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| Entry | Catalyst (mol%) | Time (min) | Yield (%) |
|---|---|---|---|
| 1 | 1 | 30 | 73 |
| 2 | 3 | 15 | 89 |
| 3 | 4 | 7 | 97 |
| 4 | 5 | 5 | 99 |
| 5 | 8 | 5 | 99 |
| 6 | 10 | 5 | 99 |
The mixture of 4a (1 mmol), 5a (1 mmol), NH4OAc (2.5 mmol) and 3a in water (5 mL) was sonicated at 60 °C.
