[F:1][CH2:2][C:3]([CH2:7][F:8])([OH:6])[C:4]#[CH:5].[C:9]1([CH3:19])[CH:14]=[CH:13][C:12]([S:15](Cl)(=[O:17])=[O:16])=[CH:11][CH:10]=1.[H-].[Na+].O>O1CCCC1>[C:9]1([CH3:19])[CH:14]=[CH:13][C:12]([S:15]([O:6][C:3]([CH2:7][F:8])([C:4]#[CH:5])[CH2:2][F:1])(=[O:17])=[O:16])=[CH:11][CH:10]=1An amount (6.6 g) of 1-fluoro-2-fluoromethyl-3-butyn-2-ol and p-toluenesulfonyl chloride (9.5 g) were dissolved in tetrahydrofuran (100 ml); to the solution under cooling with ice, 60% oily sodium hydride (2.4 g) was added under a nitrogen atmosphere. After the end of the addition, the mixture was stirred for 5 hours while its temperature was raised to room temperature. To the reaction mixture, water was added followed by extraction with ether. The extract was washed with water and a saturated aqueous solution of sodium chloride, dried with anhydrous sodium sulfate and concentrated under reduced pressure. The resulting residue was subjected to silica gel column chromatography (eluent; hexane/methylene chloride=1/1) to give the titled compound (11.1 g).
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