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| |||||
|---|---|---|---|---|---|
| Entry | R | X | Solvent | Yield (%) | ee (%) |
| 1 | H | TfO− | DME | 85 | 91 |
| 2 | " | BArF− | " | 69 | 85 |
| 3 | Me | TfO− | " | 9 | 58 |
| 4 | " | BArF− | " | Trace | — |
| 5 | " | TfO− | THF | 10 | 71 |
| 6 | " | BArF− | " | 28 | 64 |
