Vk. Ahluwalia et al., REACTION OF 5-AMINO-4-FORMYL-3-METHYL(OR PHENYL)-1-PHENYL-1H-PYRAZOLES WITH ACTIVE METHYLENE-COMPOUNDS - SYNTHESIS OF FUSED HETEROCYCLIC RINGS, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 36(1), 1997, pp. 88-90
A convenient one-pot synthesis of fused heterocyclic ring systems, pyr
azolo[3',4':5,6]pyrido[2,3-d]pyrimidines 3a-d, dipyrazolopyridines 4a-
b, pyrazolo[3,4-b]quinolines 5a-b and 6a-b and pyrazolo[3,4-b]pyridine
s 7a-b, has been achieved by condensation of 5-amino-4-formyl-3-methyl
(or phenyl)-1-phenyl-1H-pyrazoles 2a-b with ,3-diaryl-4,6-dioxo-2-thio
xo-hexahydropyrimidines, 3-methyl-1-phenyl-1H-2-pyrazolin-5-one, dimed
one,cyclohexanone and 3-acetylpyridine, respectively.