Triethylamine → 1,1-Dimethylethyl (2S)-4-[(4-amino-2-chlorophenyl)methyl]-2-methyl-1-piperazinecarboxylate

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A mixture of 1,1-dimethylethyl (2S)-4-[(2-chloro-4-nitrophenyl)methyl]-2-methyl-1-piperazinecarboxylate (D103) (0.199 g, 0.538 mmol), triethylamine (0.75 mL, 5.38 mmol) and 5% Pt/C catalyst (0.134 g) in MeOH (5 mL) was hydrogenated at room temperature and atmospheric pressure for 3 h. The catalyst was removed by filtration and the filtrate was concentrated to give a colourless oil which was dissolved in DCM. The DCM solution was washed with water (×2) and brine, then dried and concentrated to give the crude product. Purification by column chromatography eluting with 10-40% EtOAc/pentane gave the title compound as a colourless oil (0.125 g). δH (CDCl3, 400 MHz) 7.19 (1H, d), 6.69 (1H, d), 6.54 (1H, dd), 4.18 (1H, br.s), 3.79 (1H, d), 3.70 (2H, br.s), 3.45 (2H, m), 3.07 (1H, td), 2.74 (1H, m), 2.60 (1H, m), 2.19 (1H, dd), 2.03 (1H, m), 1.45 (9H, s), 1.22 (3H, d). MS (ES): MH+ 340/342.

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