Pyrazolo[4,3-f]pyrimido[4,5-b]quinoline-8,10-dione derivatives have been synthesized from one-pot condensation of 1-methyl barbituric acid, aromatic aldehydes and 5-aminoindazole utilizing bis[7-tert-butyl-2-anilinotropone] Ti complex in toluene under reflux condition.
Pyrazolo[4,3-f]pyrimido[4,5-b]quinoline-8,10-dione, One-pot, Catalyst.