[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:9][CH2:10][CH2:11][CH2:12][C:13]([O:15]CC)=[O:14])[CH:6]=[CH:7][CH:8]=1.C(O)C.[OH-].[Na+].Cl>O.O1CCCC1>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:9][CH2:10][CH2:11][CH2:12][C:13]([OH:15])=[O:14])[CH:6]=[CH:7][CH:8]=1
To a solution of ethyl 5-(3-methoxyphenyl)pentanoate (6.01 g, 25.4 mmol) in a mixed solvent of ethanol (50 mL) and tetrahydrofuran (50 mL) was added 2 M aqueous sodium hydroxide solution (25 mL), and the mixture was stirred at room temperature for 3 hr. Water was added to the reaction mixture, and the mixture was acidified with 1 M hydrochloric acid and extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure to give the title compound (5.28 g, yield 99%) as a red-brown oil.
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