Catalytic Synthesis of 3-Methyl-1-phenyl-1H-benzo[g]pyrazolo[3,4-b]quinoline-5,10-dione Derivatives Using Cerium Oxide Nanoparticles as Heterogeneous Catalyst in Green Conditions

Table 1

Synthesis of 3-methyl-1-phenyl-1H-benzo[g]pyrazolo[3,4-b]quinoline-5,10-diones in appropriate times, under reflux conditions and using water as green solvent using cerium oxide nanoparticles (CONPs) catalyst.

Entry	Product	Time (h)	^aYield (%)
1	4a	4	94.5
2	4b	4.5	88
3	4c	5	66
4	4d	6.5	89.5
5	4e	5	93
6	4f	4.5	90.5
7	4g	4.5	93

aIsolated yield.