1,1-Dimethylethyl (3S)-4-azido-3-[(3-chloro-4-cyanophenyl)amino]butanoate → 1,1-Dimethylethyl (3S)-4-amino-3-[(3-chloro-4-cyanophenyl)amino]butanoate

Participants

Reaction Steps

PtO2 (0.98 g) in EtOH (100 mL) was reduced with H2 (40 psi) on a Parr shaker for 20 minutes. To this mixture was added a solution of 1,1-dimethylethyl (3S)-4-azido-3-[(3-chloro-4-cyanophenyl)amino]butanoate (25.5 g, 76 mmol) in EtOH (100 mL) and the reaction was shaken on a Parr shaker under H2 (35 psi) for 2.5 h. The reaction mixture was filtered through a pad Celite and concentrated. The residue was dissolved in CH2Cl2, washed with H2O, dried over MgSO4, filtered and the solvent removed. The residue was triturated with Et2O (75 mL), chilled, and filtered to afford the titled product (19.8 g, 84%). 1H-NMR (CD3OD) δ: 1.39 (9H, s), 2.39 (1H, m), 2.58 (1H, m), 2.73 (1H, m), 2.79 (1H, m), 3.97 (1H, m), 6.68 (1H, d, J=8 Hz), 6.84 (1H, s), 7.44 (1H, d, J=8.8 Hz). LC-MS (ES) m/e 310.6 (M+H)+.

Provenance & Evidence