Characterization of an unexpected product from a monoamine oxidase B generated 2,3-dihydropyridinium species
摘要:
This report summarizes the unexpected properties of the 2,3-dihydropyridinium species generated by the monoamine oxidase B catalyzed oxidation of 4-(benzoyloxy)-l-methyl-1,2,3,6-tetrahydropyridine, an analog of the neurotoxic 4-phenyltetrahydropyridine derivative. Unlike the corresponding 4-aryloxy and 4-carbamoyloxy derivatives which undergo rapid hydrolytic cleavage via a 1,4-addition of water, the benzoyloxy metabolite undergoes a 1,2-addition reaction to yield a carbinolamine that subsequently rearranges to a beta-keto aldehyde that was characterized as the corresponding pyrazole. From these results it appears that, under physiological conditions, 2,3-dihydropyridinium species in general may exist in equilibrium with the corresponding carbinolamines and ring-opened amino aldehydes, species which may be of importance in understanding the chemical and biological properties of these heterocyclic systems.
Characterization of an unexpected product from a monoamine oxidase B generated 2,3-dihydropyridinium species
作者:Deepak Dalvie、Zhiyang Zhao、Neal Castagnoli
DOI:10.1021/jo00052a056
日期:1992.12
This report summarizes the unexpected properties of the 2,3-dihydropyridinium species generated by the monoamine oxidase B catalyzed oxidation of 4-(benzoyloxy)-l-methyl-1,2,3,6-tetrahydropyridine, an analog of the neurotoxic 4-phenyltetrahydropyridine derivative. Unlike the corresponding 4-aryloxy and 4-carbamoyloxy derivatives which undergo rapid hydrolytic cleavage via a 1,4-addition of water, the benzoyloxy metabolite undergoes a 1,2-addition reaction to yield a carbinolamine that subsequently rearranges to a beta-keto aldehyde that was characterized as the corresponding pyrazole. From these results it appears that, under physiological conditions, 2,3-dihydropyridinium species in general may exist in equilibrium with the corresponding carbinolamines and ring-opened amino aldehydes, species which may be of importance in understanding the chemical and biological properties of these heterocyclic systems.
Synthesis of Linear Enamides and Enecarbamates
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Photoredox Acceptorless Dehydrogenation
作者:Ritu、Daniel Kolb、Nidhi Jain、Burkhard König
DOI:10.1002/adsc.202201259
日期:2023.2.21
decatungstate (TBADT) as hydrogen atom transfer (HAT) agent and a cobaloxime co-catalyst for dihydrogen evolution for the dehydrogenative preparation of linear enamides and enecarbamates from saturated precursors. The substrate scope includes several natural products and drug derivatives. The reaction does not require noble metal catalysts, exhibits short reaction times compared to previous methods and is suitable