2-amino-3,5-dicyano-4, 6-diphenyl-4-H-pyran (Ill) was synthesized via the action of malononitrile on a-cyanoketone I. Compound III reacted with acetic anhydride to yield the pyrano-pyrimidine derivative VI. 3,5-Dicyano-2,4,6-triphenyl-pyridine (X)
was the only isolable product on treatment of III with formamide. On the other hand, the pyrano-12,3:5',6']-pyrazolo pyrimidine derivative XII could be obtained when III was treated with 5-amino-3-methyl-4-phenylpyrazole.