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| entry | catalyst (equiv) | solvent | yield [%] |
|---|---|---|---|
| 1 | none | MeOH | 0 |
| 2 | none | TFE | 84 |
| 3 | Sc(III)OTf (0.1) | TFE | 58 |
| 4 | Zn(II)OTf (0.1) | TFE | 62 |
| 5 | HOTf (0.1) | TFE | 100 |
| 6 | HOTf (0.1) | MeOH | 82 |
| 7 | HOTf (0.1) | toluene | 24 |
