[OH:1][C:2]1[CH:11]=[C:10]2[C:5]([CH2:6][CH2:7][CH2:8][C:9]2=[O:12])=[CH:4][CH:3]=1.Br[CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16].C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O.O>[CH2:18]([O:17][C:15](=[O:16])[CH2:14][O:1][C:2]1[CH:3]=[CH:4][C:5]2[CH2:6][CH2:7][CH2:8][C:9](=[O:12])[C:10]=2[CH:11]=1)[CH3:19]
To a solution of 3,4-dihydro-7-hydroxy-1(2H)-naphthalenone (15.3 g, 94.3 mmol) in N,N-dimethylformamide (150 mL) were serially added ethyl bromoacetate (16.5 g, 99.0 mmol) and potassium carbonate (13.7 g, 99.0 mmol) and the mixture was stirred at 60° C. for 6 hours. This reaction mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with water and saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate (MgSO4), filtered, and concentrated under reduced pressure. The residue was crystallized from hexane-ethyl acetate to provide 19.5 g of the title compound. Yield 83%.
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