反应详情

36.0 g (316 mmol) of (S)-1,1,1-trifluoro-propan-2-ol (CAS: 3539-97-7) was added to a cold (0 to 5° C.) suspension of 17.0 g (425 mmol) of NaH (pract., 60%) in 200 ml of dioxane. The suspension was stirred at room temperature during 0.5 h then cooled (0 to 5° C.) and a solution of 20.0 g (143 mmol) of 2-fluoro-benzoic acid in 100 ml of dioxane was added. The mixture was stirred during 0.5 h at room temperature and during 140 h under reflux. The mixture was poured into 800 ml of water, washed with 300 ml of MTBE, then acidified to pH 2 with hydrochloric acid and the product was extracted with MTBE. The solvent was concentrated in vacuo and the residue was crystallized from ethanol/water to provide 27.3 g (82%) of the title compound as a white solid. MS (m/e): 234.1 [M]+.

1. temperaturethen cooled (0 to 5° C.)
2. stirringThe mixture was stirred during 0.5 h at room temperature and during 140 h
3. temperatureunder reflux
4. washwashed with 300 ml of MTBE
5. extractionthe product was extracted with MTBE
6. concentrationThe solvent was concentrated in vacuo
7. customthe residue was crystallized from ethanol/water