| Entry | Catalyst (mol%) | Time | Yield (%) |
| 1 | 5 | 180 min | 65 |
| 2 | 10 | 120 min | 73 |
| 3 | 15 | 90 min | 85 |
| 4 | 20 | 40 min | 96 |
| 5 | 25 | 40 min | 96 |
| 6 | 30 | 40 min | 96 |