反应详情

3-Benzyloxycarbonylamino-2,2-difluoropropionic acid methyl ester (3.3 g, 12.1 mmol), THF (50 ml), methanol (50 ml) and 1 N sodium hydroxide solution (50ml) were mixed and stirred for 16 hours at room temperature. After adjusting the pH to acidic reaction and removal of organic solvent by evaporation, the aqueous residue was extracted twice with ethyl acetate. The combined organic layers were washed twice with 5% brine, dried over magnesium sulphate and filtered through a short silica column before concentration in vacuo to afford 2.6 g (83%) of 3-benzyloxycarbonylamino-2,2-difluoropropionic acid as an oil.

1. customto acidic reaction and removal of organic solvent
2. customby evaporation
3. extractionthe aqueous residue was extracted twice with ethyl acetate
4. washThe combined organic layers were washed twice with 5% brine
5. dry with materialdried over magnesium sulphate
6. filtrationfiltered through a short silica column before concentration in vacuo