Chen N, Deng TT, Li JQ, Cui XY, Sun WW, Wu B. Hypervalent Iodine(III)-Mediated Umpolung Dialkoxylation of N-Substituted Indoles.
J Org Chem 2022;
87:12759-12771. [PMID:
36170012 DOI:
10.1021/acs.joc.2c01326]
[Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, we report dialkoxylation of N-substituted indoles through a hypervalent iodine-mediated umpolung strategy, affording trans-2,3-dimethoxyindolines with up to 95% yield. In addition, C5-selective bromination of 2,3-dialkoxyindoline via NBS-mediated rearomatization was achieved. DFT calculation of the sequence of electrophilic addition and nucleophilic substitution pathway of N-substituted indoles has also been investigated.
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