[F:1][C:2]1[CH:3]=[C:4]([CH:14]([CH3:20])[C:15]([O:17]CC)=[O:16])[CH:5]=[CH:6][C:7]=1[CH2:8][NH:9][S:10]([CH3:13])(=[O:12])=[O:11].O1CCCC1.O.[OH-].[Li+]>C(OC(=O)C)C.C(O)(=O)C>[F:1][C:2]1[CH:3]=[C:4]([CH:14]([CH3:20])[C:15]([OH:17])=[O:16])[CH:5]=[CH:6][C:7]=1[CH2:8][NH:9][S:10]([CH3:13])(=[O:11])=[O:12]To a stirred solution of ethyl 2-(3-fluoro-4-(methylsulfonamidomethyl)phenyl)propanoate (458 mg, 1.51 mmol) in co-solvent with tetrahydrofuran and water (1:1) were added lithium hydroxide (190 mg, 4.529 mmol). The reaction mixture was refluxed for 15 h, then cooled to room temperature, acidified to pH 3˜4 with acetic acid. The residue dissolved in ethylacetate and washed with water and brine. The organic layer was dried over magnesium sulfate and filtered. The filtrate removed in vacuo. The crude was purified by column chromatography. 2-(3-Fluoro-4-(methylsulfonamidomethyl)phenyl)propanoic acid (218 mg) was obtained as 52% yield.
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