Matsuzaki H, Takeda N, Yasui M, Okazaki M, Suzuki S, Ueda M. Synthesis of multi-substituted 1,2,4-triazoles utilising the ambiphilic reactivity of hydrazones.
Chem Commun (Camb) 2021;
57:12187-12190. [PMID:
34730140 DOI:
10.1039/d1cc05326d]
[Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The synthesis of N-alkyl-1H-1,2,4-triazoles from N,N-dialkylhydrazones and nitriles via formal [3+2] cycloaddition including the C-chlorination/nucleophilic addition/cyclisation/dealkylation sequence was developed. This sequential reaction utilising the in situ generation of hydrazonoyl chloride based on the ambiphilic reactivity of hydrazones afforded a variety of multi-substituted N-alkyl-triazoles in high yields. The synthetic utility of multi-substituted triazoles was also demonstrated by further transformations.
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