Table 3.
| ||||
|---|---|---|---|---|
| entry | R | PG | yield (%) | ee (%) |
| 1 | Me | Bn | 96 | > 99 |
| 2 | Bn | Bn | 96 | > 99 |
| 3c | Allyl | Bn | 92 | > 99 |
| 4 | H | Bn | 80 | 90 |
| 5 | H | Me | 98 | 93 |
| 6 | H | H | 86 | 95 |
| 7 | Me | H | 92 | > 99 |
| 8 | Me | Me | 96 | 97 |
Absolute configuration assigned by chemical correlation or analogy.
Enantiomeric excess determined by chiral HPLC analysis.
Reaction performed at rt.