Studies on Heterocyclic Compounds. XIII. Reaction of 2-Amino-benzazoles with Acetylenic Compounds

Abstract

Reaction of 2-aminobenzazoles such as 2-amino-benzothiazole, -benzoxazole, and-benzimidazole with acetylene compounds was reported comparing with the condensation product of these benzazoles and ethoxy methylenemalonate. In the former case, 2-oxo compounds were obtained while 4-oxo compounds were the product in the latter condensation. The structure of these products was confirmed from nuclear magnetic resonance and mass spectra.