反应详情

温度

85 °C

To a suspension of 15.9 mmol 3-Fluoro-5-(Trifluoromethyl) benzoic acid in 20 ml toluene containing 2 drops of DMF was added 79.7 mmol thionylchloride at 0° C. The mixture was heated at 85° C. for 5 hours. The solvent was carefully removed in vacuo. The colorless liquid was dissolved in 25 ml dichloromethane and cooled to 0° C. 63.8 mmol diisopropylamine was added dropwise. The mixture was allowed to warm to RT. After 1 hour the solvent was removed in vacuo. The residue was taken in ethyl acetate and washed twice with water. The washings were extracted once with ethyl acetate. The combined organic phases were dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by chromatography (SiO2, heptane/ethyl acetate) to yield the title compound as a light yellow solid (85% yield). MS (m/e): 291.9 (M+, 100%)

1. customThe solvent was carefully removed in vacuo
2. dissolutionThe colorless liquid was dissolved in 25 ml dichloromethane
3. temperaturecooled to 0° C
4. temperatureto warm to RT
5. customAfter 1 hour the solvent was removed in vacuo
6. washwashed twice with water
7. extractionThe washings were extracted once with ethyl acetate
8. dry with materialThe combined organic phases were dried over sodium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. customThe residue was purified by chromatography (SiO2, heptane/ethyl acetate)