Synthese von Thiazolo[3,2− a]thieno[2,3− d]pyrimidin-Derivaten.

Derivatives of 5 H-thiazolo[3.2− a]thieno[2.3− d]pyrimidine( A), 5 H-[1]benzothieno[2.3− d]thiazolo[3.2− a]pyrimidine ( B), 4 H-thiazolo[3.2− a]thieno[3.2− e]pyrimidine ( C) and 5 H-[1]benzo-thieno[3.2− e]thiazolo[3.2− a]pyrimidine ( D) were synthesized by various methods. Similar reactions are leading to derivatives of thieno[2′.3′∶4.5]pyrimido[2.1− b][1.3]thiazine ( E) and [1]benzothieno[2′.3′∶4.5]pyrimido[2.1− b][1.3]thiazine ( F). C, D, E, and F are new heterocyclic ring systems. Detailed papers will appear soon. [ABSTRACT FROM AUTHOR]