Ring Transformations of 2-(2-Oxopropyl-, 2-oxo-2-phenylethylthio) Oxazolo[4,5-b]pyridine in the Reaction with N-containing Nucleophiles

Abstract

2,3-Dihydro-2-(3-hydroxy-2-piridylimino)-thiazoles 7, 9a-f and 11 are synthesized by ring transformation of 2-(2-oxo-propylthio)oxazolo[4,5-b] pyridine (2) and 2-(2-oxo-2-phenylethylthio) oxazolo-[4,5-b]pyridine (3) in reactions with amines, hydrazine or ammonium acetate.