Optimization of solvent by DES (0.5 g), in 10 min.
| Entry | Temp. (°C) | Solvent | Yield (%) |
|---|---|---|---|
| 1 | Reflux | Ethanol | 50 |
| 2 | Reflux | Water | 10 |
| 4 | Reflux | Ethyl acetate | 33 |
| 5 | Reflux | n-Hexane | — |
| 6 | 80 | Solvent free | 92 |
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