[N:1]1([C:12]([O:14][C:15]2[CH:16]=[N:17][CH:18]=[CH:19][CH:20]=2)=[O:13])[CH2:6][CH2:5][CH:4]([C:7]([O:9]CC)=[O:8])[CH2:3][CH2:2]1.[OH-].[Na+].Cl>C1COCC1.C(O)C>[N:17]1[CH:18]=[CH:19][CH:20]=[C:15]([O:14][C:12]([N:1]2[CH2:2][CH2:3][CH:4]([C:7]([OH:9])=[O:8])[CH2:5][CH2:6]2)=[O:13])[CH:16]=14-Ethyl 1-pyridin-3-yl piperidine-1,4-dicarboxylate (0.732 g) was dissolved in THF (15 ml) and ethanol (8.0 ml), and under ice cooling, an aqueous 1 M sodium hydroxide solution (3.9 ml) was dropwise added thereto. This was stirred at room temperature for 2 hours, and neutralized with 1 M hydrochloric acid (0.5 ml). The reaction liquid was concentrated under reduced pressure, methanol was added to the residue, and the precipitated salt was removed through suction filtration. The filtrate was concentrated to obtain 1-[(pyridin-3-yloxy)carbonyl]piperidine-4-carboxylic acid (0.727 g) as a colorless solid.
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