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| Entry | Catalyst | Condition | Time (min) | Yield (%) | Ref. |
|---|---|---|---|---|---|
| 1 | CTSA | Solvent free/90 °C | 32 | 86 | 35 |
| 2 | MPS | MeOH + H2O/rt | 300 | 86.5 | 33 |
| 3 | K5CoW12O40·3H2O | 140 °C | 120 | 88.6 | 38 |
| 4 | SBPPSA | Solvent free/140 °C | 60 | 90 | 39 |
| 5 | MCM-41 | AcOH/reflux | 32 | 82 | 40 |
| 6 | H3PW12O40/Fe3O4@Si | EtOH/reflux | 60 | 95 | 41 |
| 7 | MCM-41-nPr-NHSO3H | Solvent free/130 °C | 76 | 95.5 | 42 |
| 8 | [Bmim]Br | Solvent free/140 °C | 120 | 90 | 43 |
| 9 | ETPPBr/PCA-DES | Solvent free/80 °C | 10 | 92 | This work |
