To a solution of (1RS,2RS)-1-(4-fluorophenyl)-1-hydroxy-3-(4-(trifluoromethyl)phenyl)-2-propylamine (150 mg, 0.42 mmol) in acetonitrile (10 ml) were added 4-dimethylaminonaphthalenecarboxylic acid (89 mg, 0.42 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (119 mg, 0.62 mmol) and 1-hydroxy-1H-benzotriazole (63.6 mg, 0.42 mmol) and the mixture was stirred overnight at room temperature. The reaction solution was diluted with water (50 ml) and extracted with ethyl acetate (50 ml×2). The extract was washed with saturated brine, dried over anhydrous magnesium sulfate and evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1) and recrystallized from ethyl acetate-hexane to give the title compound (149 mg, 70%).
