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Examining; optimum reaction conditions.
| ||||
|---|---|---|---|---|
| Entry | Solvent | Temp. (˚C) | Time (h) | Yield (%)b |
| 1 | Ethanol (4 mL) | r.t. | 48 | - |
| 2 | Ethanol (4 mL) | 70 | 4 | 90 |
| 3 | Ethanol (4 mL) | 80 | 4 | 90 |
| 4 | Acetonitrile (4 mL) | 70 | 12 | 45 |
| 5 | Methanol (4 mL) | 70 | 8 | 33 |
| 6 | Water (4 mL) | 70 | 8 | 52 |
| 7 | Water/ethanol (4 mL) | 70 | 5 | 60 |
| 8 | Tetrahydrofuran(4 mL) | 70 | 12 | 30 |
