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Optimization of the catalyst structure. Data determined as in Table 1.
 |
 |
|||
|---|---|---|---|---|
| Entry | Catalyst | Yield (%) | E.r. | |
| 1 | Boc-β-Dmaa-Pro-(D)Val-(R)-βMba (4) | 90 | 75.0:25.0 | |
| 2 |  |
87 | 90.0:10.0 | |
| 3 |  |
73 | 86.5:13.5 | |
| 4 |  |
85 | 89.0:11.0 | |
| 5 |  |
65 | 82.5:17.5 | |
| 6 |  |
95 | 75.0:25.0 | |
| 7 |  |
80 | 75.0:25.0 | |
| 8 |  |
90 | 92.0:8.0 | |
| 9 |  |
90 | 65.0:35.0 | |
