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-Zn Cl-2 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. (C) 1996 John Wiley & Sorts, Inc.