Visible-Light-Driven Palladium-Catalyzed Oxy-Alkylation of 2-(1-Arylvinyl)anilines by Unactivated Alkyl Bromides and CO2 : Multicomponent Reactions toward 1,4-Dihydro-2H -3,1-benzoxazin-2-ones

Organic Letters
Song SunJiang Cheng

Abstract

A visible-light-driven palladium-catalyzed radical oxy-alkylation of 2-(1-arylvinyl)anilines with unactivated alkyl bromides and CO2 has been developed toward 1,4-dihydro-2H-3,1-benzoxazin-2-ones. This multicomponent reaction (MCR) starts with (1) carboxylation of an amino by CO2; (2) formation of Pd(I) and an alkyl radical via visible-light-driven reaction of alkyl bromides and Pd(0); (3) addition of an alkyl radical to the vinyl followed by single electron transfer (SET) oxidation to the carbocation by Pd(I); and (4) cyclization via intramolecular nucleophilic attack of the carboxylate anion to carbocation.

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Citations

Sep 24, 2020·Organic & Biomolecular Chemistry·Ting-Kai XiongYing Liang

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