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Effect of solvent for the synthesis of 2-substituted-4,6-diarylpyrimidinea.
| Entry | Solvent | Yield (%) |
|---|---|---|
| 1 | None | 20 |
| 2 | H2O | 30 |
| 3 | NMP | 68 |
| 4 | DMSO | 75 |
| 5 | DMF | 90 |
aReaction conditions: chalcone (0.002 mol), SBT (0.0022 mol), heterocyclic secondary amine (0.0024 mol), and ZnO catalyst (15 mol%) in DMF (10 mL) at 100°C temperature for 6 h.
