Oh H, Kim H, Kim I. Regioselective Access to 1,2,4-Triazole-Fused
N-Heterocycle, Pyrrolo[1,2-
a][1,2,4]triazolo[5,1-
c]pyrazine, via Double Dehydrative Cyclizations.
J Org Chem 2023;
88:11748-11761. [PMID:
37526505 DOI:
10.1021/acs.joc.3c01044]
[Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
A highly efficient and regioselective approach to a novel 1,2,4-triazole-fused N-heterocyclic scaffold, pyrrolo[1,2-a][1,2,4]triazolo[3,4-c]pyrazine, was established by base-promoted reaction of pyrrole-2-carbonitrile-derived substrate with acyl hydrazide where domino double ring closures comprised of enamine formation, attack on nitrile, and cyclodehydration enabled sequential construction of pyrazine and 1,2,4-triazole ring systems with formation of three C-N bonds.
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