[CH3:1][Mg]Br.[Si:4]([O:11][CH2:12][C:13]1([CH:17]=[O:18])[CH2:16][CH2:15][CH2:14]1)([C:7]([CH3:10])([CH3:9])[CH3:8])([CH3:6])[CH3:5].[Cl-].[NH4+]>O1CCCC1>[Si:4]([O:11][CH2:12][C:13]1([CH:17]([OH:18])[CH3:1])[CH2:14][CH2:15][CH2:16]1)([C:7]([CH3:10])([CH3:9])[CH3:8])([CH3:6])[CH3:5]Methylmagnesium bromide (21 mL, 1.0 M tetrahydrofuran solution) was cooled to 0° C., a solution of 1-({[tert-butyl(dimethyl)silyl]oxy}methyl)cyclobutanecarbaldehyde (4.0 g) in tetrahydrofuran (40 mL) was added dropwise, and the mixture was stirred at 0° C. for 1 hr. Methylmagnesium bromide (10 mL, 1.0 M tetrahydrofuran solution) was added, and the mixture was stirred at 0° C. for 30 min. The reaction mixture was added to saturated aqueous ammonium chloride solution, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography to give the title compound as an oily compound (2.5 g, 58%).
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