Nie B, Wu W, Ren Q, Wang Z, Zhang J, Zhang Y, Jiang H. Access to Cycloalkeno[
c]-Fused Pyridines via Pd-Catalyzed C(sp
2)-H Activation and Cyclization of
N-Acetyl Hydrazones of Acylcycloalkenes with Vinyl Azides.
Org Lett 2020;
22:7786-7790. [PMID:
32990446 DOI:
10.1021/acs.orglett.0c02466]
[Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A novel Pd(II)-catalyzed vinylic C-H activation and cyclization has been developed, reacting a series of small, medium, and large N-acetyl hydrazones of acylcycloalkenes with vinyl azides to access diverse cycloalkeno[c]-fused pyridine scaffolds. This protocol provides progress in C(sp2)-H bond activation of medium to large cycloalkenes, and the target products can be obtained in a specific regioselectivity with good functional group tolerance and a broad substrate scope.
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