Lithium tri-s-butylborohydride → (3S,5R,6S)-3-Allyl-5-(3-chlorophenyl)-6-(4-chlorophenyl)-1-((2S,3S)-2-hydroxypentan-3-yl)-3-methylpiperidin-2-one

To a stirred solution of (3S,5R,6S)-3-allyl-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-methyl-1-((S)-2-oxopentan-3-yl)piperidin-2-one (185 mg, 0.40 mmol; Example 149, Step B) in THF (4 mL) under a nitrogen atmosphere at −8° C. (internal temperature) was added L-Selectride® (Aldrich, St. Louis, Mo.) (0.48 mL, 0.48 mmol, 1M solution in THF) dropwise over 2 minutes (internal temperature reached −5° C.). After 10 minutes the reaction was quenched with MeOH (0.1 mL) and treated with Oxone® (2 KHSO5.KHSO4.K2SO4, DuPont, Wilmington, Del.) (992 mg, 1.61 mmol) in water (30 mL) and then it was stirred at rt for 2 hours. After this time the reaction was partitioned between EtOAc (50 mL) and Na2S2O3 (30 mL, saturated aqueous solution). The separated organic layer was washed with brine (20 mL) and then it was dried over MgSO4, filtered and evaporated in vacuo to give the title compound. Mass Spectrum (ESI) m/z=460.0 (M+1).