Takahashi K, Geib SJ, Maeda K, Curran DP, Taniguchi T. Radical
trans-Hydroboration of Substituted 1,3-Diynes with an
N-Heterocyclic Carbene Borane.
Org Lett 2021;
23:1071-1075. [PMID:
33481616 DOI:
10.1021/acs.orglett.0c04284]
[Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Monohydroboration of substituted 1,3-diynes with an N-heterocyclic carbene borane (NHC-borane) occurs under radical conditions using an azo initiator, such as ACCN and AIBN, and a thiol as a polarity-reversal catalyst. The reaction is highly regio- and stereoselective and provides stable NHC-(E)-alkynylalkenylboranes.
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