Synthesis of Various Pyrazolo[4′,3′ : 5,6]pyrano[3,2-e] [1,2,4]triazolo[1,5-c]pyrimidines and Pyrazolo[4″,3″ : 5′,6′]pyrano[2′,3′ : 4,5]pyrimido[1,6-b] [1,2,4]triazines

Abstract

A number of heterocyclic compounds 5-13 were prepared by the reaction of 6-amino-1,4,5,6-tetrahydro-5-imino-3-methyl-1,4-diphenylpyrazolo [4′,3′:5,6]pyrano[2,3-d]pyrimidine (3) with ethyl 2-cyano-3-ethoxy-2-propenoate, ethoxymethylenemalononitrile, ethyl cyanoacetate, malononitrile, ethyl pyruvate, oxalyl chloride, ethyl chloroformate, and 3-methyl-4-nitroso-1-phenylpyrazol-5(4H)-one, respectively.