[OH:1][C:2]1[CH:3]=[C:4]([CH2:8][C:9]([O:11][CH2:12][CH:13]=[CH2:14])=[O:10])[CH:5]=[CH:6][CH:7]=1.C(=O)([O-])[O-].[K+].[K+].Br[C:22]([CH3:29])([CH3:28])[C:23]([O:25][CH2:26][CH3:27])=[O:24].O>CN(C)C=O>[CH2:12]([O:11][C:9]([CH2:8][C:4]1[CH:3]=[C:2]([CH:7]=[CH:6][CH:5]=1)[O:1][C:22]([CH3:29])([CH3:28])[C:23]([O:25][CH2:26][CH3:27])=[O:24])=[O:10])[CH:13]=[CH2:14]Allyl 3-hydroxyphenylacetate (5.72 g, 32.9 mmol), potassium carbonate (6.82 g, 49.35 mmol), and ethyl 2-bromoisobutyrate (7.35 mL, 49.35 mmol) were dissolved in dimethylformamide (10 mL), and the mixture was stirred for 60 hours at 80° C. The reaction mixture was added to water, and the resultant mixture was extracted with diethyl ether, followed by washing sequentially with water and saturated brine, drying over magnesium sulfate, concentration under reduced pressure, and purification by silica gel column chromatography (n-hexane/ethyl acetate=20/1), whereby the target compound was obtained (6.40 g, 20.90 mmol, 63.5%).
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