反应详情

A solution of sodium (5R,6S)-6-[(1R)-1-hydroxyethyl]-3-(hydroxyphenyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (106 mg) in dry dimethylformamide (4.5 ml) was cooled with ice, and thereto pivaloyloxymethyl iodide (123 mg) was added. The mixture was stirred for 1 hour at the same temperature. Ethyl acetate and ice water were added to the reaction solution, and the mixture was separated with a separating funnel. After the organic layer was washed with a cold saturated aqueous sodium chloride solution (4 times), it was dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and then the residue was purified by silica gel column chromatography (chloroform/methanol) to give [(2,2-dimethylpropanoyl)oxy]methyl(5R,6S)-6-[(1R)-1-hydroxyethyl]-3-(hydroxyphenyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (36 mg).

1. customthe mixture was separated with a separating funnel
2. washAfter the organic layer was washed with a cold saturated aqueous sodium chloride solution (4 times), it
3. dry with materialwas dried over anhydrous magnesium sulfate
4. customThe solvent was removed under reduced pressure
5. customthe residue was purified by silica gel column chromatography (chloroform/methanol)