[CH2:1]([Mg]Cl)[CH3:2].[CH3:5][O:6][C:7]1[CH:22]=[CH:21][C:10]([C:11]([C:13]2[CH:18]=[CH:17][C:16]([O:19][CH3:20])=[CH:15][CH:14]=2)=[O:12])=[CH:9][CH:8]=1.[Cl-].[NH4+]>C1COCC1>[CH3:20][O:19][C:16]1[CH:17]=[CH:18][C:13]([C:11]([C:10]2[CH:9]=[CH:8][C:7]([O:6][CH3:5])=[CH:22][CH:21]=2)([OH:12])[CH2:1][CH3:2])=[CH:14][CH:15]=1Into a reactor were introduced 31.9 mL (30.9 mol; 0.97 M THF solution) of ethylmagnesium chloride and 20 mL of THF under a nitrogen atmosphere. The contents were cooled to 4° C. Thereafter, a solution prepared by mixing 5.00 g (20.6 mmol) of 4,4′-dimethoxybenzophenone with 20 mL of THF was gradually added dropwise thereto, and this mixture was stirred at room temperature for 1 hour. Saturated aqueous ammonium chloride solution was added to the reaction mixture. The organic layer was extracted with ethyl acetate, and the extract was dried with anhydrous magnesium sulfate and then concentrated under reduced pressure. The concentrate was purified by column chromatography to obtain 3.06 g (55%) of the target compound as a light-yellow oily substance.
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