A mild and efficient one pot synthesis of 1,3,4-oxadiazoles from carboxylic acids and acyl hydrazides
作者:Hemaka A. Rajapakse、Hong Zhu、Mary Beth Young、Bryan T. Mott
DOI:10.1016/j.tetlet.2006.05.051
日期:2006.7
A convenient one pot method for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles from acids and acyl hydrazides is reported. Acid activation with CDI, followed by coupling with the desired acylhydrazide and dehydration in the same pot with Ph3P and CBr4 affords the corresponding 1,3,4-oxadiazoles in good yield. The scope of the acid and acylhydrazide components is presented.
据报道,一种方便的一锅法从酸和酰基酰肼合成2,5-二取代的1,3,4-恶二唑。用CDI进行酸活化,然后与所需的酰肼偶联,并在同一罐中用Ph 3 P和CBr 4脱水,得到相应的1,3,4-恶二唑,收率很高。给出了酸和酰肼组分的范围。