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

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Reaction Steps

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 (200ml). 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).

Provenance & Evidence