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Investigation of CBS reduction of ketone 14.
 | ||||
| entry | catalyst (mol %) | reducing agent | T | dra |
| 1 | 17 (10) | H3B·SMe2 | −78 °C | no conversion |
| 2 | 17 (20) | H3B·THF | 20 °C | complex mixture |
| 3 | 17 (20) | H3B·THF | −50 °C | 1:1 |
| 4 | 17 (20) | catechol borane | −78 °C | 3:2 |
aDetermined from 1H NMR spectra of the crude reaction mixtures.
