Table 3: Effect of catalyst loading for the synthesis of 2-substituted-4,6-diarylpyrimidinea.

EntryCatalyst (mol%)Yield (%)

1545
21060
31590
42090

aReaction conditions: chalcone (0.002 mol), SBT (0.0022 mol), heterocyclic secondary amine (0.0024 mol), and ZnO catalyst in DMF (10 mL) at 100°C temperature for 6 h.