反应详情

温度

0 °C

1.8 g (4.38 mmol) of benzyl (3R)-3-t-butoxycarbonylamino-4-(3-cyanophenoxy)butanoate was dissolved in 20 ml of 4 N solution of hydrogen chloride in dioxane, and the solution was stirred at 0° C. for 6 hours. The solvent was evaporated, and the obtained oily residue was dissolved in 5 ml of dichloromethane. 1.09 g (6.58 mmol) of 4-cyanobenzoyl chloride and 1.22 ml (8.76 mmol) of triethylamine were added to the solution under cooling with ice, and they were stirred at room temperature overnight. The reaction mixture was treated with ethyl acetate as the extractant in an ordinary manner to obtain the crude product. After the silica gel column chromatography, the title compound was obtained.

1. customThe solvent was evaporated
2. dissolutionthe obtained oily residue was dissolved in 5 ml of dichloromethane
3. temperatureunder cooling with ice, and they
4. stirringwere stirred at room temperature overnight
5. customto obtain the crude product