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 4

The synthesis of 3-methyl-1,4-diphenyl-1H-benzo[g]pyrazolo[3,4-b]quinoline-5,10-dione (4a) in the presence of reused cerium oxide nanoparticles (CONPs) under reflux conditions.

Entry	^aYield (%)
1	94.4
2	92
3	88
4	87.5

aIsolated yield.