Synthesis of 2,4-Diamino-5-Cinnamoylthiazoles and Their Attempted Cyclization

Abstract

Synthesis of 4-amino-2-aryl(or alkyl)amino-5-cinnamoylthiazoles by a [(C ─ N ─ C ─ S) + C] ring construction route is reported. Unlike the analogous 2′-aminochalcones, neither do these thiazoles cyclize to bicyclic pyridones, nor could these be prepared from the corresponding 5-acetylthiazoles and benzaldehyde.