反应详情

4-[3-(3,5-Bis(trifluoromethyl)phenyl)-1-(4-cyclohexylphenyl)ureidomethyl]benzoic acid (0.22 g, 0.39 mmol) was dissolved in DMF (3 mL) and 1-hydroxy-7-azabenzotriazole (0.06 g, 0.47 mmol) and EDAC (0.09 g, 1.2 mmol) were added. The mixture was stirred for 1.5 hour, and (R)-isoserine ethyl ester (0.10 g, 0.59 mmol) and diisopropylethylamine (0.10 mL, 0.59 mmol) in DMF (2 mL) were added. The mixture was stirred at room temperature for 16 hours. The reaction mixture was diluted with water (10 mL) and extracted with ethyl acetate (25 mL). The aqueous phase was extracted with ethyl acetate (10 mL). The combined organic phases were washed with hydrochloric acid (0.2 N, 3×10 mL) and water:saturated sodium chloride (1:1), dried (magnesium sulphate) and concentrated in vacuo. The residue was purified by column chromatography (35 g silica gel) using ethyl acetate and n-heptane (6:4) as eluent to afford 0.27 g of (R)-3-{4-[3-(3,5-bis(trifluoromethyl)phenyl)-1-(4-cyclohexylphenyl)ureidomethyl]benzoylamino}-2-hydroxypropionic acid ethyl ester.

1. stirringThe mixture was stirred at room temperature for 16 hours
2. extractionextracted with ethyl acetate (25 mL)
3. extractionThe aqueous phase was extracted with ethyl acetate (10 mL)
4. washThe combined organic phases were washed with hydrochloric acid (0.2 N, 3×10 mL) and water
5. dry with materialsaturated sodium chloride (1:1), dried (magnesium sulphate)
6. concentrationconcentrated in vacuo
7. customThe residue was purified by column chromatography (35 g silica gel)