反应详情

1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI; 362 mg, 1.90 mmol) and DMAP (202 mg, 1.90 mmol) were added to a solution of (R)-4-benzyl-oxazolidin-2-one (333 mg, 1.90 mmol) and tetrahydrofuran-3-carboxylic acid (200 mg, 1.70 mmol) in CH2Cl2 (20 mL) at ambient temperature. The reaction mixture was stirred for 3 h at ambient temperature and water (20 mL) was added. The two layers were separated and the aqueous phase was extracted with CH2Cl2 (20 mL×3). The combined organic phases were washed with brine (50 mL×3), dried over anhydrous sodium sulfate and concentrated. The residue was purified by flash column chromatography on silica gel (CH2Cl2/EtOAc=100:2) to afford (R)-4-benzyl-3-((S)-tetrahydrofuran-3-carbonyl)oxazolidin-2-one (120 mg, 25% yield).

1. customThe two layers were separated
2. extractionthe aqueous phase was extracted with CH2Cl2 (20 mL×3)
3. washThe combined organic phases were washed with brine (50 mL×3)
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated
6. customThe residue was purified by flash column chromatography on silica gel (CH2Cl2/EtOAc=100:2)