[C:1]([CH2:3][N:4]1[CH2:9][CH2:8][CH:7]([CH2:10][NH:11][C:12](=[O:18])[O:13][C:14]([CH3:17])([CH3:16])[CH3:15])[CH2:6][CH2:5]1)#[N:2]>CO.[Ni]>[NH2:2][CH2:1][CH2:3][N:4]1[CH2:9][CH2:8][CH:7]([CH2:10][NH:11][C:12](=[O:18])[O:13][C:14]([CH3:16])([CH3:15])[CH3:17])[CH2:6][CH2:5]1To a hydrogenation flask charged with a solution of tert-butyl (1-(cyanomethyl)piperidin-4-yl)methylcarbamate (5.4 g, 21.3 mmol) in CH3OH (20 mL) was added Raney nickel (˜1 g, rinsed with CH3OH). The flask was shaken at room temperature under hydrogen (40 psi) overnight. The reaction mixture was then filtered through a celite cake, and the filtrate was concentrated to give sticky foam which was used in the next step without further purification.
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