Hydroxyamine hydrochloride → N-[2-(3,5-dichloropyridin-2-yl)-2-(hydroxyimino)ethyl]-2-(trifluoromethyl)benzamide

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Reaction Steps

To 2.8 g of N-[2-(3,5-dichloropyridin-2-yl)-2-oxoethyl]-2-(trifluoromethyl)benzamide in 19 ml of ethanol, 1.0 g of hydroxylamine hydrochloride was added, and the mixture was stirred at room temperature for 96 hours. After completion of the reaction, the solvent was evaporated under reduced pressure, the resulting residue was mixed with 50 ml of water and extracted with ethyl acetate (50 ml×2), the resulting organic layers were combined, dried over saturated aqueous sodium chloride and then anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography using ethyl acetate-hexane (with a gradient of from 5:95 to 50:50) as the eluent to obtain 2.8 g of the desired product as pale yellow crystals.

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