Wang L, Li M, Ning Z, Zhang X, Fu Y, Du Z. Copper- and Visible-Light-Catalyzed Cascade Radical Cyclization of
N-Propargylindoles with Cyclic Ethers.
J Org Chem 2022;
88:6374-6381. [PMID:
36269585 DOI:
10.1021/acs.joc.2c01713]
[Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient visible-light-assisted, copper-catalyzed tandem radical cyclization of N-propargylindoles with cyclic ethers is established. A series of 2-oxoalkyl-9H-pyrrolo[1,2-a]indol-9-ones with potential biological activities were synthesized in moderate yields by using a dual catalytic system with copper acetate as a transition metal catalyst and eosin Y as a visible light catalyst. The investigation of reaction mechanism shows that it goes through a cascade oxoalkyl radical addition, cyclization, and oxidation process.
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