Methanol → (5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-1-((S)-1-hydroxybutan-2-yl)piperidin-2-one

Participants

Reaction Conditions

Reaction Steps

To an ice-cooled solution of 48.5 g (115 mmol) of (S)-methyl 2-((2S,3R)-3-(3-chlorophenyl)-2-(4-chlorophenyl)-6-oxopiperidin-1-yl)butanoate (Example 185, Step A) in ethyl ether (850 mL) was added 5.96 g (90%, 246 mmol) of lithium borohydride. The resulting light yellow solution was stirred at 0° C. for 3 h, and then MeOH (2.5 mL) and more ethyl ether (100 mL) were added. Gas evolution was observed upon the addition of MeOH. After 40 min, the reaction was quenched by cautious addition of 1 N HCl until bubbling subsided. The mixture was extracted with EtOAc (2×), and the combined organic layers were washed with saturated aqueous sodium chloride (1×). The organic layer was dried over Na2SO4, filtered and the filtrate was concentrated to afford the title compound as a white foam. The crude product was used directly in the next step without further purification.

Provenance & Evidence