반응 #1340

반응 방정식

1-Bromo-1-chloro-2,2,2-trifluorethane

senecialdehyde

sodium t-butoxide

→

5-bromo-5-chloro-4-hydroxy-2-methyl-6,6,6-trifluorohex-2-ene

수율 73.8%

용매

Tetrahydrofuran

반응 조건

후처리

1. 1
   workup.STIRRINGthe mixture was stirred at -60° C. for a further 30 minutes
2. 2
   기타On completion of reaction
3. 3
   기타the mass was quenched by controlled addition of saturated ammonium chloride solution (120 ml)
4. 4
   workup.ADDITIONHexane (500 ml) was added to the mixture
5. 5
   기타the aqueous phase was separated
6. 6
   추출extracted with further hexane (2×500 ml)
7. 7
   세척The combined organics were washed with brine (2×100 ml)
8. 8
   기타Drying
9. 9
   농축(sodium sulphate) and concentration in vacuo

실험 절차

Tetrahydrofuran (230 ml) and sodium t-butoxide (57.6 g; 40% w/v solution in dimethylformamide) was charged to a split-neck reaction flask, and cooled to -60° C. with stirring. 1-Bromo-1-chloro-2,2,2-trifluorethane (47.6 g) and senecialdehyde (20.9 g) were charged simultaneously over 25 minutes, then the mixture was stirred at -60° C. for a further 30 minutes. On completion of reaction, the mass was quenched by controlled addition of saturated ammonium chloride solution (120 ml). Hexane (500 ml) was added to the mixture, then the aqueous phase was separated and extracted with further hexane (2×500 ml). The combined organics were washed with brine (2×100 ml) and then water (3×20 ml). Drying (sodium sulphate) and concentration in vacuo then gave the product 5-bromo-5-chloro-4-hydroxy-2-methyl-6,6,6-trifluorohex-2-ene as a mobile yellow oil (50.1 g, 70% yield).

출처