反应详情

温度

70 °C

To a solution of 200 mg of the N-[2-(3,5-dichloropyridin-2-yl)-2-oxoethyl]-2-(trifluoromethyl)benzamide prepared in Step 3 in Synthetic Example 10 and 199 mg of O-(tert-butyl)hydroxylamine hydrochloride in 2.6 ml of ethanol, 167 mg of pyridine was added, and the mixture was stirred at 70° C. for 18 hours. After completion of the reaction, the solvent was evaporated under reduced pressure, the resulting residue was mixed with 2 ml of water and extracted with ethyl acetate (2 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 207 mg of the desired product as a colorless resinous substance.

1. customAfter completion of the reaction
2. customthe solvent was evaporated under reduced pressure
3. additionthe resulting residue was mixed with 2 ml of water
4. extractionextracted with ethyl acetate (2 ml×2)
5. dry with materialdried over saturated aqueous sodium chloride
6. customanhydrous sodium sulfate, and the solvent was evaporated under reduced pressure
7. customThe resulting residue was purified by silica gel column chromatography