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|---|---|---|---|---|---|---|
| Entry | Catalyst | Solvent | T (°C) | t (h) | 4k (%) | 4′k (%) |
| 1 | HClO4 (5%) | MeOH | r.t. | 24 | 0 | 98 |
| 2 | TFA (20%) | EtOH | r.t. | 24 | 36 | 40 |
| 3 | TFA (20%) | EtOH | 50 | 24 | 35 | 42 |
| 4 | ZrCl4 (10%) | MeOH | r.t. | 24 | 40 | 46 |
| 5 | ZrCl4 (10%) | MeOH | 50 | 16 | 43 | 41 |
| 6 | ZrCl4 (10%) | PEG-400 | 50 | 2 | 54 | 0 |
| 7 | ZrCl4 (10%) | PEG-400 | r.t. | 1 | 76 | 0 |
