Synthesis of 1,2,4-triazolo[4,3-c]-, tetrazolo[1,5-c]-, and 1,2,4-triazino[5,6-c]pyrano[4'3':4,5]pyrrolo-[3,2-e]pyrimidine derivatives

4-Hydrazinopyrano4',3':4,5]pyrrolo2,3-d]pyrimidines served as precursors in the synthesis of new heterocyclic systems, namely, 1,2,4-triazolo4,3-c]-, tetrazolo1,5-c]-, and 1,2,4-triazino5,6-c] pyrano4',3':4,5]-pyrrolo3,2-e]pyrimidines.A. L. Mndzhoyan Institute of Fine Organic Chemistry, National Academy of Sciences of the Republic of Armenia, 375014 Yerevan. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 700-703, May, 1995. Original article submitted January 10, 1995; revision submitted April 20, 1995.