Table 11.
Comparison of initial rates for single-component reactions of 1 and 2 under the different conditions shown.a

| Entrya | Ligand | k1 ([M]/min) | k2 ([M]/min) | k1 / k2 |
|---|---|---|---|---|
| 1 | --- | 1.3 × 10−4 | 3.5 × 10−4 | 0.37 |
| 2 | Boc-Val-OH | 4.7 × 10−3 | 5.2 × 10−3 | 0.90 |
| 3 | Ac-Ile-OH | 7.6 × 10−3 | 5.5 × 10−3 | 1.38 |
See Supporting Information for experimental details.