反应详情

温度

0 °C

Dioxane (250 mL) is saturated with ammonia and cooled down to 0° C. A solution of benzyl-4-(chlorosulfonyl)piperidine-1-carboxylate (10 g; 31.5 mmol; 1 eq) in dioxane (25 mL) is added dropwise over 10 min. The reaction mixture is stirred at room temperature for 3 h while keeping ammonia bubbling. The suspension is filtered through a short plug of silica using dioxane as eluent and the resulting solution is concentrated in vacuo to give a colourless oil. The oil is taken up in MeOH and concentrated in vacuo to give a white foam which is crystallised from EtOAc and Et2O to afford 8.1 g (86%) of the title compound as a white solid. 1H NMR (DMSO-d6) δ 7.40-7.29 (m, 5H), 6.79 (s, 2H), 5.08 (s, 2H), 4.10 (br d, J=13.3 Hz, 2H), 3.05 (tt, J=11.9, 3.6 Hz, 1H), 2.95-2.75 (m, 2H), 2.0 (dd, J=1.8, 11.5 Hz, 2H), 1.46 (dq, J=12.5, 4.4 Hz, 2H). HPLC (max plot) 82%; Rt 3.55 min.

1. filtrationThe suspension is filtered through a short plug of silica
2. concentrationthe resulting solution is concentrated in vacuo
3. customto give a colourless oil
4. concentrationconcentrated in vacuo
5. customto give a white foam which
6. customis crystallised from EtOAc and Et2O