Ammonium Hydroxide → (4-Amino-butyl)-(4-tert-butoxycarbonylamino-butyl)-carbamic acid tert-butyl ester

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Reaction Steps

The nitrile 11 (2.00 g, 5.6 mmol) was dissolved in ethanol (100 mL). NH4OH (10 mL) and Raney nickel (8 g) were added and ammonia gas was bubbled through the solution for 20 minutes at 0° C. The suspension was hydrogenated at 50 parr for 24 hours. Air was bubbled through the solution and the Raney nickel was removed by filtering through a sintered glass funnel keeping the Raney nickel residue moist at all times. The ethanol and NH4OH were removed in vacuo and the oily residue dissolved in CH2Cl2 and washed with 10% aq, Na2CO3 (3×50 mL). The organic layer was dried over anhydrous Na2SO4, filtered and the solvent removed in vacuo to give the product 12 as a clear oil without further purification (1.92 g, 95%), Rf=0.4 (1:10:89 NH4OH:MeOH:CHCl3); 1H NMR (CDCl3) d 4.65 (br s, 1H, NHCO), 3.14 (m, 6H, 3×CH2), 2.69 (t, 2H, CH2), 2.35 (t, 2H, CH2), 1.58-1.26 (m, 26H, 4×CH2, 6×CH3).

Provenance & Evidence