C([N:8]1[CH2:13][CH2:12][CH:11]([N:14]2[CH2:19][CH2:18][CH:17]([N:20]([CH2:28][C:29]([O:31][CH2:32][CH3:33])=[O:30])[C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:16][CH2:15]2)[CH2:10][CH2:9]1)C1C=CC=CC=1.[H][H]>CCO.[Pd]>[CH2:32]([O:31][C:29](=[O:30])[CH2:28][N:20]([CH:17]1[CH2:18][CH2:19][N:14]([CH:11]2[CH2:10][CH2:9][NH:8][CH2:13][CH2:12]2)[CH2:15][CH2:16]1)[C:21]([O:23][C:24]([CH3:27])([CH3:25])[CH3:26])=[O:22])[CH3:33]A suspension of 1.30 g (2.83 mmol) ethyl [(1′-benzyl-[1,4′]bipiperidinyl-4-yl)-tert-butoxycarbonyl-amino]-acetate and 0.16 g 10% Pd/C in 25 mL EtOH was hydrogenated for 5 h at 50° C. and 50 psi hydrogen pressure. The catalyst was removed by suction filtering and the filtrate was evaporated to dryness. The product was obtained as a colourless oil, which was reacted further without purification.
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