Hydrochloric Acid → HCID 69748516, compound

Participants

Reaction Steps

In a dry flask (3R,4R)-4-amino-3-[(S)-3-(4-fluoro-benzyl)-piperidine-1-carbonyl]-piperidine-1-carboxylic acid t-butyl ester (500 mg, 1.19 mmol) was dissolved in borane (50 mL of a 1M solution in tetrahydrofuran, 50 mmol). The reaction was stirred 19 hours. The reaction was poured into hydrochloric acid (70 mL of a 1M aqueous solution) and stirred vigorously for 4 hours. The reaction mixture was neutralized with saturated aqueous sodium bicarbonate. The layers were separated and the aqueous layer was extracted with ethyl acetate. The organic layers were combined, dried with magnesium sulfate, filtered and concentrated in vacuo. The mixture was purified by flash chromatography using 5-20% methanol in chloroform to give a yellow solid (371 mg, 77%). 1H NMR (300 MHz, CDCl3), δ: 7.08 (m, 2H), 6.97 (t, 2H, J=8), 4.08 (bs, 2H), 3.70 (bs, 1H), 3.34 (bs, 1H), 3.02 (bt, 1H, J=9), 2.68 (bm, 2H), 2.32 (bm, 7H), 1.98 (m, 1H), 1.75 (m, 5H), 1.44 (s, 9H), 0.89 (m, 1H).

Provenance & Evidence