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温度

0 °C

To a solution of (3R,4R)-3-[1-methyl-1-(4-nitrobenzyloxycarbonyloxy)ethyl]-4-(2-oxoethyl)azetidin-2-one (9 mg) in acetone (1 ml) was added 2 N Jones reagent (60 μl) at 0° C. and the mixture was stirred at 0° C. for 30 minutes. After addition of isopropyl alcohol (100 μl), the mixture was evaporated in vacuo. The residue was taken up in chloroform (20 ml) and washed with brine. The aqueous layer was extracted with chloroform (5 ml). The combined organic layers were washed with aqueous saturated sodium chloride, dried over magnesium sulfate, and evaporated to give {(2R,3R)-3-[1-methyl-1-(4-nitrobenzyloxycarbonyloxy)ethyl]-4-oxo-azetidin-2-yl}acetic acid (7 mg).

1. customthe mixture was evaporated in vacuo
2. washwashed with brine
3. extractionThe aqueous layer was extracted with chloroform (5 ml)
4. washThe combined organic layers were washed with aqueous saturated sodium chloride
5. dry with materialdried over magnesium sulfate
6. customevaporated