C1(C(C2C=CC=CC=2)[N:8]2[CH2:11][CH:10]([CH:12]3[CH2:17][CH2:16][N:15]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:14][CH2:13]3)[CH2:9]2)C=CC=CC=1.Cl.[OH-].[Na+]>[OH-].[C+4].[Pd+2].[OH-].[OH-].[OH-].[OH-].[OH-].CO>[NH:8]1[CH2:11][CH:10]([CH:12]2[CH2:13][CH2:14][N:15]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:16][CH2:17]2)[CH2:9]1tert-Butyl 4-[1-(diphenylmethyl)azetidin-3-yl]piperidine-1-carboxylate (1.9 g) was mixed with MeOH (50 ml), and 1M hydrochloric acid (5.1 ml) and 20% palladium carbon hydroxide (600 mg) were added thereto, followed by stirring at room temperature for 4 hours under hydrogen atmosphere of 3 atm. After returning to normal pressure under argon atmosphere, a 1M aqueous NaOH solution (1 ml) was added thereto. The reaction mixture was filtered using Celite as a filtration adjuvant, and the filtrate was concentrated under reduced pressure. CHCl3 and a 1M aqueous NaOH solution were added to the obtained residue, and the organic layer was dried over Na2SO4 and then concentrated under reduced pressure. The obtained residue was purified by basic silica gel column chromatography (CHCl3/MeOH) to obtain tert-butyl 4-(azetidin-3-yl)piperidine-1-carboxylate (1.1 g).
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