ZnO Catalyzed Efficient Synthesis of Some New 2-Substituted-4,6-diarylpyrimidines

Table 3

Effect of catalyst loading for the synthesis of 2-substituted-4,6-diarylpyrimidine^a.

Entry	Catalyst (mol%)	Yield (%)
1	5	45
2	10	60
3	15	90
4	20	90

^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.