Dérivés de l'imidazo[2,1–b] thiazole. IV. Réarrangements au cours de la condensation de β-dicétones α-bromées avec l'amino-2 thiazole et la mercapto-2 imidazoline

Formation of 2-acetyl- (ro benzoyl-) imino-3-acetonyl- (or phenacyl-)-thiazolines and l-acetyl- (or benzoyl-)-2-acetonyl- (or phenacy l)-thioimidazolines by the action of α-halogenated β-di-ketones on 2-aminothiazole and 2-mercaptoimidazoline has been observed. These compounds resulted by nucleophilic attack followed by rearrangement and then cleavage of the intermediate carbinolamine. A dissymmetrical βdiketone rearranged unequivocally.