Aspects of the chemistry of functionalized 1-phenylpyrazoles available from 1,2-diaza-1,3-butadienes and 2-phenylazo-1,3-dicarbonyl compounds

Article abstract of DOI:10.1016/S0040-4039(99)00562-6

In the presence of sodium hydride, treatment of 1,2-diaza-1,3-butadienes with 2-phenylazo-1,3-dicarbonyl compounds gave rise to functionalized 1- phenylpyrazole derivatives in good to excellent yields. Pyrazolo[3,4-d]1,6- dihydropyridazin-6(2H)-one derivatives were obtained by the reaction of 5- methyl-4-methoxycarbonyl-3-acetyl-1-phenylpyrazole with different hydrazines.