反应详情

To an ice-cold solution of tert-butyl 4-hydroxybutylcarbamate (5 g, 26.41 mmol) in dichloromethane (200 mL) was added triphenylphosphine (10.38 g, 39.61 mmol) followed by carbon tetrabromide (13.15 g, 39.61 mmol) at 0° C. The reaction mixture was stirred at room temperature for 18 h. The solvent was removed under reduced pressure and the residue was purified by column chromatography (60-120 mesh silica gel) using 10% ethyl acetate in pet-ether to give tert-butyl 4-bromobutylcarbamate (4.2 g, 63.3%) as a light green liquid. 1H NMR (400 MHz, CDCl3) δ ppm 4.53 (1H, s), 3.45-3.41 (2H, m), 3.18-3.13 (2H, m), 1.93-1.83 (2H, m), 1.68-1.61 (2H, m), 1.47 (9H, s).

1. customThe solvent was removed under reduced pressure
2. customthe residue was purified by column chromatography (60-120 mesh silica gel)