Kikuchi J, Nakajima R, Yoshikai N. Three-component
N-alkenylation of azoles with alkynes and iodine(III) electrophile: synthesis of multisubstituted
N-vinylazoles.
Beilstein J Org Chem 2024;
20:891-897. [PMID:
38711595 PMCID:
PMC11070964 DOI:
10.3762/bjoc.20.79]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 04/11/2024] [Indexed: 05/08/2024] Open
Abstract
A stereoselective N-alkenylation of azoles with alkynes and iodine(III) electrophile is reported. The reaction between various azoles and internal alkynes is mediated by benziodoxole triflate as the electrophile in a trans-fashion, affording azole-bearing vinylbenziodoxoles in moderate to good yields. The tolerable azole nuclei include pyrazole, indazole, 1,2,3-triazole, benzotriazole, and tetrazole. The iodanyl group in the product can be leveraged as a versatile synthetic handle, allowing for the preparation of hitherto inaccessible types of densely functionalized N-vinylazoles.
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