| Entry | Reactants | Catalyst | Air | Time | Yield (%)a |
| 1 | | No | Yes | 16 h | 70 |
| 2 |
| 3/4 CEC | Yes | 60 min | 80 |
| 3 |
| 1/2 CEC | Yes | 30 min | 82 |
| 4 |
| 1/4 CEC | Yes | 25 min | 95 |
| 5 |
| 1/4 CEC | No (Argon) | 16 h | NR |
| 6 | 1b | No | Yes | 18 h | NR |
| 7 |
| 3/4 CEC | Yes | 90 min | 65 |
| 8 |
| 1/2 CEC | Yes | 50 min | 70 |
| 9 |
| 1/4 CEC | Yes | 40 min | 86 |
| 10 |
| 1/4 CEC | No (Argon) | 18 h | NR |