反应详情

温度

-78 °C

36.7 g (207 mmol) of (S)-4-benzyloxazolidin-2-one in 800 ml of THF are introduced into a round-bottomed flask under a stream of nitrogen. The reaction medium is cooled to −78° C. and 83 ml (207 mmol) of 2.5M n-butyllithium hexane are added dropwise. 30 minutes later, 25.4 g (207 mmol) of ethoxyacetyl chloride obtained in Example 81(b) are added, at −78° C. The reaction medium is stirred for 24 hours and then poured into saturated aqueous sodium chloride solution and extracted with ethyl acetate. The organic phase is dried over magnesium sulfate, filtered and evaporated. After purification by chromatography on a column of silica eluted with a heptane/ethyl acetate mixture (6/4), 30.6 g (56%) of the expected product are obtained in the form of an orange-colored oil.

1. extractionextracted with ethyl acetate
2. dry with materialThe organic phase is dried over magnesium sulfate
3. filtrationfiltered
4. customevaporated
5. customAfter purification by chromatography on a column of silica
6. washeluted with a heptane/ethyl acetate mixture (6/4), 30.6 g (56%) of the expected product
7. customare obtained in the form of an orange-colored oil