反应详情

温度

0 °C

1.4 ml (18.2 mmol) of dry dimethylformamide were introduced into 50 ml of methylene chloride and, at 0° C. under an inert gas atmosphere, 2.0 ml (28.2 mmol) of oxalyl chloride in 70 ml of methylene chloride were added dropwise. The mixture was stirred at 0° C. for 30 min and then the solvent was removed under reduced pressure. The remaining white salt (highly hygroscopic) was suspended in 120 ml of THF/acetonitrile (1:1) and cooled to -30° C. To this were added dropwise 5.6 g (16 mmol) of 3-[3-(2-naphthalenesulfonylamino)oxazolidin-5-on-4-yl]propionic acid together with 1.07 ml (16 mmol) of pyridine in 30 ml of THF, and the mixture was then stirred at -20° C. for 20 min. The mixture was subsequently cooled to -75° C., 307 mg of cuprous iodide were added, then a solution of 5.6 g (21.8 mmol) of lithium tri-tert-butoxyaluminum hydride in 20 ml of THF was slowly added dropwise, and the mixture was stirred at this temperature for 1 h. Quenching was then carried out at -75° C. with 30 ml of 2N hydrochloric acid and, after the mixture had warmed to room temperature, the solvent was removed under reduced pressure, the residue was taken up in methylene chloride, the Cu salts were removed by filtration, and the organic phase was washed three times with water, dried over magnesium sulfate and concentrated under reduced pressure. 5.4 g of slightly impure 3-[3-(2-naphthalenesulfonylamino)oxazolidin-5-on-4-yl]propanal were obtained which were rapidly processed further because of the low stability.

1. additionwere added dropwise
2. customthe solvent was removed under reduced pressure
3. temperaturecooled to -30° C
4. stirringthe mixture was then stirred at -20° C. for 20 min
5. temperatureThe mixture was subsequently cooled to -75° C.
6. stirringthe mixture was stirred at this temperature for 1 h
7. customQuenching
8. customwas then carried out at -75° C. with 30 ml of 2N hydrochloric acid
9. temperatureafter the mixture had warmed to room temperature
10. customthe solvent was removed under reduced pressure
11. customthe Cu salts were removed by filtration
12. washthe organic phase was washed three times with water
13. dry with materialdried over magnesium sulfate
14. concentrationconcentrated under reduced pressure