Metal-Free Synthesis of 1,3,4-Oxadiazoles from N′-(Arylmethyl)hydrazides or 1-(Arylmethyl)-2-(arylmethylene)hydrazines

An efficient and versatile metal-free synthesis of 1,3,4-oxadiazoles from N ′-(arylmethyl)hydrazides or 1-(arylmethyl)-2-(arylmeth­ylene)hydrazines through oxidative dehydrogenation is reported. A range of 2,5-disubstituted 1,3,4-oxadiazoles were prepared by treating N ′-(arylmethyl)hydrazides with (diacetoxyiodo)benzene in acetonitrile or by treating 1-(arylmethyl)-2-(arylmethylene)hydrazines with [bis(trifluoroacetoxy)iodo]benzene in methyl tert -butyl ether. Aldehyde N -acylhydrazones and aldazines were initially generated in situ as intermediates.