Nitric Acid → HCID 178526837, compound

Temperature

50 °C

2-Hydroxy-3-(trifluoromethyl)pyridine (3.0 g) was added to conc. sulfuric acid (18 mL) under ice-cooling, and the mixture was stirred at the same temperature for 5 min. Fuming nitric acid (90-95%, 7 mL) was added dropwise over 5 min, and the mixture was allowed to return to room temperature over 2 hr, heated to 50° C. and stirred for 3 hr. After cooling to room temperature, the reaction mixture was poured into ice (200 g), and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The precipitate was washed with diisopropyl ether to give the title compound as a solid (yield 2.7 g, 69%).

1. temperaturecooling
2. waitto return to room temperature over 2 hr
3. stirringstirred for 3 hr
4. temperatureAfter cooling to room temperature
5. extractionthe mixture was extracted with ethyl acetate
6. washThe extract was washed with saturated brine
7. dry with materialdried over anhydrous magnesium sulfate
8. concentrationconcentrated under reduced pressure
9. washThe precipitate was washed with diisopropyl ether

ORD record

ord-88d492a5e242401fbc7ef19574437c3b

Source dataset

uspto-grants-2009_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07498337B2