| |||
Entry | Catalyst | Solvent | Yield (%)b |
1 | none | EtOH | 0 |
2 | NH4Cl | EtOH | 95 |
3 | NH4Cl | CH2Cl2 | 0 |
4 | NH4Cl | ether | <20 |
5 | NH4Cl | toluene | <20 |
6 | NaCl | EtOH | 0 |
7 | [BMIM]+ | EtOH | 0 |