[O:1]=[C:2]1[CH2:7][CH2:6][CH2:5][CH2:4][N:3]1[CH2:8][C:9]1[CH:18]=[CH:17][C:12]([C:13]([O:15]C)=[O:14])=[CH:11][CH:10]=1.O.[OH-].[Li+]>CO.O>[O:1]=[C:2]1[CH2:7][CH2:6][CH2:5][CH2:4][N:3]1[CH2:8][C:9]1[CH:10]=[CH:11][C:12]([C:13]([OH:15])=[O:14])=[CH:17][CH:18]=1Methyl 4-[(2-oxopiperidino)methyl]benzoate (2.47 g, 10.0 mmol) obtained in Step 1 was dissolved in a mixed solvent of methanol (30 mL) and water (10 mL), and lithium hydroxide monohydrate (2.10 g, 50.0 mmol) was added thereto, followed by stirring at room temperature for 30 minutes. The reaction mixture was concentrated under reduced pressure, and 6 mol/L hydrochloric acid was added to the resulting residue to adjust the pH to 1, followed by extraction with chloroform. The organic layer was dried over anhydrous magnesium sulfate, and then the solvent was distilled away under reduced pressure to afford 4-[(2-oxopiperidino)methyl]benzoic acid (629 mg. 27%).
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