[N+:1]([C:4]1[CH:24]=[CH:23][CH:22]=[CH:21][C:5]=1[CH2:6][NH:7][CH:8]1[CH2:13][CH2:12][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:10][CH2:9]1)([O-])=O>CO>[NH2:1][C:4]1[CH:24]=[CH:23][CH:22]=[CH:21][C:5]=1[CH2:6][NH:7][CH:8]1[CH2:13][CH2:12][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:18])[CH3:19])=[O:15])[CH2:10][CH2:9]1A solution of tert-Butyl 4-(2-nitrobenzylamino)piperidine-1-carboxylate (24 g, 71.6 mmol) in MeOH (150 ml) was stirred under an atmosphere of hydrogen for 24 hours. The reaction mixture was filtered and evaporated to give the crude amine, which was used without further purification.
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