Synthesen von basisch substituierten ([1]Benzo-)Thieno-[2,3- d]pyrimidin-Derivaten und von ([1]Benzo-)Thieno-[2,3- d]-1,2,4-triazolo[4,3- a]pyrimidin-Derivaten.

Reaction of 2-methylthio-thieno[2.3- d]pyrimidin-4(3 H)-ones with heterocyclic secondary amines, ethanolamine and hydrazine, resp., gave the corresponding derivatives with a basic substituent in position 2. Cyclization of the hydrazino compounds with formic acid gave derivatives of thieno[2.3- d]-1.2.4-triazolo[4.3- a]pyrimidine and [1]benzothieno[2.3- d]-1.2.4-triazolo[4.3- a]pyrimidine, two new heterocyclic systems. [ABSTRACT FROM AUTHOR]