Synthesis of new pyrazolo[4,3-e]-1,2,4-triazolo[1,5-c]pyrimidines and related heterocycles

Abstract

The reaction between 5-amino-4-imino-1(2)-substituted-1(2)H-4,5-dihydropyrazolo[3,4-d]pyrimidines, e.g. I, and several com. available reactants afforded new heterocycles with a conserved pyrazolo[3,4-d]pyrimidine nucleus, e.g. II. The key intermediates employed proved to be suitable compds. by virtue of their two vicinal amino and imino groups that were used to obtain five, six and seven-membered rings