Studies with polyfunctionally substituted heteroaromatics: 2-Phenyl-4-p-tolylhydrazono-2-oxazoline-5-one as a precursor for the synthesis of substituted 1,2,4-triazoles and pyridines

2-Phenyl-4-p-tolylhydrazono-2-oxazoline-5-one ( 3 ) was rearranged by the action of phenols and naphthols into 1,2,4-triazole-5-carboxylic esters ( 5 ) that were rearranged further on reflux in AcOH-ZnCl₂ into triazolyl ketones ( 7 ). Rearrangement of 3 into 1,2,4-triazole derivatives could also be effected by the action of heterocyclic amines and 1-naphthylamine. © John Wiley & Sons, Inc.