反应详情

温度

70 °C

Sodium hydride (4.5 g.; 57% in mineral oil) is placed under a nitrogen atmosphere and the mineral oil removed with petroleum ether. Dimethylsulfoxide (30 ml.) is then added and the mixture is stirred at 70° C. for two hours and then cooled to 10° C. Methyltriphenylphosphonium bromide (35.7 g.) dissolved in dimethylsulfoxide (50 ml.) is added dropwise under nitrogen to afford a yellowish-orange ylide solution. 1-Chloro-3-acetoxy-2-propanone (15 g.) in dimethylsulfoxide (20 ml.) is then added and the reaction mixture is stirred until the color of the ylide disappears and then is stirred an additional hour at room temperature. The reaction mixture is dissolved in hexane (200 ml.) and washed three times with water. The organic phase is filtered to remove triphenylphosphine oxide and then dried over magnesium sulfate. The solvent is evaporated and the residue is distilled under vacuum to afford 1-chloro-2-methylene-3-acetoxypropane.

1. customthe mineral oil removed with petroleum ether
2. additionDimethylsulfoxide (30 ml.) is then added
3. temperaturecooled to 10° C
4. dissolutionMethyltriphenylphosphonium bromide (35.7 g.) dissolved in dimethylsulfoxide (50 ml.)
5. additionis added dropwise under nitrogen
6. customto afford a yellowish-orange ylide solution
7. stirringthe reaction mixture is stirred until the color of the ylide
8. stirringis stirred an additional hour at room temperature
9. washwashed three times with water
10. filtrationThe organic phase is filtered
11. customto remove triphenylphosphine oxide
12. dry with materialdried over magnesium sulfate
13. customThe solvent is evaporated
14. distillationthe residue is distilled under vacuum