Study on DDQ-promoted synthesis of 2,5-disubstituted 1,3,4-oxadiazoles from acid hydrazides and aldehydes
作者:Karolina Jasiak、Agnieszka Kudelko、Wojciech Zieliński、Nikodem Kuźnik
DOI:10.3998/ark.5550190.p009.668
日期:——
A facile stepwise synthesis of 2,5‐disubstituted 1,3,4‐oxadiazoles proceeding via oxidative cyclization of N‐acylhydrazones is reported. The reaction is efficiently promoted by 2,3‐dichloro‐5,6‐dicyano‐1,4‐ benzoquinone (DDQ) to afford the desired products mostly in high yields and in relatively short times. The final 1,3,4‐oxadiazole derivatives are also synthesized directly from acid hydrazides and
据报道,通过 N-酰基腙的氧化环化,可以轻松逐步合成 2,5-二取代的 1,3,4-恶二唑。2,3-二氯-5,6-二氰基-1,4-苯醌(DDQ)可有效促进该反应,以高收率和相对较短的时间提供所需的产物。最终的 1,3,4-恶二唑衍生物也是通过单锅法直接从酰肼和醛合成的。详细讨论了所报告转化的底物范围和局限性。