Liu D, Zhao Y, Patureau FW. NaI/PPh
3-catalyzed visible-light-mediated decarboxylative radical cascade cyclization of
N-arylacrylamides for the efficient synthesis of quaternary oxindoles.
Beilstein J Org Chem 2023;
19:57-65. [PMID:
36741816 PMCID:
PMC9874234 DOI:
10.3762/bjoc.19.5]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 12/08/2022] [Indexed: 01/18/2023] Open
Abstract
A practical NaI/PPh3-catalyzed decarboxylative radical cascade cyclization of N-arylacrylamides with redox-active esters is described, which is mediated by visible light irradiation. A wide range of substrates bearing different substituents and derived from ubiquitous carboxylic acids, including α-amino acids, were synthesized and examined under this very mild, efficient, and cost effective transition-metal-free synthetic method. These afforded various functionalized oxindoles featuring a C3 quaternary stereogenic center. Mechanistic experiments suggest a radical mechanism.
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