Entry | Catalyst (mg) | Solvent | Temperature | Time | Isolated yield % |
---|---|---|---|---|---|
1 | – | – | r.t | 48 h | – |
2 | – | H2O | r.t | 48 h | – |
3 | – | H2O | 80 °C | 48 h | – |
4 | – | – | 80 °C | 48 h | – |
5 | 5 | H2O | 80 °C | 1 h | 57 |
6 | 5 | H2O:EtOH (1:1) | 80 °C | 1 h | 80 |
7 | 5 | H2O:EtOH (1:2) | 80 °C | 1 h | 70 |
8 | 5 | H2O:EtOH (2:1) | 80 °C | 1 h | 63 |
9 | 5 | EtOH | 80 °C | 1 h | 74 |
10 | 5 | H2O:EtOH (1:1) | 80 °C | 45 min | 83 |
11 | 5 | H2O:EtOH (1:1) | 80 °C | 2 h | 60 |
12 | 5 | H2O:EtOH (1:1) | r.t | 10 h | 80 |
13 | 5 | H2O:EtOH (1:1) | 100 °C | 1:30 h | 75 |
14 | 10 | H2O:EtOH (1:1) | 60 °C | 30 min | 82 |
15 | 20 | H2O:EtOH (1:1) | 60 °C | 30 min | 87 |
16 | 30 | H2O:EtOH (1:1) | 60 °C | 25 min | 89 |
17 | 40 | H2O:EtOH (1:1) | 60 °C | 20 min | 93 |
18 | 50 | H2O:EtOH (1:1) | 60 °C | 20 min | 94 |