反应详情

10.56 Grams of methyl acetoacetate were dissolved in 14 ml of water, and 13.9 g of a 28% aqueous sodium hydroxide solution were added thereto by drops while cooling the mixture to 35° C. or less. After having been stirred at 30°-35° C. for 3 hours, the mixture was adjusted to pH 7.5 with a concentrated aqueous hydrochloric acid solution. Thereafter, 0.6 g of sodium acetate and 2.3 g of tetrabutylammonium bromide were added thereto and then 43.4 g of a toluene solution containing 34.9% of 3-[4-(1,1,2,2-tetrafluoroethoxy)phenylthio]propanal were added thereto. The mixture was stirred at 45°-50° C. for 6 hours and then at room temperature for 12 hours. After the mixture had been neutralized with a concentrated aqueous hydrochloric acid solution, the organic layer was separated, washed with a saturated aqueous sodium chloride solution and then dried over anhydrous magnesium sulfate. Removing the solvent from the layer under reduced pressure gave 21.88 g of crude 4-hydroxy-6-[4-(1,1,2,2-tetrafluoroethoxy)phenylthio]-2-hexanone (purity: 70.9%, yield: 83.9%).

1. temperatureby drops while cooling the mixture to 35° C. or less
2. additionwere added
3. stirringThe mixture was stirred at 45°-50° C. for 6 hours
4. waitat room temperature for 12 hours
5. customthe organic layer was separated
6. washwashed with a saturated aqueous sodium chloride solution
7. dry with materialdried over anhydrous magnesium sulfate
8. customRemoving the solvent from the layer under reduced pressure