反应详情

In 100.4 g of acetic acid, 25.1 g (0.1 mole) of N-benzyloxycarbonyl-L-aspartic anhydride was suspended and 27.7 g (0.1 mole) of L-phenylalanine methyl ester sulfate was added at 10°-15° C. Successively 11.1 g (0.105 mole) of sodium carbonate was added at the same temperature. The reaction was carried out for 4 hours with stirring at the same temperature. Thereafter 75.3 g of water was added and cooled to 0°-5° C. Precipitated crystals were filtered, washed and dried. Crystals of N-benzyloxycarbonyl-α-L-aspartyl-L-phenylalanine methyl ester were obtained. The yield was 29.9 g (69.9% yield on L-phenylalanine methyl ester sulfate).

1. temperaturecooled to 0°-5° C
2. customPrecipitated crystals
3. filtrationwere filtered
4. washwashed
5. customdried