Shi Z, Dong S, Liu T, Wang WZ, Li N, Yuan Y, Zhu J, Ye KY. Electrochemical cascade migratory
versus ortho-cyclization of 2-alkynylbenzenesulfonamides.
Chem Sci 2024;
15:2827-2832. [PMID:
38404399 PMCID:
PMC10882495 DOI:
10.1039/d3sc05229j]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 01/10/2024] [Indexed: 02/27/2024] Open
Abstract
Efficient control over several possible reaction pathways of free radicals is the chemical basis of their highly selective transformations. Among various competing reaction pathways, sulfonimidyl radicals generated from the electrolysis of 2-alkynylbenzenesulfonamides undergo cascade migratory or ortho-cyclization cyclization selectively. It is found that the incorporation of an extra 2-methyl substituent biases the selective migration of the acyl- over vinyl-linker of the key spirocyclic cation intermediate and thus serves as an enabling handle to achieve the synthetically interesting yet under-investigated cascade migratory cyclization of spirocyclic cations.
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