Synthesis 2015; 47(07): 1032-1040
DOI: 10.1055/s-0034-1379974
paper
© Georg Thieme Verlag Stuttgart · New York

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

Zhenhua Shang*
a   College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Hebei Research Center of Pharmaceutical and Chemical Engineering, Shijiazhuang 050018, P. R. of China, Email: shangzhenhua@hebust.edu.cn
b   State Key Laboratory Breeding Base, Hebei Province Key Laboratory of Molecular Chemistry for Drugs, Shijiazhuang 050018, P. R. of China
,
Qianqian Chu
a   College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Hebei Research Center of Pharmaceutical and Chemical Engineering, Shijiazhuang 050018, P. R. of China, Email: shangzhenhua@hebust.edu.cn
,
Sheng Tan*
c   Shijiazhuang Chemical Engineering Institute, Shijiazhuang 050000, P. R. of China   Email: tanshen1973@126.com
› Author Affiliations
Further Information

Publication History

Received 03 September 2014

Accepted after revision: 11 December 2014

Publication Date:
02 February 2015 (online)


Abstract

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.

Supporting Information