Dimethylformamide → 3-{4-[1-(4-Tert-butylphenyl)-3-(4-trifluoromethoxyphenyl)ureidomethyl]benzoylamino}-2-hydroxypropionic acid ethyl ester

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To a solution of [1-(4-tert-butylphenyl)-3-(4-trifluoromethoxyphenyl)ureidomethyl]benzoic acid (1.0 g, 2.06 mmol) in DMF (1 mL) and DCM (10 mL) was added 1-hydroxy-7-azabenzotriazole (0.33 g, 2.47 mmol). After stirring for 1 hour at room temperature, EDAC (0.47 g, 2.47 mmol), (RS)-isoserine ethyl ester hydrochloride (0.52 g, 3.09 mmol) and diisopropylethylamine (1.1 mL, 6.18 mmol) were added, successively. After stirring for 17 hours at ambient temperature the reaction mixture was partitioned between water, brine and ethyl acetate. The aqueous phase was further extracted with ethyl acetate. The combined organic phases were washed with water and brine. After drying (magnesium sulphate) and filtration, the organic phase was evaporated in vacuo. The residue was purified by column chromatography on silica gel eluting with a mixture of toluene and ethyl acetate (6:4). This afforded 1.2 g (97%) of (RS)-3-{4-[1-(4-tert-butylphenyl)-3-(4-trifluoromethoxyphenyl)ureidomethyl]benzoylamino}-2-hydroxypropionic acid ethyl ester as an oil.

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