反应详情

温度

25 °C

4-(p-Chlorophenyl)-2-(trifluoromethyl)-2-oxazolin-5-one (2.0 g, 7.59 mmol) and 2-bromo-4,4,4-trifluorocrotononitrile (0.81 g, 4.05 mmol) are dissolved in acetonitrile (10 mL). To the resulting yellow solution triethylamine (0.45 g, 4.46 mmol) is added dropwise while the reaction flask is cooled with a water bath. After stirring at 25° C. overnight, the reaction mixture is poured into water. The aqueous layer is extracted with ethyl acetate and the combined organic extracts are washed sequentially with water, 5% sodium thiosulfate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to give a yellow solid. The solid is chromatographed using silica gel and eluted with hexane/ethyl acetate 3:1 to yield the title compound as yellow crystals (1.26 g, mp 208° C.)

1. temperatureis cooled with a water bath
2. extractionThe aqueous layer is extracted with ethyl acetate
3. washthe combined organic extracts are washed sequentially with water, 5% sodium thiosulfate solution and brine
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated in vacuo
6. customto give a yellow solid
7. customThe solid is chromatographed
8. washeluted with hexane/ethyl acetate 3:1