Monoamine oxidase B-catalyzed reactions of cis- and trans-5-aminomethyl- 3-(4-methoxyphenyl)dihydrofuran-2(3H)-ones. Evidence for a reversible redox reaction

Xingliang Lu, Richard B Silverman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Monoamine oxidase B (MAO B) was previously shown to catalyze the decarboxylation of cis- (1) and trans-5-(aminomethyl)-3-(4- methoxyphenyl)dihydrofuran-2(3H)-one hydrochloride (2) (Silverman, R. B.; Zhou, J. J. P.; Ding, C. Z.; Lu, X. J. Am. Chem. Soc. 1995, 117, 12895- 12896). By [14C]-labeling of the aryl methoxyl group, it is now shown that the decarboxylated product is 4-(4-methoxyphenyl)-butanal (7), which is in the same oxidation state as the substrate. Two other products are produced, 4-carboxy-4-(4-methoxyphenyl)butanal (8), and 5-formyl-3-(4- methoxyphenyl)dihydrofuran-2(3H)-one (9). Only 9 is an oxidation product; 7 and 8 are in the same oxidation state as the substrate (1 or 2). No products are detected under strictly anaerobic conditions. All of these products can be rationalized as arising from the formation of an α-carbon radical, generated either by single-electron amine oxidation and loss of a proton or direct hydrogen atom abstraction to 10 (Scheme 5). This intermediate then can undergo second electron oxidation and hydrolysis of the iminium ion to give 9 (the normal oxidation product). However, it also can suffer either homolytic C-O bond cleavage, decarboxylation, and electron return from the active site to give 7 or heterolytic cleavage and electron return from the active site to give 8. 5-(4-Methoxyphenyl)tetrahydrofuran-2-ol (14), an oxidation product from the intermediate that leads to 7, is not detected. These results suggest that MAO B can catalyze reversible redox reactions.

Original languageEnglish (US)
Pages (from-to)10583-10587
Number of pages5
JournalJournal of the American Chemical Society
Volume120
Issue number41
DOIs
StatePublished - Oct 21 1998

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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