| Entry | Cat. | Solvent | t/h | Yieldb/% |
| 1 | None | H2O | 6 | - |
| 2 | PWA | H2O | 6 | 82 |
| 3 | PMA | H2O | 6 | 98 |
| 4 | PMA | H2O | 8 | 98 |
| 5 | PMA | H2O | 4 | 98 |
| 6 | PMA | H2O | 3 | 91 |
| 7 | PMA | H2O | 2 | 84 |
| 8 | PMA (0.0075 g) | H2O | 4 | 98 |
| 9 | PMA (0.010 g) | H2O | 4 | 98 |
| 10 | PMA (0.0025 g) | H2O | 4 | 76 |
| 11 | PMA | H2O | 4 | 98c |