One-pot Fluorination and Organocatalytic
Robinson Annulation for Asymmetric Synthesis of Mono- and Difluorinated Cyclohexenones.
Molecules 2018;
23:molecules23092251. [PMID:
30181479 PMCID:
PMC6225330 DOI:
10.3390/molecules23092251]
[Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 08/29/2018] [Accepted: 08/31/2018] [Indexed: 11/17/2022] Open
Abstract
A one-pot fluorination and organocatalytic Robinson annulation sequence has been developed for asymmetric synthesis of 6-fluoroyclohex-2-en-1-ones and 4,6-difluorocyclohex-2-en-1-ones. The reactions promoted by cinchona alkaloid amine afforded products bearing two or three stereocenters in good to excellent yields with up to 99% ee and 20:1 dr.
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