反应详情

Under argon, a solution containing 2.70 g (8.67 mmol) of the compound obtained in Step B and 1.45 g (8.67 mmol) of AIBN in 80 ml of toluene is brought to reflux. After stirring for 20 minutes, 4.67 ml (17.35 mmol) of tributyltin hydride in 100 ml of toluene are added to the reaction mixture, which is maintained at reflux for 24 hours. After returning to room temperature and evaporation to dryness, the residue is then hydrolysed and subsequently extracted with ethyl acetate. The organic phase is dried over magnesium sulphate, concentrated and purified by flash chromatography over silica gel. (eluant: petroleum ether/ethyl acetate, 95:5) to yield the title product in the form of a yellow oil.

1. temperatureto reflux
2. temperatureis maintained
3. temperatureat reflux for 24 hours
4. customAfter returning to room temperature
5. customevaporation to dryness
6. extractionhydrolysed and subsequently extracted with ethyl acetate
7. dry with materialThe organic phase is dried over magnesium sulphate
8. concentrationconcentrated
9. custompurified by flash chromatography over silica gel