[CH:1]([N:4]1[CH2:9][CH2:8][CH:7]([C:10]([O:12]CC)=[O:11])[CH2:6][CH2:5]1)([CH3:3])[CH3:2].O.[OH-].[Li+:17]>O1CCCC1>[CH:1]([N:4]1[CH2:5][CH2:6][CH:7]([C:10]([O-:12])=[O:11])[CH2:8][CH2:9]1)([CH3:3])[CH3:2].[Li+:17]Ethyl 1-isopropylpiperidine-4-carboxylate (Farmaco., 1993, Vol. 48, p. 1439) (3.43 g) was dissolved in tetrahydrofuran (60 ml), and water (15 ml) and lithium hydroxide (421 mg) were added at room temperature to stir the mixture overnight. The reaction mixture was concentrated under reduced pressure to obtain the title compound (3.05 g) as a white solid.
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