To a solution of 65 mg (95 μmol) of 4-(4,4-Difluorocyclohexyl)-3-{fluoro[4-(trifluoromethyl)phenyl]methyl}-7,7-dimethyl-2-(1-{5-[(methylamino)methyl]pyrimidin-2-yl}piperidin-4-yl)-5,6,7,8-tetrahydroquinolin-5-ol, which was prepared by a method similar to that of Example 58, in 0.2 ml of dichloromethane, 30 μl (0.19 mmol) of triethylamine and 8 μl (0.1 mmol) of methanesulfonyl chloride were added, and the reaction solution was stirred at room temperature for 1 hour. After completion of the reaction, saturated sodium hydrogencarbonate aqueous solution was poured into the reaction solution and the reaction solution was extracted with ethyl acetate. The organic layer was washed with saturated sodium chloride aqueous solution and dried with anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure. The obtained residue was subjected to silica gel column chromatography [n-hexane/ethyl acetate=100/0-40/60 (V/V)] and the fraction including the desired compound was concentrated under reduced pressure to provide 37 mg of the title compound as a white solid (yield: 52%).
