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| 4c | (S)-2 from 4c | (S)-3c | (R)-2 | ||
Entry | Time (h) | Yield (%) | Ee (%)b | Yield (%) | Ee (%)b | Yield (%) | Ee (%)c |
1 | 1 | 43 | 33 | 31 | 65 | 59 | >99 |
2 | 12 | 24 | 97 | 45 | >99 | 90 | >99 |
3 | 24 | 25 | >99 | 50 | >99 | 96 | >99 |