[H-].[Na+].[CH2:3]([O:10][CH2:11][CH:12]([OH:17])[CH2:13][CH2:14][CH2:15][OH:16])[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[CH:18]([Si:21](Cl)([CH:25]([CH3:27])[CH3:26])[CH:22]([CH3:24])[CH3:23])([CH3:20])[CH3:19].C(OCC)(=O)C>O1CCCC1.O>[CH2:3]([O:10][CH2:11][CH:12]([OH:17])[CH2:13][CH2:14][CH2:15][O:16][Si:21]([CH:25]([CH3:27])[CH3:26])([CH:22]([CH3:24])[CH3:23])[CH:18]([CH3:20])[CH3:19])[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=10.96 g of sodium hydride (60 wt % in oil) was added to a solution of 5.0 g of 5-(benzyloxy)pentane-1,4-diol in 50 mL of tetrahydrofuran in a nitrogen atmosphere at a temperature of 5° C. to 10° C., and the obtained mixture was then stirred at room temperature for 30 minutes. Thereafter, 5.3 mL of triisopropylsilyl chloride was added dropwise to the reaction mixture at a temperature of 5° C. to 10° C. The reaction mixture was stirred at room temperature for 1 hour, and it was then added to a mixture of 100 mL of ethyl acetate and 100 mL of water. The organic layer was fractionated. The obtained organic layer was successively washed with 100 mL of a saturated sodium hydrogen carbonate aqueous solution, 100 mL of water and 100 mL of a saturated sodium chloride aqueous solution, and it was then dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, and the obtained residue was then purified by silica gel column chromatography (ethyl acetate/hexane=1/5 to 1/5), so as to obtain 5.4 g of 1-benzyloxy-5-((triisopropyl)silyloxy)pentan-2-ol in the form of a colorless oily product.
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