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
One pot direct synthesis of oxazolines, benzoxazoles, and oxadiazoles from carboxylic acids using the Deoxo-Fluor reagent
作者:Cyrous O. Kangani、David E. Kelley、Billy W. Day
DOI:10.1016/j.tetlet.2006.07.032
日期:2006.9
A one-pot, high yield direct synthesis of various 2-substituted oxazolines, benzoxazoles, and 2-oxadiazoles from carboxylic acids using Deoxo-Fluor reagent is described. (c) 2006 Elsevier Ltd. All rights reserved.