反应详情

To sodium (5R,6S)-3-(3-fluoro-4-methoxyphenyl)-6-[(1R)-1-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (100 mg) in DMF (3 mL) was added at 0° C. pivaloyloxymethyl iodide (77 mg), and the mixture was stirred for 15 minutes. To the reaction mixture was added diethyl ether (50 mL), and the mixture was washed with saturated brine (50 mL×3times), dried over magnesium sulfate, filtered, and the solvent was removed in vacuo. The residue was purified under silica gel column chromatography (chloroform:methanol=100:0˜100:3) to give [(2,2-dimethylpropanoyl)oxy]methyl (5R,6S)-3-(3-fluoro-4-methoxyphenyl)-6-[(1R)-1-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (70 mg, 55%).

1. washthe mixture was washed with saturated brine (50 mL×3times)
2. dry with materialdried over magnesium sulfate
3. filtrationfiltered
4. customthe solvent was removed in vacuo
5. customThe residue was purified under silica gel column chromatography (chloroform:methanol=100:0˜100:3)