Beltran F, Fabre I, Ciofini I, Miesch L. Direct Spirocyclization from Keto-sulfonamides: An Approach to Azaspiro Compounds.
Org Lett 2017;
19:5042-5045. [PMID:
28929765 DOI:
10.1021/acs.orglett.7b02216]
[Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Spontaneous spirocyclization of keto-sulfonamides via ynamides through a one-pot process is presented. Push-pull ynamides were obtained through Michael addition/elimination without Cu. The obtained azaspiro compounds are building blocks for indole alkaloids. Theoretical studies provide insights into the mechanism of the formal Conia-ene reaction.
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