Investigation of the solvent effect.
| |||||||
|---|---|---|---|---|---|---|---|
| Entry | Solvent (dry) | Time (h) | Yield% (3b) | Entry | Solvent (dry) | Time (h) | Yield% (3b) |
| 1 | CHCl3 | 5 | 10 | 3 | DMF | 3 | 81 |
| 2 | CH3CN | 5 | 15 | 4 | THF | 3 | 70 |
| |||||||
|---|---|---|---|---|---|---|---|
| Entry | Solvent (dry) | Time (h) | Yield% (3b) | Entry | Solvent (dry) | Time (h) | Yield% (3b) |
| 1 | CHCl3 | 5 | 10 | 3 | DMF | 3 | 81 |
| 2 | CH3CN | 5 | 15 | 4 | THF | 3 | 70 |