To a stirred solution of (3S,5R,6S)-3-allyl-5-(3-chlorophenyl)-6-(4-chlorophenyl)-1-((2S)-1-cyclopropyl-1-hydroxybutan-2-yl)-3-methylpiperidin-2-one (Example 417, Step A; 60 mg, 0.123 mmol) in EtOAc (1 mL), acetonitrile (1 mL) and water (1.5 mL) was added ruthenium chloride hydrate (2.8 mg, 0.012 mmol) and sodium meta-periodate (6.83 μl, 0.123 mmol) (portionwise over 5 minutes). The reaction was stirred at rt for 20 minutes and then partitioned between EtOAc (60 mL) and water (20 mL). The separated aqueous layer was extracted with EtOAc (2×20 mL) and the combined organic extracts were dried over MgSO4, filtered and evaporated in vacuo. Purification by column chromatography (12 g, SiO2, hexanes/IPA, 1:0 to 9:1) gave the title compound.
