[CH2:1]([O:8][C:9]1[CH:10]=[C:11]2[C:16](=[CH:17][CH:18]=1)[C:15](=O)[CH2:14][CH2:13][CH2:12]2)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl.O1CCC[CH2:22]1>C[Mg]Br>[CH2:1]([O:8][C:9]1[CH:10]=[C:11]2[C:16]([C:15]([CH3:22])=[CH:14][CH2:13][CH2:12]2)=[CH:17][CH:18]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1To a solution of the obtained 6-(benzyloxy)-3,4-dihydronaphthalen-1(2H)-one (34.5 g) in tetrahydrofuran (300 mL), methyl magnesium bromide (3M diethyl ether solution, 55 mL) was added at 0° C., followed by stirring at room temperature for 1 hour. The reaction mixture was cooled to 0° C. and poured into ice-saturated aqueous ammonium chloride solution. After adding 2N hydrochloric acid, the mixture was stirred at room temperature for 3 hours. Then, the resultant was extracted with ethyl acetate and the organic layer was successively washed with water and brine, dried and concentrated. The obtained residue was purified by silica gel column chromatography (hexane:ethyl acetate=10:1) to thereby give the title compound (24.8 g) having the following physical properties.
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