反应详情

In a mixture of 10 ml of water and 50 ml of chloroform were suspended 3.79 g of methyl phenylalanyltyrosinate hydrochloride and 0.53 g of sodium carbonate. To the mixture was added dropwise 1.75 g of 4-methoxybenzoylchloride in parallel with 10 ml of sodium carbonate solution (0.75 g), while stirring and cooling with ice. The mixture was stirred for 2 hours and the chloroform layer was collected. The layer was washed with 5% hydrochloric acid and water, dried and concentrated to dryness. The residue was crystallized from ethyl acetate to give 3.9 g of methyl N-(4-methoxybenzoyl)-phenylalanyltyrosinate with a mp. 195°-197° C. in a yield of 82%. Analysis, calculated for C27H28O6N2 : C, 68.05; H, 5.92; N, 5.88; found C, 68.42; H, 6.08; N, 5.74.

1. temperaturecooling with ice
2. stirringThe mixture was stirred for 2 hours
3. customthe chloroform layer was collected
4. washThe layer was washed with 5% hydrochloric acid and water
5. customdried
6. concentrationconcentrated to dryness
7. customThe residue was crystallized from ethyl acetate