Table 1. Reaction Conditions.
| entry | TfOH (equiv) | solvent | yield (%)a18c |
|---|---|---|---|
| 1 | 1.0 | DCM (0.10 M) | 89 |
| 2 | 1.0 | PhMe (0.10 M) | 93 |
| 3 | 1.0 | PhMe (0.05 M) | 84 |
a
Isolated yield.
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