Sodium borohydride → (S)-N-(3,4-Dimethyl-phenyl)-2-(4-fluoro-phenyl)-2-hydroxy-N-[2-(6-trifluoromethyl-pyridin-3-yl)-ethyl]-acetamide

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A solution of N-(3,4-dimethyl-phenyl)-2-(4-fluoro-phenyl)-2-oxo-N-[2-(6-trifluoromethyl-pyridin-3-yl)-ethyl]-acetamide (515 mg, 1.16 mmol) was dissolved in MeOH (8 mL), cooled to 0° C. and treated with NaBH4 (88 mg, 2.33 mmol) and stirred for 12 h at ambient temperature. The reaction mixture was quenched with aqueous K2CO3 (2 M, 1 mL), concentrated, then redissolved in EtOAc (15 mL) and washed with aqueous K2CO3 (2 M, 3×15 mL). The combined aqueous layers were extracted with EtOAc (3×15 mL) and the combined organic layers dried over sodium sulfate. Concentration and purification by chromatography (SiO2, heptane:ethyl acetate=95:5 to 60:40) afforded the racemic compound (501 mg, 97%) as a lightyellow oil. Separation by chromatography on a chiral column provided the title compound as a colourless oil MS m/e: 447.2 [M+H]+ which crystallized upon standing.

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