[CH2:1]([S:3]([NH:6][CH2:7][C:8]1[CH:13]=[CH:12][C:11]([CH:14]([CH3:20])[C:15]([O:17]CC)=[O:16])=[CH:10][C:9]=1[F:21])(=[O:5])=[O:4])[CH3:2].[OH-].[Na+]>O1CCCC1.O>[CH2:1]([S:3]([NH:6][CH2:7][C:8]1[CH:13]=[CH:12][C:11]([CH:14]([CH3:20])[C:15]([OH:17])=[O:16])=[CH:10][C:9]=1[F:21])(=[O:5])=[O:4])[CH3:2]To a solution of ethyl 2-(4-(ethylsulfonamidomethyl)-3-fluorophenyl)propanoate (60 mg, 0.189 mmol) in tetrahydrofuran and water co-solvent, sodium hydroxide (19 mg) was added at room temperature. The mixture was stirred for overnight and extracted with ethyl acetate, dried over magnesium sulfate, the solvent was evaporated in vacuo. It was purified by column chromatography to give 2-(4-(ethylsulfonamidomethyl)-3-fluorophenyl)propanoic acid (55 mg).
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