Table 1.
| ||||
---|---|---|---|---|
Entry | Solvent | T /°C | Time / h | Yield / %a |
1 | DMF | 25 | 18 | 40 |
2 | EtOH | 25 | 20 | 38 |
3 | MeOH | 25 | 20 | 55 |
4 | CH3CN | 25 | 20 | 25 |
5 | CHCl3 | 25 | 20 | 25 |
6 | CH2Cl2 | 25 | 20 | 26 |
7 | THF | 25 | 18 | NR |
8 | MeOH | 35 | 16 | 60 |
9 | MeOH | 40 | 16 | 70 |
10 | MeOH | 45 | 14 | 81 |
11 | MeOH | 55 | 14 | 62 |
12 | MeOH | 65 | 10 | 40 |
Reported yields were isolated yields