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| ||||
|---|---|---|---|---|
| Entry | Activating agent | Solvent | t (h) | Yield (%) |
| 1 | AcOH | 1,4-Dioxane | 18 | 12 |
| 2 | H2SO4 | DMF | 16 | 20 |
| 3 | CSA | Toluene | 16 | 16 |
| 4 | Py-HCl | Pyridine | 24 | 30 |
| 5 | p-TsOH | 1,4-Dioxane | 8 h | 59 |
