反应详情

n-Propanol (2 ml) and ethoxyamine hydrochloride (0.18 g, 1.8 mmol) were added to 2-(2,5-dimethylphenoxy-methyl)phenyl 1-methylpyrazol-5-yl ketone (0.20 g, 0.6 mmol), and the mixture was stirred under reflux for 3 days. After completion of the reaction, water (100 ml) was added, and the mixture was extracted with dichloromethane. The dichloromethane layer was dried over anhydrous magnesium sulfate and concentrated under reduced pressure, and the residue was purified by silica gel chromatography (ethyl acetate/n-hexane) to give isomer A (0.11 g, 50.4%, as colorless crystals) and isomer B (0.10 g, 45.9%, as colorless crystals) of 2-(2,5-dimethylphenoxymethyl)phenyl 1-methylpyrazol-5-yl ketone O-ethyloxime.

1. temperatureunder reflux for 3 days
2. additionwas added
3. extractionthe mixture was extracted with dichloromethane
4. dry with materialThe dichloromethane layer was dried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customthe residue was purified by silica gel chromatography (ethyl acetate/n-hexane)