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Derivatives of a new heterocyclic system, viz. pyrazolo(4,3-e)(1,2,4)triazolo(1,5-c)pyrimidine 5, have been synthesized by coupling imidoesters of 1-substituted-5-aminocarbonitriles 2 with acylhydrazides. The thermal recyclization of 1-substituted-4-(2-acylhydrazin-1-yl)pyrazolo(3,4- d)-pyrimidines 7 is found to be an alternative approach to the heterocyclic system 5.

Two approaches to a new heterocyclic system of pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidine