Preparation of 5-Substituted 2-Methyl-1,3,4-oxadiazoles from 5-Substituted Tetrazoles and Acetic Anhydride

Abstract
Readily available tetrazoles can be transformed into the corresponding 2-methyl-1,3,4-oxazodiazoles by heating their acetic anhydride solution. The procedure is simple, short, gives high yields, and is applicable to large scale syntheses.