反应详情

To a solution of ethyl (±) 4-carboxy-3-phenylbutanoate (1.00 g, 4.23 mmole) in dry DMF (20 mL) was added HOBt (686 mg, 5.08 mmole), Et3N (1.77 mL, 12.69 mmole), and EDC (974 mg, 5.08 mmole). After 30 min, L-serine methyl ester hydrochloride (790 mg, 5.08 mmole) was added. After 48 hr, the mixture was concentrated under reduced pressure. The residue was taken up in CH2Cl2 (50 mL) and washed sequentially with 20 mL each H2O, saturated NaHCO3, and H2O. The organic layer was dried over MgSO4, filtered, and concentrated under reduced pressure. The residue was chromatographed on silica gel (EtOAc) to give the title compound (961 mg, 67%) as a yellow oil: MS (ES) m/e 338 (M+H)+.

1. waitAfter 48 hr
2. concentrationthe mixture was concentrated under reduced pressure
3. washwashed sequentially with 20 mL each H2O, saturated NaHCO3, and H2O
4. dry with materialThe organic layer was dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was chromatographed on silica gel (EtOAc)