Reactions with 6-amino-5-cyano-3-methyl-1,4-diphenyl-1H,4H-pyrano[2,3-c]-pyrazole - A novel synthesis of 4-arylidene-3-methyl-1-phenyl-2-pyrazolin-5-one derivatives

Treating of 6-amino-5-cyano-3-methyl-1,4-diphenyl-1H,4H-pyrano[2,3-c] pyraz ole with aromatic aldehyde yielding the corresponding 4-arylidene-3-methyl- 1-phenyl-2-pyrazolin-5-ones, with formamide gives trispyrazolone derivative . Other reactions were discussed.