Synthesis and Biological Evaluation of MAO-A Selective 1,4-Disubstituted-1,2,3,6-tetrahydropyridinyl Substrates
摘要:
Many mammalian tissues express both the A and B forms of monoamine oxidase (MAO), flavoenzymes that catalyze the oxidative deamination of a variety of endogenous and exogenous amines and the ring alpha-carbon oxidative bioactivation of neurotoxic 1,4-disubstituted-1,2,3,6-tetrahydropyridinyl derivatives. Substrates selective for MAO-A that display good kinetic and spectroscopic properties would be of value for developing quantitative assays for MAO-A in tissues that express both the A and B forms of the enzyme. This paper describes the synthesis of several 1-substituted-4-(1-methylpyrrol-2-yl)-1,2,3.6-tetrahydropyridinyl derivatives. Kinetic parameters and MAO-A selectivity indicate that 1-allyl- and 1-propyl-4-(1-methylpyrrol-2-yl)-1,2,3,6-tetrahydropyridine should be good candidates to develop a robust spectrophotometric-based assay that is selective for MAO-A. (C) 2002 Published by Elsevier Science Ltd.
Synthesis and Monoamine Oxidase B Catalyzed Oxidation of C-4 Heteroaromatic Substituted 1,2,3,6-Tetrahydropyridine Derivatives
作者:Sandeep K. Nimkar、Andrea H. Anderson、John M. Rimoldi、Matthew Stanton、Kay P. Castagnoli、Stéphane Mabic、Y.-X. Wang、Neal Castagnoli
DOI:10.1021/tx960063o
日期:1996.1.1
been proposed to proceed via a polar pathway, an initial single-electron transfer pathway and an initial hydrogen atomtransfer pathway. Results from previous studies on selected N-cyclopropyl-4-substituted-1,2,3,6-tetrahydropyridine derivatives have led us to consider a mechanism for these cyclic tertiary allylamines which may not necessarily involve the aminyl radical cation as required by an initial
Chemical model studies on the monoamine oxidase-B catalyzed oxidation of 4-substituted 1-cyclopropyl-1,2,3,6-tetrahydropyridines
作者:Christelle Franot、Stéphane Mabic、Neal Castagnol Jr
DOI:10.1016/s0968-0896(97)10033-5
日期:1998.3
dihydropyridinium products. Although the test compounds also were oxidized rapidly under SET conditions, no evidence for dihydropyridinium product formation was observed. The products that were identified most likely were formed after cyclopropyl ring opening of the initially formed cyclopropylaminyl radical cation. The results are discussed in terms of the mechanism of MAO-B catalysis.
photochemical cross-coupling protocol towards bi(hetero)aryls has been developed. The coupling reactions were mediated by dicyanopyrazine photoredox catalyst, while a photoinduced disproportionation process has been identified as an accompanying mechanism, especially for pyrrole derivatives. The developed method allows the cross-coupling of five-membered rings such as pyrrole, imidazole, thiazole and
Zr-MOF-OH are utilized for photocatalytic arylhalide derivatizations. Phenoxy anions in binaphthol derivatives show high reducing capacity, remarkable activity, good selectivity and fair compatibility towards the activation of arylhalidesthrough a single-electron transfer process under white light irradiation and alkaline conditions. The generated aryl radicals could undergo biaryl cross-coupling