Hexane → 5-[(4-Chlorophenyl)sulfonyl]-5-(2,5-difluorophenyl)-4-methyl-1-pentanol

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Reaction Steps

The 2-[5-(t-butyldiphenylsilyloxy)-1-[(4-chlorophenyl)sulfonyl]-2-methylpentyl]-1,4-difluorobenzene (Isomer 38-A) (710 mg, 1.13 mmol) obtained in Example 38 was dissolved in methylene chloride (20 ml). Under ice cooling, hydrogen fluoride-pyridine (0.64 ml) was added dropwise. After completion of the dropwise addition, the reaction mixture was stirred at room temperature for 14 hours. To the reaction mixture was added a saturated aqueous solution (20 ml) of sodium bicarbonate, followed by extraction with diethyl ether. The organic layer was washed successively with 1N hydrochloric acid, a saturated aqueous solution of sodium bicarbonate and brine, and dried over anhydrous magnesium sulfate. After filtration, the filtrate was concentrated under reduced pressure. The residue thus obtained was purified by silica gel chromatography (hexane:ethyl acetate=2:1) to yield a colorless oil. The resulting colorless oil was solidified with hexane, whereby the title compound (283 mg, 64%) was obtained as a white powder.

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