Lei G, Zhang H, Chen B, Xu M, Zhang G. Copper-catalyzed enantioselective arylalkynylation of alkenes.
Chem Sci 2020;
11:1623-1628. [PMID:
32206280 PMCID:
PMC7069229 DOI:
10.1039/c9sc04029c]
[Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 11/26/2019] [Indexed: 12/15/2022] Open
Abstract
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Enantioselective aryl and alkynylation of activated/nonactivated alkenes.
A copper-catalyzed enantioselective arylalkynylation of alkenes with diaryliodonium salt and a monosubstituted alkyne is reported. The three-component coupling reactions proceed under mild reaction conditions with a broad substrate scope, leading to synthetically valuable 1,2-diaryl-3-butynes. The key to the success of this chemistry is the employment of the chiral bisoxazoline-phenylaniline (BOPA) ligand. A novel reaction pathway involving the phenyl radical generation under thermal copper catalysis is proposed according to mechanistic studies.
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