A convenient and mild method for 1,2,4-oxadiazole preparation: cyclodehydration of O -acylamidoximes in the superbase system MOH/DMSO
作者:Sergey Baykov、Tatyana Sharonova、Angelina Osipyan、Sergey Rozhkov、Anton Shetnev、Alexey Smirnov
DOI:10.1016/j.tetlet.2016.05.071
日期:2016.6
Herein, we reported a general, convenient, and efficient synthesis of 3,5-disubstituted-1,2,4-oxadiazoles via cyclodehydration of O-acylamidoximes in the superbase system MOH/DMSO (M = Li, Na, K). Excellent isolated yields (up to 98%) were attained within short reaction times (10–20 min). In addition, mild reaction conditions and a simple work-up procedure allow the synthesis of a wide range of heat-labile
在本文中,我们报道了在超碱系统MOH / DMSO(M = Li,Na,K)中通过O-酰基酰胺基肟的环脱水作用,一种一般,便捷,有效的合成3,5-二取代-1,2,4-恶二唑的方法。在较短的反应时间内(10-20分钟)即可获得出色的分离产率(高达98%)。此外,温和的反应条件和简单的后处理程序可以合成多种热不稳定的含1,2,4-恶二唑的物质。