Hydrochloric Acid → 1-(2-Fluoropyridin-4-yl)-2-(3-trifluoromethylphenyl)ethane-1,2-dione-1-oxime

To a mixture of 2-(2-fluoropyridin-4-yl)-1-(3-trifluoromethylphenyl)ethanone (10.80 g, 0.038 mole) in ethanol (200 mL), at -10° C., under argon, was added tert-butylnitrite (5.0 mL, 0.042 mol) followed by hydrogen chloride (12.2 mL, 2.5M in ethanol, 0.031 mole) dropwise while maintaining the temperature below -5° C. Upon completion of addition, the reaction was allowed to warm to room temperature for 2 hours. The reaction was concentrated in vacuo, diluted with water (100 mL), basified with saturated sodium bicarbonate (200 ml). This mixture was then extracted with ethyl acetate (1×600 mL, 2×300 mL). The organic layers were combined, washed with water (300 mL), washed with brine (300 mL), dried over anhydrous sodium sulfate, filtered and concentrated to an oil (11.4 g).

1. temperaturewhile maintaining the temperature below -5° C
2. additionUpon completion of addition
3. concentrationThe reaction was concentrated in vacuo
4. additiondiluted with water (100 mL)
5. extractionThis mixture was then extracted with ethyl acetate (1×600 mL, 2×300 mL)
6. washwashed with water (300 mL)
7. washwashed with brine (300 mL)
8. dry with materialdried over anhydrous sodium sulfate
9. filtrationfiltered
10. concentrationconcentrated to an oil (11.4 g)

ORD record

ord-85fe94707c474649a077571ff2c3f49e

Source dataset

uspto-grants-2000_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06083949