[Mg].Br[C:3]1[CH:4]=[C:5]([CH:18]2[CH2:21][CH2:20][CH2:19]2)[C:6]([O:16][CH3:17])=[C:7]([CH:9]([O:13]CC)OCC)[CH:8]=1.C[Mg]Br.[O:25]1[CH2:29]CCC1.Cl.[O:31]1CCCC1>>[CH:18]1([C:5]2[CH:4]=[C:3]([CH:8]=[C:7]([CH:9]=[O:13])[C:6]=2[O:16][CH3:17])[C:29]([OH:25])=[O:31])[CH2:19][CH2:20][CH2:21]1To magnesium (106 mg), tetrahydrofuran (3.5 mL), 5-bromo-3-cyclobutyl-1-diethoxymethyl-2-methoxybenzene (1.33 g) and a 0.97M methylmagnesium bromide-tetrahydrofuran solution (1.32 mL) was added, and then the mixture was stirred at room temperature for 1.5 hours. The reaction solution was cooled to 0° C. and stirred under a carbon dioxide atmosphere for 15 hours, and then 2N hydrochloric acid (10 mL) was added and the mixture was stirred at mom temperature for 1 hour. The organic solvent was distilled off under reduced pressure and then extracted with diisopropylether. The organic layer was extracted with 1N sodium hydroxide added thereto, and then the aqueous layer was washed twice with diisopropylether. The aqueous layer was acidified with 4N hydrochloric acid added thereto, and then extracted with ethyl acetate. The organic layer was washed with saturated brine, and then dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure to obtain the title compound (458 mg) as a brown solid.
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