| Entry | Catalyst | Solvent | Amount of catalyst | Temp/˚C | Time/h | Yielda/% |
| 1 | FeCl3 | Neat | 0.1 mmol | 70 | 5 | 74 |
| 2 | H3PMo12O40 | Neat | 0.2 mmol | 80 | 5 | 40 |
| 3 | H3PW12O40 | Neat | 0.2 mmol | 70 | 5 | - |
| 4 | SnCl2 | Neat | 0.2 mmol | 80 | 24 | 50 |
| 5 | SnCl2 | Methanol | 0.2 mmol | 60 | 24 | 48 |
| 6 | CuI | Neat | 0.2 mmol | 70 | 24 | 40 |
| 7 | BiCl3 | Neat | 0.2 mmol | 80 | 24 | 55 |
| 8 | BiCl3 | Methanol | 0.2 mmol | 60 | 24 | 50 |
| 9 | BiCl3 | t-BuOH | 0.2 mmol | 80 | 48 | 20 |
| 10 | BiCl3 | DMF | 0.2 mmol | 80 | 48 | 60 |
| 11 | I2 | Methanol | 0.2 mmol | 60 | 24 | - |