Hydrochloric Acid → (-)-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

Participants

Reaction Conditions

Reaction Steps

To 4.30 g (5.13 mmol) of (−)-4-(4,4-Difluorocyclohexyl)-3-{fluoro[4-(trifluoromethyl)phenyl]methyl}-5-[(4-methoxybenzyl)oxy]-7,7-dimethyl-2-{1-[5-(morpholin-4-yl)pyrimidin-2-yl]piperidin-4-yl}-5,6,7,8-tetrahydroquinoline, which was prepared by a method similar to that of Reference Example 12, 14 ml of conc. hydrochloric acid, 36 ml of methanol and 40 ml of 1,4-dioxane were added, and the reaction solution was stirred at 70° C. for 1.5 hours. After completion of the reaction, the reaction solution was poured into 200 ml of saturated sodium hydrogencarbonate aqueous solution to which 14 ml of 6 N sodium hydroxide aqueous solution had been added 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=3/1-2/1 (V/V)] and the fraction including the desired compound was concentrated under reduced pressure. Toluene was added to the obtained residue and the precipitate was obtained by filtration to provide 2.60 g of the title compound as a white solid (yield: 78%).

Provenance & Evidence