IBD-mediated oxidative cyclization of pyrimidinylhydrazones and concurrent Dimroth rearrangement: Synthesis of [1,2,4]triazolo[1,5-<i>c</i>]pyrimidine derivatives
作者:Caifei Tang、Zhiming Li、Quanrui Wang
DOI:10.3762/bjoc.9.298
日期:——
Oxidative cyclization of 6-chloro-4-pyrimidinylhydrazones 4 with iodobenzene diacetate (IBD) in dichloromethane gives rise to [1,2,4]triazolo[4,3-c]pyrimidine derivatives 5a-o. These incipient products undergo feasible Dimroth rearrangement to furnish the isolated [1,2,4]triazolo[1,5-c]pyrimidines 6a-o in moderate to high yields.
6-氯-4-嘧啶基腙 4 与二乙酸碘苯 (IBD) 在二氯甲烷中的氧化环化产生 [1,2,4] 三唑并 [4,3-c] 嘧啶衍生物 5a-o。这些初始产物经过可行的 Dimroth 重排,以中等至高产率提供分离的 [1,2,4] 三唑并 [1,5-c] 嘧啶 6a-o。