Table 3.
Screen of reducing agents.
| entry | Reductant | yield (%) |
|---|---|---|
| 1 | Et3SiH | 0 |
| 2 | NaBH(OAc)3 | 0 |
| 3 | Hantzsch ester 29 | 3 |
| 4 | LiBH4 | 85 |
| 5 | NaBH4 | 93a |
a
product isolated in 15:1 dr and 92% ee.
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