conventional PPTA (poly(p-phenylene terephthamide, PPAA (poly(phosphazene-aryl amide shows excellent thermal stability and solubility in polar protic solvents. All poly(phosphazene-aryl amides show two thermal degradation in the temperature range 150–600°C. The monomer 1, due to its structure, shows the first maximum rate of thermal decomposition temperature around 150–350°C, which may be due to the decomposition of the P–O–C bone. Morphology of the solid residues by Scanning Electron Microscope exhibit that the granular of the solid residues gradual disappearance with the increase of monomer 1 content. The surface layer of PPAA solid residues has been grumous, for the syneresis of P–O–P took place.

  10. Ruthenium-catalyzed α-(hetero)arylation of saturated cyclic amines: reaction scope and mechanism.

    Science.gov (United States)

    Peschiulli, Aldo; Smout, Veerle; Storr, Thomas E; Mitchell, Emily A; Eliáš, Zdeněk; Herrebout, Wouter; Berthelot, Didier; Meerpoel, Lieven; Maes, Bert U W

    2013-07-29

    Transition-metal-catalyzed sp(3) C-H activation has emerged as a powerful approach to functionalize saturated cyclic amines. Our group recently disclosed a direct catalytic arylation reaction of piperidines at the α position to the nitrogen atom. 1-(Pyridin-2-yl)piperidine could be smoothly α-arylated if treated with an arylboronic ester in the presence of a catalytic amount of [Ru3(CO)12] and one equivalent of 3-ethyl-3-pentanol. A systematic study on the substrate and reagent scope of this transformation is disclosed in this paper. The effect of substitution on both the piperidine ring and the arylboronic ester has been investigated. Smaller (pyrrolidine) and larger (azepane) saturated ring systems, as well as benzoannulated derivatives, were found to be compatible substrates with the α-arylation protocol. The successful use of a variety of heteroarylboronic esters as coupling partners further proved the power of this direct functionalization method. Mechanistic studies have allowed for a better understanding of the catalytic cycle of this remarkable transformation featuring an unprecedented direct transmetalation on a Ru(II)-H species.

  11. Antifungal compounds from the rhizome and roots of Ferula hermonis.

    Science.gov (United States)

    Al-Ja'fari, Abdel-Hadi; Vila, Roser; Freixa, Blanca; Costa, Joan; Cañigueral, Salvador

    2013-06-01

    The antifungal activity of hexane, dichloromethane, methanol and aqueous extracts from the rhizome and root of Ferula hermonis was assayed in vitro by the agar disk diffusion method against a panel of human opportunistic and pathogenic fungi. Among them, the hexane and dichloromethane extracts showed the highest activity particularly against the dermatophytes Microsporum gypseum and Tricophyton mentagrophytes as well as the yeast Candida lactis-condensi. Activity-guided fractionation of both extracts using an agar overlay bioautographic method led to the isolation of two antifungal compounds which were identified as the daucane aryl esters jaeschkeanadiol p-hydroxybenzoate (ferutinin) and jaeschkeanadiol benzoate (teferidin). Determination of minimal inhibitory concentration (MIC) and minimal fungicidal concentration (MFC) values of both compounds evidenced a stronger antifungal activity for ferutinin than for teferidin. Particularly, T. mentagrophytes was the most sensitive strain with MIC and MFC values ranging from 8 to 256 µg/mL.

  12. Synthesis and Regioselective Reaction of Some Unsymmetrical Heterocyclic Chalcone Derivatives and Spiro Heterocyclic Compounds as Antibacterial Agents.

    Science.gov (United States)

    El-Hashash, Maher A; Rizk, Sameh A; Atta-Allah, Saad R

    2015-12-10

    A number of novel heterocyclic chalcone derivatives can be synthesized by thermal and microwave tools. Treatment of 4-(4-Acetylamino- and/or 4-bromo-phenyl)-4-oxobut-2-enoic acids with hydrogen peroxide in alkaline medium were afforded oxirane derivatives 2. Reaction of the epoxide 2 with 2-amino-5-aryl-1,3,4-thiadiazole derivatives yielded chalcone of imidazo[2,1-b]thiadiazole derivative 4 via two thermal routes. In one pot reaction of 4-bromoacetophenone, diethyloxalate, and 2-amino-5-aryl-1,3,4-thiadiazole derivatives in MW irradiation (W 250 and T 150 °C) under eco-friendly conditions afforded an unsuitable yield of the desired chalcone 4d. The chalcone derivatives 4 were used as a key starting material to synthesize some new spiroheterocyclic compounds via Michael and aza-Michael adducts. The chalcone 4f was similar to the aryl-oxo-vinylamide derivatives for the inhibition of tyrosine kinase and cancer cell growth. The electron-withdrawing substituents, such as halogens, and 2-amino-1,3,4-thiadiazole moeity decreasing the electron density, thereby decreasing the energy of HOMO, and the presence of imidazothiadiazole moiety should improve the antibacterial activity. Thus, the newly synthesized compounds were evaluated for their anti-bacterial activity against (ATCC 25923), (ATCC 10987), (ATCC 274,) and (SM514). The structure of the newly synthesized compounds was confirmed by elemental analysis and spectroscopic data.

  13. 1-芳基-2-吡咯烷酮衍生物的合成研究%Study on the Synthesis of 1-Aryl-2-pyrrolidinone Derivatives

    Institute of Scientific and Technical Information of China (English)

    赵军; 王德传; 曹燕

    2012-01-01

    1-芳基-2-吡咯烷酮衍生物是重要的有机合成中间体.以苯佐卡因为原料,经溴代、缩合、环合合成了目标产物,产物总收率达72.25%.其结构经1H NMR,MS进行了确证.该方法具有操作简便、成本低、收率高等优点.%1-Aryl-2-pyrrolidinone derivatives are important intermediates for organic synthesis. A novel process was developed for the synthesis of the title compound in an overall yield of 72.2% starting from benzocaine via bromination,nucleophilic substitution and cyclization. The structure of the target compound was confirmed with 1H NMR and MS. This method shows advantages of easy operation,low cost and high yield.

  14. Magnesium compounds

    Science.gov (United States)

    Kramer, D.A.

    2012-01-01

    Seawater and natural brines accounted for about 57 percent of magnesium compounds produced in the United States in 2011. Dead-burned magnesia was produced by Martin Marietta Magnesia Specialties LLC from well brines in Michigan. Caustic-calcined magnesia was recovered from seawater by Premier Magnesia LLC in Florida, from well brines in Michigan by Martin Marietta and from magnesite in Nevada by Premier Magnesia. Intrepid Potash Wendover LLC and Great Salt Lake Minerals Corp. recovered magnesium chloride brines from the Great Salt Lake in Utah. Magnesium hydroxide was produced from seawater by SPI Pharma Inc. in Delaware and Premier Magnesia in Florida, and by Martin Marietta from its brine operation in Michigan.

  15. Novel 5-Substituted 2-(Aylmethylthio-4-chloro-N-(5-aryl-1,2,4-triazin-3-ylbenzenesulfonamides: Synthesis, Molecular Structure, Anticancer Activity, Apoptosis-Inducing Activity and Metabolic Stability

    Directory of Open Access Journals (Sweden)

    Beata Żołnowska

    2016-06-01

    Full Text Available A series of novel 5-substituted 2-(arylmethylthio-4-chloro-N-(5-aryl-1,2,4-triazin-3-yl benzenesulfonamide derivatives 27–60 have been synthesized by the reaction of aminoguanidines with an appropriate phenylglyoxal hydrate in glacial acetic acid. A majority of the compounds showed cytotoxic activity toward the human cancer cell lines HCT-116, HeLa and MCF-7, with IC50 values below 100 μM. It was found that for the analogues 36–38 the naphthyl moiety contributed significantly to the anticancer activity. Cytometric analysis of translocation of phosphatidylserine as well as mitochondrial membrane potential and cell cycle revealed that the most active compounds 37 (HCT-116 and HeLa and 46 (MCF-7 inhibited the proliferation of cells by increasing the number of apoptotic cells. Apoptotic-like, dose dependent changes in morphology of cell lines were also noticed after treatment with 37 and 46. Moreover, triazines 37 and 46 induced caspase activity in the HCT-116, HeLa and MCF-7 cell lines. Selected compounds were tested for metabolic stability in the presence of pooled human liver microsomes and NADPH, both R2 and Ar = 4-CF3-C6H4 moiety in 2-(R2-methylthio-N-(5-aryl-1,2,4-triazin-3-ylbenzenesulfonamides simultaneously increased metabolic stability. The results pointed to 37 as a hit compound with a good cytotoxicity against HCT-116 (IC50 = 36 μM, HeLa (IC50 = 34 μM cell lines, apoptosis-inducing activity and moderate metabolic stability.

  16. Novel structural features in the GMC family of oxidoreductases revealed by the crystal structure of fungal aryl-alcohol oxidase.

    Science.gov (United States)

    Fernández, Israel S; Ruíz-Dueñas, Francisco J; Santillana, Elena; Ferreira, Patricia; Martínez, María Jesús; Martínez, Angel T; Romero, Antonio

    2009-11-01

    Lignin biodegradation, a key step in carbon recycling in land ecosystems, is carried out by white-rot fungi through an H(2)O(2)-dependent process defined as enzymatic combustion. Pleurotus eryngii is a selective lignin-degrading fungus that produces H(2)O(2) during redox cycling of p-anisylic compounds involving the secreted flavoenzyme aryl-alcohol oxidase (AAO). Here, the 2.4 A resolution X-ray crystal structure of this oxidoreductase, which catalyzes dehydrogenation reactions on various primary polyunsaturated alcohols, yielding the corresponding aldehydes, is reported. The AAO crystal structure was solved by single-wavelength anomalous diffraction of a selenomethionine derivative obtained by Escherichia coli expression and in vitro folding. This monomeric enzyme is composed of two domains, the overall folding of which places it into the GMC (glucose-methanol-choline oxidase) oxidoreductase family, and a noncovalently bound FAD cofactor. However, two additional structural elements exist in the surroundings of its active site that modulate the access of substrates; these are absent in the structure of the model GMC oxidoreductase glucose oxidase. The folding of these novel elements gives rise to a funnel-like hydrophobic channel that connects the solvent region to the buried active-site cavity of AAO. This putative active-site cavity is located in front of the re side of the FAD isoalloxazine ring and near two histidines (His502 and His546) that could contribute to alcohol activation as catalytic bases. Moreover, three aromatic side chains from two phenylalanines (Phe397 and Phe502) and one tyrosine (Tyr92) at the inner region of the channel form an aromatic gate that may regulate the access of the enzyme substrates to the active site as well as contribute to the recognition of the alcohols that can effectively be oxidized by AAO.

  17. THE COORDINATION COMPOUNDS OF COBALT (II, III WITH DITHIOCARBAMIC ACID DERIVATIVES — MODIFICATORS OF HYDROLYTIC ENZYMES ACTIVITY

    Directory of Open Access Journals (Sweden)

    L. D. Varbanets

    2013-02-01

    Full Text Available Chloride, bromide and isothiocyanate complexes of cobalt(II with N-substituted thiocarbamoyl-N?-pentamethylenesulfenamides (1–(12, and also complexes of cobalt(II, Ш with derivatives of morpholine-4-carbodithioic acid (13–(18 have been used as modificators of enzymes of hydrolytic action — Bacillus thurin-giensis ІМВ В-7324 peptidases, Bacillus subtilis 147 and Aspergillus flavus var. oryzae 80428 amylases, Eupenicillium erubescens 248 and Cryptococcus albidus 1001 rhamnosidases. It was shown that cobalt (II, Ш compounds influence differently on the activity of enzymes tested, exerted both inhibitory and stimulatory action. It gives a possibility to expect that manifestation of activity by complex molecule depends on ligand and anion presence — Cl–, Br– or NCS–. The high activating action of cobalt(II complexes with N-substituted thiocarbamoyl-N?-pentamethylenesulphenamides (1–(12 on elastase and fibrinolytic activity of peptidases compared to tris(4-morpholinecarbodithioatocobalt(ІІІ (14 and products of its interaction with halogens (15–(17, causes inhibitory effect that is probably due to presence of a weekly S–N link, which is easy subjected to homolytic breaking. The studies of influences of cobalt(II complexes on activity of C. аlbidus and E. еrubescens ?-Lrhamnosidases showed, that majority of compounds inhibits of its activity, at that the most inhibitory effect exerts to C. аlbidus enzyme.To sum up, it is possible to state that character of influence of cobalt(II complexes with N-substituted thiocarbamoyl-N?-pentamethylenesulphenamides, and also cobalt(II, Ш complexes with derivatives of morpholine-4-carbodithioic acid varies depending on both strain producer and enzyme tested. The difference in complex effects on enzymes tested are due to peculiarities of building and functional groups of their active centers, which are also responsible for binding with modificators.

  18. High-resolution laser spectroscopy and magnetic effect of the B{sup ~2}E{sup ′}←X{sup ~2}A{sub 2}{sup ′} transition of the {sup 15}N substituted nitrate radical

    Energy Technology Data Exchange (ETDEWEB)

    Tada, Kohei; Teramoto, Kanon [Graduate School of Science, Kobe University, Kobe 657-8501 (Japan); Ishiwata, Takashi [Graduate School of Information Sciences, Hiroshima City University, Hiroshima 731-3194 (Japan); Hirota, Eizi [The Graduate University for Advanced Studies, Kanagawa 240-0193 (Japan); Kasahara, Shunji, E-mail: kasha@kobe-u.ac.jp [Graduate School of Science, Kobe University, Kobe 657-8501 (Japan); Molecular Photoscience Research Center, Kobe University, Kobe 657-8501 (Japan)

    2015-03-21

    Rotationally resolved high-resolution fluorescence excitation spectra of the 0–0 band of the B{sup ~2}E{sup ′}←X{sup ~2}A{sub 2}{sup ′} transition of the {sup 15}N substituted nitrate radical were observed for the first time, by crossing a jet-cooled molecular beam and a single-mode dye laser beam at right angles. Several thousand rotational lines were detected in the 15 080–15 103 cm{sup −1} region. We observed the Zeeman splitting of intense lines up to 360 G in order to obtain secure rotational assignment. Two, nine, and seven rotational line pairs with 0.0248 cm{sup −1} spacing were assigned to the transitions from the X{sup ~2}A{sub 2}{sup ′} (υ″ = 0, k″ = 0, N″ = 1, J″ = 0.5 and 1.5) to the {sup 2}E{sub 3/2}{sup ′} (J′ = 1.5), {sup 2}E{sub 1/2}{sup ′} (J′ = 0.5), and {sup 2}E{sub 1/2}{sup ′} (J′ = 1.5) levels, respectively, based on the ground state combination differences and the Zeeman splitting patterns. The observed spectrum was complicated due to the vibronic coupling between the bright B{sup ~2}E{sup ′} (υ = 0) state and surrounding dark vibronic states. Some series of rotational lines other than those from the X{sup ~2}A{sub 2}{sup ′} (J = 0.5 and 1.5) levels were also assigned by the ground state combination differences and the observed Zeeman splitting. The rotational branch structures were identified, and the molecular constants of the B{sup ~2}E{sub 1/2}{sup ′} (υ = 0) state were estimated by a deperturbed analysis to be T{sub 0} = 15 098.20(4) cm{sup −1}, B = 0.4282(7) cm{sup −1}, and D{sub J} = 4 × 10{sup −4} cm{sup −1}. In the observed region, both the {sup 2}E{sub 1/2}{sup ′} and {sup 2}E{sub 3/2}{sup ′} spin-orbit components were identified, and the spin-orbit interaction constant of the B{sup ~2}E{sup ′} (υ = 0) state was estimated to be −12 cm{sup −1} as the lower limit.

  19. Synthesis, Central Nervous System Activity and Structure-Activity Relationships of Novel 1-(1-Alkyl-4-aryl-4,5-dihydro-1H-imidazo-3-substituted Urea Derivatives

    Directory of Open Access Journals (Sweden)

    Elżbieta Szacoń

    2015-02-01

    Full Text Available A series of 10 novel urea derivatives has been synthesized and evaluated for their central nervous system activity. Compounds 3a–3h were prepared in the reaction between the respective 1-alkyl-4-aryl-4,5-dihydro-1H-imidazol-2-amines 1a and 1b and appropriate benzyl-, phenethyl-isocyanate or ethyl 4-isocyanatobenzoate and ethyl isocyanatoacetate 2 in dichloromethane. Derivatives 4c and 4g resulted from the conversion of 3c and 3g into the respective amides due to action of an aqueous ammonia solution. The results obtained in this study, based on literature data suggest a possible involvement of serotonin system and/or the opioid system in the effects of tested compounds, and especially in the effect of compound 3h. The best activity of compound 3h may be primarily attributed to its favourable ADMET properties, i.e., higher lipophilicity (related to lower polar surface area and greater molecular surface, volume and mass than for other compounds and good blood-brain permeation. This compound has also the greatest polarizability and ovality. The HOMO and LUMO energies do not seem to be directly related to activity.

  20. Source facies of the Paleozoic petroleum systems in the Tabei uplift, Tarim Basin, NW China: implications from aryl isoprenoids in crude oils

    Energy Technology Data Exchange (ETDEWEB)

    Yongge Sun; Shiping Xu; Hong Lu; Pingxia Cuai [Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou (China). SKLOG

    2003-04-01

    Aryl isoprenoids have been detected for the first time in crude oils from Paleozoic petroleum systems in the Tabei uplift, Tarim Basin, northwestern China. The principal compounds possess the 1-alkyl-2,3,6-trimethyl substitution pattern characteristic of diaromatic carotenoids found in the Chlorobiaceae family of photosynthetic sulfur bacteria, with a predominance of C{sub 13} - C{sub 23} homologues in these samples. Flash pyrolysates of the asphaltene fractions isolated from crude oils show an unusual abundance of 1,2,3,4-tetramethylbenzene, an indicator for a significant contribution of diaromatic carotenoids to the source kerogen of these oils. The wide distribution of these compounds in crude oils reveals that penetration of the photic zone by sulfidic waters during deposition enabled prolific growth of photosynthetic green sulphur bacteria (Chlorobiaceae). This suggests that the source rocks for the Paleozoic petroleum systems in the Tabei uplift were likely deposited under euxinic conditions with sulfate and sulfide-rich water bodies, which doesn't support previously published conclusions of a Middle-Upper Ordovician source that marks the slope facies at the margins of structural uplifts. (author)

  1. Synthesis, in vitro β-glucuronidase inhibitory activity and in silico studies of novel (E)-4-Aryl-2-(2-(pyren-1-ylmethylene)hydrazinyl)thiazoles.

    Science.gov (United States)

    Salar, Uzma; Khan, Khalid Mohammed; Syed, Shazia; Taha, Muhammad; Ali, Farman; Ismail, Nor Hadiani; Perveen, Shahnaz; Wadood, Abdul; Ghufran, Mehreen

    2017-02-01

    Current research is based on the synthesis of novel (E)-4-aryl-2-(2-(pyren-1-ylmethylene)hydrazinyl)thiazole derivatives (3-15) by adopting two steps route. First step was the condensation between the pyrene-1-carbaldehyde (1) with the thiosemicarbazide to afford pyrene-1-thiosemicarbazone intermediate (2). While in second step, cyclization between the intermediate (2) and phenacyl bromide derivatives or 2-bromo ethyl acetate was carried out. Synthetic derivatives were structurally characterized by spectroscopic techniques such as EI-MS, (1)H NMR and (13)C NMR. Stereochemistry of the iminic double bond was confirmed by NOESY analysis. All pure compounds 2-15 were subjected for in vitro β-glucuronidase inhibitory activity. All molecules were exhibited excellent inhibition in the range of IC50=3.10±0.10-40.10±0.90μM and found to be even more potent than the standard d-saccharic acid 1,4-lactone (IC50=48.38±1.05μM). Molecular docking studies were carried out to verify the structure-activity relationship. A good correlation was perceived between the docking study and biological evaluation of active compounds.

  2. Ultrasound-promoted clean synthesis of 1-thiocarbamoyl-3-(2-hydroxyphenyl-5-aryl-4,5-dihydro-1H-pyrazoles

    Directory of Open Access Journals (Sweden)

    Israel Leite Bogarim Jr.

    2012-06-01

    Full Text Available of important biological and pharmaceutical activities. In recent years, we described the synthesis of many heterocycles by non-traditional conditions, such as microwaves and ultrasound. In particular, the beneficial effects of ultrasonic irradiation are playing an increasing role in process chemistry, especially in cases where classical methods require drastic conditions or prolonged reaction times. These observations and our interest in clean production of heterocyclic compounds prompted us to apply ultrasound in the preparation of 1-thiocarbamoyl-3-(2-hydroxyphenyl-5-aryl-4,5-dihydro-1H-pyrazoles. The best condition for preparing the target pyrazoles (5a-c was achieved when two equivalents of both KOH and thiosemicarbazide and 1 equivalent of the chalcones/flavanones (3,4a-c were sonicated for 30 minutes, affording the desired pure product in good yield (Scheme. In conclusion, we have developed a mild, convenient and environmentally friendly protocol for the preparation of target compounds under ultrasonic irradiation. Significant advantages of the method include the fact that: (i the reaction is simple to execute; (ii the products are isolated in good yields (61-76%; (iii the work-up is very simple and (iv the reaction time is short (30 min.

  3. Theoretical evaluation of medicinal properties for some of N-aryl-3-hydroxypyridine-4-ones derivative compounds

    Directory of Open Access Journals (Sweden)

    Mohsen Oftadeh

    2014-02-01

    Full Text Available Nowadays, the bidentate ligands 3-hydroxypyridin-4-ones (HPOs as orally active iron chelating agents have been demonstrated to possess potentials for the treatment of some of the human diseases such as iron-overload in thalassaemia patients and malaria. In this research, a series of HPOs with different substitutes and positions were theoretically investigated in order to extract and predict their partition coefficient values (LogP which were experimentally determined in an aqueous/octanol system. The effective electronic parameters on logP were also investigated. The results show that the type of method, basis set, and the solvent do not basically affect on the logP values. But some parameters such as hydrophobicity, polarizability, and orbital electronic charge density (HOMO and LUMO are effective on logP values.

  4. Facile, regioselective [4 + 2] cycloaddition involving 1-aryl-4-phenyl-1-azadienes and allenic esters: an efficient route to novel substituted 1-aryl-4-phenyl-1,4-dihydropyridines.

    Science.gov (United States)

    Ishar, M P; Kumar, K; Kaur, S; Kumar, S; Girdhar, N K; Sachar, S; Marwaha, A; Kapoor, A

    2001-07-12

    [reaction: see text]1-Aryl-4-phenyl-1-azadienes undergo facile, regioselective [4 + 2] cycloaddition to the C2,C3 pi-bond of allenic esters in refluxing benzene, and the formed adducts undergo a 1,3-H shift to afford novel 2-alkyl-1-aryl-3-ethoxycarbonyl-4-phenyl-1,4-dihydropyridines (78-97%). However, when the reaction is carried at room temperature, besides the [4 + 2] addition, the [2 + 2] mode of addition involving C=N of azadiene and C3,C4 pi-bond of allenic esters also intervenes. The resulting N-aryl-2-ethoxy-carbonyl-methylidene-4-styrylazetidines (17-28%) undergo reorganization on silica gel to afford 2-cyclohexen-1-ones.

  5. Synthesis of 4-Halo-2 ( 5H )-furanones and Their Suzuki-Coupling Reactions with Organoboronic Acids.A General Route to 4-Aryl-2 ( 5 H ) - furanones

    Institute of Scientific and Technical Information of China (English)

    MA,Sheng-Ming(麻生明); SHI,zhang-Jie(施章杰)

    2001-01-01

    4-Halo-2(5H)-furanones were prepared by the halolactoniza-tion of 2,3-allenoic acids.The subsequent Suzuki coupling reaction of 4-halo-2(5H)-furanones with aryl boronic acids was carried out to produce 4-aryl-2(5H).furanones in excellent yields.``

  6. Synthesis of 2,3-epoxy-1-phenyl-3-aryl-1-propanone by combination of phase transfer catalyst and ultrasound irradiation

    Directory of Open Access Journals (Sweden)

    Ji-Tai Li

    2009-03-01

    Full Text Available Seven 2,3-epoxy-1-phenyl-3-aryl-1-propanones were synthesized via epoxidation of thecorresponding 1-phenyl-3-aryl-2-propen-1-ones with 30% aqueous hydrogen peroxide in 74-99% yields usingbenzyldimethyltetradecylammonium chloride as phase transfer catalyst under ultrasound irradiation.

  7. One-pot four-component synthesis of 2-aryl-3,3-dihaloacrylonitriles using potassium hexacyanoferrate(II) as environmentally benign cyanide source

    OpenAIRE

    Zhao,Zhouxing; Li, Zheng

    2011-01-01

    An efficient route to one-pot four-component reactions of aroyl chlorides, potassium hexacyanoferrate(II), triphenylphosphine and carbon tetrahalides to synthesize 2-aryl-3,3-dichloroacrylonitriles and 2-aryl-3,3-dibromoacrylonitriles was described. This protocol has advantages of use of non-toxic cyanide source, high yield and simple work-up procedure.

  8. One-pot four-component synthesis of 2-aryl-3,3-dihaloacrylonitriles using potassium hexacyanoferrate(II) as environmentally benign cyanide source

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, Zhouxing; Li, Zheng, E-mail: lizheng@nwnu.edu.c [Northwest Normal Univ., Lanzhou, Gansu (China). Key Lab. of Polymer Materials of Gansu Province

    2011-07-01

    An efficient route to one-pot four-component reactions of aroyl chlorides, potassium hexacyanoferrate(II), triphenylphosphine and carbon tetrahalides to synthesize 2-aryl-3,3-dichloroacrylonitriles and 2-aryl-3,3-dibromoacrylonitriles was described. This protocol has advantages of use of non-toxic cyanide source, high yield and simple work-up procedure. (author)

  9. Synthesis of o-(dimethylamino)aryl ketones, acridones, acridinium salts, and 1H-indazoles by the reaction of hydrazones and arynes.

    Science.gov (United States)

    Dubrovskiy, Anton V; Larock, Richard C

    2012-12-21

    A novel, efficient route to biologically and pharmaceutically important o-(dimethylamino)aryl ketones, acridones, acridinium salts, and 1H-indazoles has been developed starting from readily available hydrazones of aldehydes and o-(trimethylsilyl)aryl triflates. The reaction proceeds through arynes under mild conditions, tolerates a wide range of functional groups, and provides the final products in good to excellent yields.

  10. Synthesis of N1-Substituted-3-aryl-4-alkyl-4, 5-dihydro-1H-1-pyra- zolethiocarboxamide as Novel Small Molecule Inhibitors of Cysteine Protease of T. cruzi

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    A series of N1-substituted-3-aryl-4-alkyl-4, 5-dihydro-1H-1-pyrazolethiocarboxamide were prepared from the Mannich bases of aryl ketones in good yields. Some derivatives were found to be active against the cysteine protease of T.cruzi..

  11. Application of nano SnO2 as a green and recyclable catalyst for the synthesis of 2-aryl or alkylbenzoxazole derivatives under ambient temperature

    Indian Academy of Sciences (India)

    Seyed Mohammad Vahdat; Shima Ghafouri Raz; Saeed Baghery

    2014-05-01

    Application of nano SnO2 as an efficient and benign catalyst has been explored for the synthesis of 2-aryl or alkylbenzoxazole derivatives via condensation reaction of aldehyde with 2-aminophenol. The reactions proceed under heterogeneous and mild conditions in ethanol at room temperature to provide 2-aryl or alkylbenzoxazoles in high yields.

  12. Phase Transfer Catalyzed Synthesis of 1, 2-Bis[(3-aryl)-s-triazolo-[3, 4-b]-[1, 3, 4]thiadiazole-6-yl]ethanes

    Institute of Scientific and Technical Information of China (English)

    De Jiang LI; He Qing FU

    2006-01-01

    A series of new 1, 2-bis[(3-aryl)-s-triazolo[3, 4-b]-[1, 3, 4]thiadiazole-6-yl]ethanes were synthesized in 50-82% yield by cyclization of 3-aryl-4-amino-5-mercapto-1, 2, 4-triazole with butanedioic acid in the presence of POC13 and tetrabutylammonium iodide as phase transfer catalyst.

  13. Microwave-assisted synthesis of antimicrobial dihydropyridines and tetrahydropyrimidin-2-ones: novel compounds against aspergillosis.

    Science.gov (United States)

    Chhillar, Anil K; Arya, Pragya; Mukherjee, Chandrani; Kumar, Pankaj; Yadav, Yogesh; Sharma, Ajendra K; Yadav, Vibha; Gupta, Jyotsana; Dabur, Rajesh; Jha, Hirday N; Watterson, Arthur C; Parmar, Virinder S; Prasad, Ashok K; Sharma, Gainda L

    2006-02-15

    Ten 4-aryl-1,4-dihydropyridine and three 4-aryl-1,2,3,4-tetrahydropyrimidin-2-one derivatives have been synthesized and examined for their activity against pathogenic strains of Aspergillus fumigatus and Candida albicans. Although none of the three compounds belonging to pyrimidin-2-one series showed any activity against two pathogens, two of the compounds of the dihydropyridine series, that is, diethyl 4-(4-methoxyphenyl)-2,6-dimethyl-1,4-dihydropyridin-3,5-dicarboxylate and dimethyl 4-(4-methoxyphenyl)-2,6-dimethyl-1,4-dihydropyridin-3,5-dicarboxylate, exhibited significant activity against A. fumigatus in disc diffusion, microbroth dilution and percent spore germination inhibition assays. The most active diethyl dihydropyridine derivative exhibited a MIC value of 2.92 microg/disc in disc diffusion and 15.62 microg/ml in microbroth dilution assays. The MIC(90) value of the most active compound by percent germination inhibition assay was found to be 15.62 microg/ml. The diethyl dicarboxylate derivative of dihydropyridine also exhibited appreciable activity against C. albicans. The in vitro toxicity of the most active diethyl dihydropyridine derivative was evaluated using haemolytic assay, in which the compound was found to be non-toxic to human erythrocytes even at a concentration of 625 microg/ml. The standard drug amphotericin B exhibited 100% lysis of erythrocytes at a concentration almost 16 times less than the safer concentration of the most active dihydropyridine derivative.

  14. Synthesis, urease inhibition, antioxidant and antibacterial studies of some 4-amino-5-aryl-3H-1,2,4-triazole-3-thiones and their 3,6-disubstituted 1,2,4-triazolo[3,4-b]1,3,4-thiadiazole derivatives

    Energy Technology Data Exchange (ETDEWEB)

    Hanif, Muhammad; Saleem, Muhammad; Rama, Nasim Hasan, E-mail: nhrama@qau.edu.pk, E-mail: drjamshed@ciit.net.pk [Department of Chemistry, Quaid-i-Azam University, Islamabad (Pakistan); Hussain, Muhammad Tahir [Department of Applied Sciences, National Textile University, Faisalabad (Pakistan); Zaib, Sumera; Aslam, Muhammad Adil M.; Iqbal, Jamshed [Department of Pharmaceutical Sciences, COMSATS Institute of Information Technology, Abbottabad (Pakistan); Jones, Peter G. [Institute for Inorganic and Analytical Chemistry, Technical University of Braunschweig, Braunschweig (Germany)

    2012-05-15

    A new series of 4-amino-5-aryl-3H-1,2,4-triazole-3-thiones, bearing various methoxybenzyl- and methoxyphenethyl groups, was synthesized by refluxing potassium hydrazinecarbodithioate salts in dilute aqueous solution of hydrazine hydrate. These salts were formed by the reaction of acid hydrazides and carbon disulfide in methanolic potassium hydroxide solution at 0-5 deg C. 4-Amino- 5-aryl-3H-1,2,4-triazole-3-thiones were condensed with different substituted aromatic acids to yield 3,6-disubstituted-1,2,4-triazolo[3,4-b]1,3,4-thiadiazoles. The structures of the synthesized compounds were characterized by infrared (IR), {sup 1}H and {sup 13}C nuclear magnetic resonance (NMR), elemental analysis and mass spectrometric (MS) studies. All the synthesized compounds were screened for their urease inhibition, antioxidant and antibacterial activities. Some compounds showed excellent urease inhibition activity, more than the standard drug. Others exhibited potent antioxidant activity. All the compounds showed significant antibacterial activities as compared to the standard drug. (author)

  15. Design, Synthesis, and Validation of an Effective, Reusable Silicon-Based Transfer Agent for Room-Temperature Pd-Catalyzed Cross-Coupling Reactions of Aryl and Heteroaryl Chlorides with Readily Available Aryl Lithium Reagents.

    Science.gov (United States)

    Martinez-Solorio, Dionicio; Melillo, Bruno; Sanchez, Luis; Liang, Yong; Lam, Erwin; Houk, K N; Smith, Amos B

    2016-02-17

    A reusable silicon-based transfer agent (1) has been designed, synthesized, and validated for effective room-temperature palladium-catalyzed cross-coupling reactions (CCRs) of aryl and heteroaryl chlorides with readily accessible aryl lithium reagents. The crystalline, bench-stable siloxane transfer agent (1) is easily prepared via a one-step protocol. Importantly, this "green" CCR protocol circumvents prefunctionalization, isolation of organometallic cross-coupling partners, and/or stoichiometric waste aside from LiCl. DFT calculations support a σ-bond metathesis mechanism during transmetalation and lead to insights on the importance of the CF3 groups.

  16. Aryl-NHC-group 13 trimethyl complexes: structural, stability and bonding insights

    KAUST Repository

    Wu, Melissa M.

    2016-12-14

    Treatment of aromatic N-substituted N-heterocyclic carbenes (NHCs) with trimethyl-gallium and -indium yielded the new Lewis acid-base adducts, IMes·GaMe3 (1), SIMes·GaMe3 (2), IPr·GaMe3 (3), SIPr·GaMe3 (4), IMes·InMe3 (5), SIMes·InMe3 (6), IPr·InMe3 (7), and SIPr·InMe3 (8), with all complexes being identified by X-ray diffraction, IR, and multinuclear NMR analyses. Complex stability was found to be largely dependent on the nature of the constituent NHC ligands. Percent buried volume (%VBur) and topographic steric map analyses were employed to quantify and elucidate the observed trends. Additionally, a detailed bond snapping energy (BSE) decomposition analysis focusing on both steric and orbital interactions of the M-NHC bond (M = Al, Ga and In) has been performed.

  17. Ru(II)-Catalyzed β-Carboline Directed C-H Arylation and Isolation of Its Cycloruthenated Intermediates.

    Science.gov (United States)

    Rajkumar, Subramani; Karthik, Shanmugam; Gandhi, Thirumanavelan

    2015-06-05

    A Ru(II)-catalyzed C-H arylation approach has been developed utilizing β-carboline alkaloids as the directing group. Selective formations of diarylated products from moderate to excellent yields were accomplished. Broad substrate scope with excellent functional group tolerance for C1-phenyl/thienyl/PAHs-β-carbolines was demonstrated. X-ray crystal structure of cycloruthenated complex 2cr and no arylation reaction with model substrate 13 strongly suggests that N2 is the directing group than N9 in C1-aryl-β-carbolines. Catalytic properties and stability of the cycloruthenated complexes have been explored. Library of biologically relevant new β-carboline derivatives and isolation of its cycloruthenated intermediates are the highlights of this work.

  18. Synthesis and characterization of the B3-monomer and hyperbranched poly(aryl ether ketone)s

    Institute of Scientific and Technical Information of China (English)

    Mu Jianxin; Zhang Chunling; Wang Zou; Chen Jie; Jiang Zhenhua

    2006-01-01

    Hyperbranched poly(aryl ether ketone)s were prepared by polymerization of hydroquinone(A2)and 1,3,5-tris[4-(4-fluorobenzoyl)phenoxy]benzene (B3).The gelation of hyperbranched poly(aryl ether ketone)s was effectively avoided.Hydroxyl-terminated(HPAEK-OH)and fluoro-terminated (HPAEK-F) hyperbranched poly(aryl ether ketone)s were prepared by using different A2/B3 mass ratio.The structure of the B3 monomer was confirmed by MS,1H NMR/IR.The glass transition temperatures of the HPAEK-F and HPAEK-OH are 114℃ and 162℃ respectively.Thermal stability of HPAEK-F is higher than HPAEK-OH.

  19. Podophyllum hexandrum Offers Radioprotection by Modulating Free Radical Flux: Role of Aryl-Tetralin Lignans

    Directory of Open Access Journals (Sweden)

    Raman Chawla

    2006-01-01

    Full Text Available We have evaluated the effect of variation in aryl-tetralin lignans on the radioprotective properties of Podophyllum hexandrum. Two fractionated fractions of P. hexandrum [methanolic (S1 and chloroform fractions (S2], with varying aryl-tetralin lignan content were utilized for the present study. The peroxyl ion scavenging potentials of S1 and S2 were found to be comparable [i.e. 45.88% (S1 and 41% (S2] after a 48 h interval in a time-dependent study, whereas in a 2 h study, S2 exhibited significant (P < 0.05 antioxidant activity in different metal ion + flux states. In the aqueous phase, S2 exhibited non-site-specific reactive oxygen species scavenging activity, i.e. 73.12% inhibition at 500 μg ml−1. S1 exhibited 58.40 ± 0.8% inhibition (at 0.025 μg ml−1 of the formation of reactive nitrite radicals, comparable to S2 (52.45 ± 0.825%, and also showed 45.01% site-specific activity (1000 μg ml−1, along with significant (P < 0.05 electron donation potential (50–2000 μg ml−1 compared to S2. Such activities of S1 could be attributed to the significantly (P < 0.05 higher levels of podophyllotoxin β-d-glucopyranoside (16.5 times and demethyl podophyllotoxin glucoside (2.9 times compared with S2. Together, these findings clearly prove that aryl-tetralin lignan content influences the radiation protective potential of the Podophyllum fractions to a great extent.

  20. Facile synthesis of hypercrosslinked resins via chloromethylation and continuous condensation of simple aryl molecules

    Indian Academy of Sciences (India)

    Xiaoyan Zhang; Qiu Jin; Libo Dai; Siguo Yuan

    2011-07-01

    A sort of non-polystyrene type hypercrosslinked resin was firstly synthesized through chloromethylation of simple aryl molecules (benzene, toluene, naphthalene, diphenyl), succedent continuous Friedel–Crafts alkylation polymerization and post-crosslinking reaction. The chemical and porous structures of these novel resins were characterized with BET, FT–IR and elementary analysis, respectively. The results showed that these novel adsorptive materials possessing abundant crosslinked networks had high specific surface areas (up to 1191.26 m2/g), large pore volumes (0.2–1.4 ml/g), narrow pore size distributions (mainly in the range of micropores and small mesopores).