Tang CK, Feng KX, Xia AB, Li C, Zheng YY, Xu ZY, Xu DQ. Asymmetric synthesis of polysubstituted chiral chromans
via an organocatalytic oxa-Michael-nitro-Michael domino reaction.
RSC Adv 2018;
8:3095-3098. [PMID:
35541173 PMCID:
PMC9077565 DOI:
10.1039/c7ra13525d]
[Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 12/28/2017] [Indexed: 11/21/2022] Open
Abstract
A catalytic asymmetric method for the synthesis of polysubstituted chromans via an oxa-Michael-nitro-Michael reaction has been developed. The squaramide-catalyzed domino reaction of 2-hydroxynitrostyrenes with trans-β-nitroolefins produced chiral chromans with excellent enantioselectivities (up to 99% ee), diastereoselectivities (up to >20 : 1 dr), and moderate to good yields (up to 82%).
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