Formal [4+1] cyclization of (thio/imido)hydrazides and ethyl 3,3,3-trifluoropropanoate: unified synthesis of 1,3,4-oxadiazoles, 1,3,4-thiadiazoles and 1,2,4-triazoles
作者:Lan Zhao、Jun Xu、Jun Ma、Guangwei Yin、Fangyi Li、Tongchuan Suo、Chunhua Wang
DOI:10.1039/d2nj04147b
日期:——
Here we report an efficient and practical one-step synthesis of a series of 1,3,4-oxadiazoles with ethyl ester decoration, which was accomplished by the formal [4+1] cyclization of hydrazides and commercially available ethyl 3,3,3-trifluoropropanoate. In contrast to previously reported synthetic processes, this method features operational simplicity, easy scalability and good substrate tolerability
在这里,我们报告了一系列具有乙酯修饰的 1,3,4-恶二唑的有效且实用的一步合成,这是通过酰肼和市售乙基 3,3,3 的正式 [4+1] 环化完成的。 -三氟丙酸酯。与先前报道的合成工艺相比,该方法具有操作简单、易于扩展和良好的底物耐受性。此外,本合成方法可以推广到获得 1,3,4-噻二唑和 1,2,4-三唑。