Leypold M, D’Angelo KA, Movassaghi M. Chemoselective α-Sulfidation of Amides Using Sulfoxide Reagents.
Org Lett 2020;
22:8802-8807. [PMID:
33048547 PMCID:
PMC7680396 DOI:
10.1021/acs.orglett.0c03160]
[Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Indexed: 11/29/2022]
Abstract
The direct α-sulfidation of tertiary amides using sulfoxide reagents under electrophilic amide activation conditions is described. Employing convenient and readily available reagents, selective functionalization takes place to generate isolable sulfonium ions en route to α-sulfide amides. Mechanistic studies identified activated sulfoxides as promoters of the desired transformation and enabled the extension of the methodology from benzylic to aliphatic amide substrates.
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