Synthesis of new derivatives of pyrazolo[4,3-e][1,2,4]triazolo[4,3-c]pyrimidine Seddigheh Sheikhi-Mohammareh, Ali Shiri and Mehdi Bakavoli

A number of new derivatives of pyrazolo[4,3-e][1,2,4]triazolo[4,3-c]pyrimidine have been synthesised by cyclocondensation of several hydrazino derivatives of pyrazolo[3,4-d]pyrimidine with either orthoesters or carbon disulfide in pyridine followed by alkylation to obtain the desired products. The structures of all the newly synthesised products have been thoroughly elucidated.