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Sample records for 3-dimethylaminobutyl dimethylcarbamate dmabc

  1. Carbamoylcholine analogs as nicotinic acetylcholine receptor agonists--structural modifications of 3-(dimethylamino)butyl dimethylcarbamate (DMABC)

    DEFF Research Database (Denmark)

    Hansen, Camilla Petrycer; Jensen, Anders Asbjørn; Balle, Thomas;

    2009-01-01

    Compounds based on the 3-(dimethylamino)butyl dimethylcarbamate (DMABC) scaffold were synthesized and pharmacologically characterized at the alpha(4)beta(2), alpha(3)beta(4,) alpha(4)beta(4) and alpha(7) neuronal nicotinic acetylcholine receptors (nAChRs). The carbamate functionality and a small...

  2. Exploration of the molecular architecture of the orthosteric binding site in the α4β2 nicotinic acetylcholine receptor with analogs of 3-(dimethylamino)butyl dimethylcarbamate (DMABC) and 1-(pyridin-3-yl)-1,4-diazepane

    DEFF Research Database (Denmark)

    Bach, Tinna Brøbech; Jensen, Anders A.; Petersen, Jette G.;

    2015-01-01

    and protrudes along the interfacial cleft between subunits. To probe these putative extensions in functional nicotinic acetylcholine receptors (nAChRs), elongated analogs of 3-(dimethylamino)butyl dimethylcarbamate (DMABC) and 1-(pyridine-3-yl)-1,4-diazepane were prepared and characterized pharmacologically...

  3. Molecular modeling and anticholinesterasic activity of novel 2-arylaminocyclohexyl N,N-dimethylcarbamates

    Energy Technology Data Exchange (ETDEWEB)

    Bagatin, Mariane C.; Candido, Augusto A.; Basso, Ernani A.; Gauze, Gisele F., E-mail: gfgbandoch@uem.br [Universidade Estadual de Maringa (UEM), PR (Brazil). Departamento de Quimica; Pinheiro, Glaucia M. S.; Hoeehr, Nelci F. [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Faculdade de Ciencias Medicas. Departamento de Patologia Clinica; Machinski Junior, Miguel; Mossini, Simone A.G. [Universidade Estadual de Maringa (UEM), PR (Brazil). Departamento de Ciencias Basicas da Saude

    2013-11-15

    This work reports a detailed theoretical and experimental study of the novel isomer series cis- and trans-2-arylaminocyclohexyl N,N-dimethylcarbamates as potential inhibitors of cholinesterases. In vitro inhibition assay by Ellman's method with human blood samples showed that the new carbamates are selective to the inhibition of enzyme butyrylcholinesterase (BuChE) with maximum inhibition of 90% and IC{sub 50} of 6 and 8 mmol L{sup -1} for the more actives compounds of the series. Molecular modeling studies point to significant differences for the conformations of the compounds in the active sites of enzymes BuChE and acetylcholinesterase (AChE). The results show that the compounds interact more effectively with the active site of enzyme BuChE since the carbamate group is close to the key residues of the catalytic triad. (author)

  4. Solid-phase microextraction for determination of anilino-pyrimidine, dimethylcarbamate and thiadiazine pesticides in irrigation project surface water

    OpenAIRE

    Silva Filho,Clóvis F; Emídio,Elissandro S.; Dórea,Haroldo S.

    2011-01-01

    The objective of this work was to develop a solid-phase microextraction (SPME) technique for the determination of residues of the pyrimethanil, pirimicarb and buprofezin pesticides in surface waters from irrigated areas, with analysis by gas chromatography-mass spectrometry (GC-MS). The optimized method used a 100 µm polydimethylsiloxane (PDMS) fiber, agitation speed of the sample of 900 rpm and pH 7.0. Extraction and desorption times were 30 and 7 min, respectively. Linearity was achieved in...

  5. Tandem amine and ruthenium-catalyzed hydrogenation of CO2 to methanol.

    Science.gov (United States)

    Rezayee, Nomaan M; Huff, Chelsea A; Sanford, Melanie S

    2015-01-28

    This Communication describes the hydrogenation of carbon dioxide to methanol via tandem catalysis with dimethylamine and a homogeneous ruthenium complex. Unlike previous examples with homogeneous catalysts, this CO2-to-CH3OH process proceeds under basic reaction conditions. The dimethylamine is proposed to play a dual role in this system. It reacts directly with CO2 to produce dimethylammonium dimethylcarbamate, and it also intercepts the intermediate formic acid to generate dimethylformamide. With the appropriate selection of catalyst and reaction conditions, >95% conversion of CO2 was achieved to form a mixture of CH3OH and dimethylformamide.

  6. catena-Poly[zinc-tris(μ-dimethylcarbamato-κ2O:O′-zinc-μ-(2-phenylbenzimidazolido-κ2N:N′

    Directory of Open Access Journals (Sweden)

    Mark A. Rodriguez

    2012-01-01

    Full Text Available The crystal structure of the title compound, [Zn2(C13H9N2(C3H6NO23]n, displays a long chiral chain. This is composed of zinc-dimer clusters capped by dimethylcarbamate ligands, which lie on crystallographic twofold rotation axes and are polymerically linked in one dimension by 2-phenylbenzimidadole (2–PBImi organic ligands. The two Zn2+ ions defining the dimetal cluster are crystallographically independent, but display very similar coordination modes and tetrahedral geometry. As such, each Zn2+ ion is coordinated on one side by the N-donor imidazole linker, while the other three available coordination sites are fully occupied by the O atoms from the capping dimethylcarbamates. The chirality of the chain extends along the c axis, generating a rather long 52.470 (11 Å cell axis. Interestingly, the chiral material crystallizes from completely achiral precursors. A twofold axis and 31 screw axis serve to generate the long asymmetric unit.

  7. 3-Oxoisoxazole-2(3H)-carboxamides and isoxazol-3-yl carbamates: Resistance-breaking acetylcholinesterase inhibitors targeting the malaria mosquito, Anopheles gambiae

    Science.gov (United States)

    Verma, Astha; Wong, Dawn M.; Islam, Rafique; Tong, Fan; Ghavami, Maryam; Mutunga, James M.; Slebodnick, Carla; Li, Jianyong; Viayna, Elisabet; Lam, Polo C.-H.; Totrov, Maxim M.; Bloomquist, Jeffrey R.; Carlier, Paul R.

    2015-01-01

    To identify potential selective and resistance-breaking mosquitocides against the African malaria vector Anopheles gambiae, we investigated the acetylcholinesterase (AChE) inhibitory and mosquitocidal properties of isoxazol-3-yl dimethylcarbamates (15), and the corresponding 3-oxoisoxazole-2(3H)-dimethylcarboxamide isomers (14). In both series, compounds were found with excellent contact toxicity to wild-type susceptible (G3) strain and multiply resistant (Akron) strain mosquitoes that carry the G119S resistance mutation of AChE. Compounds possessing good to excellent toxicity to Akron strain mosquitoes inhibit the G119S mutant of An. gambiae AChE (AgAChE) with ki values at least 10- to 600-fold higher than that of propoxur, a compound that does not kill Akron mosquitoes at the highest concentration tested. On average, inactivation of WT AgAChE by dimethylcarboxamides 14 was 10-20 fold faster than that of the corresponding isoxazol-3-yl dimethylcarbamates 15. X-ray crystallography of dimethylcarboxamide 14d provided insight into that reactivity, a finding that may explain the inhibitory power of structurally-related inhibitors of hormone-sensitive lipase. Finally, human/An. gambiae AChE inhibition selectivities of these compounds were low, suggesting the need for additional structural modification. PMID:25684426

  8. Pharmacological characterization of RS-1259, an orally active dual inhibitor of acetylcholinesterase and serotonin transporter, in rodents: possible treatment of Alzheimer's disease.

    Science.gov (United States)

    Abe, Yasuyuki; Aoyagi, Atsushi; Hara, Takao; Abe, Kazumi; Yamazaki, Reina; Kumagae, Yoshihiro; Naruto, Shunji; Koyama, Kazuo; Marumoto, Shinji; Tago, Keiko; Toda, Narihiro; Takami, Kazuko; Yamada, Naho; Ori, Mayuko; Kogen, Hiroshi; Kaneko, Tsugio

    2003-09-01

    A dual inhibitor of acetylcholinesterase (AChE) and serotonin transporter (SERT), RS-1259 (4-[1S)-methylamino-3-(4-nitrophenoxy)]propylphenyl N,N-dimethylcarbamate (fumaric acid)(1/2)salt), was newly synthesized. RS-1259 simultaneously inhibited AChE and SERT in the brain following an oral administration in mice and rats. Actual simultaneous elevation of extracellular levels of 5-HT and ACh in the rat hippocampus was confirmed by microdialysis. The compound was as effective as SERT inhibitors such as fluoxetine and fluvoxamine in a 5-hydroxytryptophan-enhancing test in mice. Spatial memory deficits in the two-platform task of a water maze in aged rats were ameliorated by RS-1259 as well as donepezil. Both RS-1259 and donepezil increased the awake episodes in the daytime electroencephalogram of rats. Although RS-1259 was weaker than donepezil in enhancing central cholinergic transmission, as observed by ACh elevation in the hippocampus and memory enhancement in aged rats, the efficacy of RS-1259 on the consciousness level, which reflects the whole activity in the brain, was almost the same as that of donepezil. These results suggest that both cholinergic and serotonergic systems are involved in maintaining brain arousal and that a dual inhibitor of AChE and SERT may be useful for the treatment of cognitive disorders associated with reduced brain activity such as in Alzheimer's disease.

  9. Nitrogen-rich higher-molecular soil organic compounds patterned by lignin degradation products: Considerations on the nature of soil organic nitrogen

    Science.gov (United States)

    Liebner, Falk; Bertoli, Luca; Pour, Georg; Klinger, Karl; Ragab, Tamer; Rosenau, Thomas

    2016-04-01

    and NMR spectroscopy (1H, 13C, 15N), respectively. The reactions of hydroquinone, methyl hydroquinone and p-benzoquinone with ammonia and dimethyl-ammonium dimethylcarbamate - a source of dimethyl amine - affording the respective (substituted) 2,5-diamino-[1,4]benzoquinones under aerobic conditions have been studied by EPR spectroscopy for both oxygen-free and oxygen-rich conditions. 15N CPMAS NMR and XPS spectra of ammoxidized technical lignins and of ammoxidized low-molecular polyphenolic and quinoid products of the aerobic, microbial lignin degradation using 15N labeled aqueous ammonium hydroxide share many similarities, highly indicative for reaction sequences proceeding via common key intermediates. It has been demonstrated that 2,5-dihydroxy-[1,4]benzoquinone which can be surprisingly formed from both lignin and cellulose reacts with N nucleophiles to the respective 2,5-amino derivatives. The latter are semi-stable and react further to nitrogenous compounds of higher molecular weight. Hydroquinone and methoxy hydroquinone react even faster affording the respective 2,5-diamino-[1,4]benzoquinones. EPR experiments revealed that the reaction of hydroquinone with dimethyl amine proceed via radical intermediates. The results of this study strongly support the polyphenol theory and is hoped to contribute to a better understanding of nitrogen accumulation in soil organic matter. Acknowledgement The financial support by the Austrian Research Promotion Agency FFG (project FLIPPR: Future Lignin and Pulp Processing Research, 836650) and by The Austrian Science Fund FWF (project I154-N19) is gratefully acknowledged.