反应详情

In 28.6 g of acetic acid, 16.1 g (0.1 mole) of N-formyl L-aspartic acid was suspended and 10.2 g (0.1 mole) of acetic anhydride was added. The mixture was warmed to 50°-55° C. and stirred for 5 hours at the same temperature. After finishing the reaction, the resulting mixture was cooled to 15°-20° C. and then 9.2 g (0.11 mole) of sodium acetate and 20.5 g (0.095 mole) of L-phenylalanine methyl ester hydrochloride were successively added at the same temperature. The reaction was carried out for 4 hours with stirring at the same temperature. The reaction mixture was then concentrated and 57.2 g of water was added and cooled to 10°-15° C. Precipitated crystals were filtered, washed and dried. Crystals of N-formyl-α-L-aspartyl-L-phenylalanine methyl ester thus obtained were 28.2 g. The crystals were analyzed by high performance liquid chromatography to give a ratio of α-isomer:β-isomer of 81.0:19.0. The crystals were purified with a conventional method to give high purity crystals of N-formyl-α-L-aspartyl-L-phenylalanine methyl ester. The yield was 20.8 g (68.0% yield on L-phenylalanine methyl ester hydrochloride).

1. temperatureThe mixture was warmed to 50°-55° C.
2. customthe reaction
3. temperaturethe resulting mixture was cooled to 15°-20° C.
4. waitThe reaction was carried out for 4 hours
5. stirringwith stirring at the same temperature
6. concentrationThe reaction mixture was then concentrated
7. addition57.2 g of water was added
8. temperaturecooled to 10°-15° C
9. customPrecipitated crystals
10. filtrationwere filtered
11. washwashed
12. customdried