Vk. Ahluwalia et al., A FACILE SYNTHESIS OF 3,5-DIALKYL L-1H,4H,7H,8H-DIPYRAZOLO-[3,4-B/4',3'-E]PYRIDINES/, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 36(11), 1997, pp. 1059-1061
3,5-Dialkyl/diaryl-4-aryl-8-(4-methylphenyl)-1,7- diphenyl-1H, 4H, 7H,
8H-dipyrazolo [3,4-b:4',3'-e]pyridines 4 a-i have been synthesized by
the reaction of 3-alkyl/aryl-1-phenyl- 4,5-dihydropyrazolin-5-ones I
a-c with p-toluidine 2 and aromatic aldehydes 3 a-c in methanol.