rboxylates with hydrazine hydrate produced hydrazides which were acylated with benzoyl or 2-furoyl chloride and then subjected to heterocyclization to obtain furan derivatives containing a 1,3,4-oxadiazolering. The target products were also synthesized in one step by reacting 5-aminomethylfuran-2-carbohydrazides with acid chlorides in the presence of phosphoryl chloride.