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| ||
|---|---|---|
| Entry | Acid (equiv.) | 4aa (yield%) |
| 1 | AcOH (3) | 85 |
| 2 | AcOH (4) | 75 |
| 3 | AcOH (5) | 72 |
| 4 | PivOH (3) | 1 |
| 5 | iBuCOOH (3) | 71 |
| 6 | TFA (3) | 5 |
