Br[Zn][CH2:3][C:4]([O:6][CH2:7][CH3:8])=[O:5].[C:9]1(/[CH:15]=[CH:16]/[C:17]([C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)=[O:18])[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.Cl.C(OCC)(=O)C>C1COCC1>[OH:18][C:17]([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)(/[CH:16]=[CH:15]/[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1)[CH2:3][C:4]([O:6][CH2:7][CH3:8])=[O:5]Under nitrogen atmosphere, 15 mL of THF was added to 3.05 g mmol, 1.0 equivalent) of (BrZnCH2COOEt.THF)2. Under argon atmosphere, a solution of 1.04 g (5 mmol) of (E)-chalcone in 2.5 mL of THF was added dropwise while stirring at 0˜5° C. The mixture was stirred at 0˜5° C. for 3 hours. 7.5 mL of 1N hydrochloric acid was added dropwise at 20° C. or lower, followed by dilution with 25 mL of ethyl acetate. Then, the layers were separated. The organic layer was washed successively with 5 mL (×2) of 1N hydrochloric acid, 5 mL of an aqueous saturated sodium chloride solution, 10 mL (×2) of an aqueous saturated sodium bicarbonate solution, and 5 mL (×2) of an aqueous saturated sodium chloride solution. After washing, the organic layer was dried with anhydrous magnesium sulfate. Concentration under reduced pressure afforded 1.44 g of the desired product (yield 97%).
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