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1.8 g (4.38 mmol) of benzyl (3R)-3-t-butoxycarbonylamino-4-(3-cyanophenoxy)butyrate 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 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. After the treatment with ethyl acetate as the extractant in an ordinary manner, the crude product was obtained, which was purified by the silica gel column chromatography to obtain the title compound.

1. customThe solvent was evaporated
2. dissolutionthe oily residue was dissolved in 5 ml of dichloromethane
3. temperatureunder cooling with ice, and they
4. stirringwere stirred at room temperature overnight
5. customwhich was purified by the silica gel column chromatography