Water → (-)-4-(4,4-Difluorocyclohexyl)-3-{fluoro[4-(trifluoromethyl)phenyl]methyl}-7,7-dimethyl-2-{1-[5-(2-methylpropoxy)pyrimidine-2-yl]piperidin-4-yl}-5,6,7,8-tetrahydroquinoline-5-ol

Participants

Reaction Conditions

Reaction Steps

To a solution of 55 mg (0.085 mmol) of (−)-4-(4,4-Difluorocyclohexyl)-3-{fluoro[4-(trifluoromethyl)phenyl]methyl}-2-[1-(5-hydroxypyrimidin-2-yl)piperidin-4-yl]-7,7-dimethyl-5,6,7,8-tetrahydroquinolin-5-ol, which was prepared by a method similar to that of Example 4, in 1 ml of tetrahydrofuran, 33 mg (0.10 mmol) of cesium carbonate and 11 μl (0.094 mmol) of 1-iodo-2-methyl propane were added, and the reaction solution was stirred at room temperature for 2 hours, at 50° C. for 3 hours and further at room temperature for 14 hours. After stirring at room temperature, 50 (0.43 mmol) of 1-iodo-2-methyl propane and 50 mg (0.15 mmol) of cesium carbonate were added and the reaction solution was stirred at 70° C. for 9 hours. After stirring with heating, 50 μl (0.43 mmol) of 1-iodo-2-methyl propane and 100 mg (0.31 mmol) of cesium carbonate were further added and the reaction solution was stirred at room temperature for 14.5 hours. After completion of the reaction, the reaction solution was poured into water and 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=95/5-70/30 (V/V)] and the fraction including the desired compound was concentrated under reduced pressure. n-Hexane was added to the obtained residue and the precipitate was obtained by filtration to provide 41 mg of the title compound as a white solid (yield: 68%).

Provenance & Evidence