Ammonia → 2-hydroxy-4-(trifluoromethyl)benzamide

Thionyl chloride (2.7 mL) and N,N-dimethylformamide (0.1 mL) were added to a toluene (50.0 mL) solution of 4-trifluoromethylsalicylic acid (5.0 g), and the reaction mixture was refluxed for 30 minutes. The reaction mixture was left to cool. The reaction mixture was then added dropwise to aqueous ammonia (50.0 mL) under ice cooling, and the reaction mixture was stirred at the same temperature for 10 minutes. The pH of the reaction mixture was adjusted to 3 with concentrated hydrochloric acid, and the reaction mixture was then extracted with ethyl acetate. The organic layer was sequentially washed with water and a saturated brine and then dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (eluate; n-hexane:ethyl acetate=100:0 to 50:50). The title compound (1.84 g) was obtained as pale beige crystals.

1. temperaturethe reaction mixture was refluxed for 30 minutes
2. waitThe reaction mixture was left
3. temperatureto cool
4. extractionthe reaction mixture was then extracted with ethyl acetate
5. washThe organic layer was sequentially washed with water
6. dry with materiala saturated brine and then dried over anhydrous sodium sulfate
7. distillationThe solvent was distilled off under reduced pressure
8. customThe residue was purified by silica gel column chromatography (eluate; n-hexane:ethyl acetate=100:0 to 50:50)

ORD record

ord-d5220478f95b4a688fdd5568ecff1681

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08383839B2