Byun Y, Moon J, An W, Mishra NK, Kim HS, Ghosh P, Kim IS. Transition-Metal-Free Alkylation and Acylation of Benzoxazinones with 1,4-Dihydropyridines.
J Org Chem 2021;
86:12247-12256. [PMID:
34406002 DOI:
10.1021/acs.joc.1c01558]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The direct functionalization of N-heterocycles is a vital transformation for the development of pharmaceuticals, functional materials, and other chemical entities. Herein, the transition-metal-free alkylation and acylation of C(sp2)-H bonds in biologically relevant 2-benzoxazinones with 1,4-dihydropyridines as readily accessible radical surrogates is described. Excellent functional group compatibility and a broad substrate scope were attained. Gram-scale reaction and transformations of the synthesized adducts via Suzuki coupling with heteroaryl boronic acids demonstrated the synthetic potential of the developed protocol.
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