反应详情

温度

80 °C

To a Suspension of 0.9 g sodium hydride (hexane washed) in 15 mL of N,N-dimethylformamide, a solution of 3.05 g of 2-oxazolidone in 15 mL of N,N-dimethylformamide was added at room temperature. As a white precipitate formed, the mixture was heated slowly to 80° C. over 30 minutes and kept at 80° C. for another 30 minutes. The mixture was cooled to room temperature, and a solution of 8.5 g of the compound of Example 3 in 20 mL of N,N-dimethylformamide was added in one portion. The resulting solution was stirred at 25° C. for 12 hours, poured into 50 mL water and extracted with ethyl acetate. The organic layer was washed well with water, dried over magnesium sulfate, filtered, and the filtrate evaporated to leave a yellow oil. Silica gel flash chromatography (4:1 hexane-ethyl acetate eluant) afforded after evaporation of the eluant 7.5 g of the subject compound as a yellow oil.

1. customAs a white precipitate formed
2. temperatureThe mixture was cooled to room temperature
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed well with water
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. customthe filtrate evaporated
8. customto leave a yellow oil
9. customafter evaporation of the eluant 7.5 g of the subject compound as a yellow oil