反应详情

N,O-Dimethylhydroxylamine hydrochloride (5.37 g) was added to a mixture of 3-methoxy-4-(trifluoromethyl)benzoic acid (11.0 g), 1-hydroxybenzotriazole (6.76 g), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (9.59 g) and N,N-diisopropylethylamine (9.6 ml) in dichloromethane (200 ml), and the whole was stirred at room temperature for 18 hours. Saturated aqueous sodium hydrogen carbonate solution was added to the mixture and the organic layer was separated, dried over magnesium sulfate, and evaporated in vacuo. The residue was purified by column chromatography on silica gel with 25% of ethyl acetate in hexane as an eluent to give 3-methoxy-N-methoxy-N-methyl-4-(trifluoromethyl)-benzamide (12.0 g) as a colorless oil.

1. customthe organic layer was separated
2. dry with materialdried over magnesium sulfate
3. customevaporated in vacuo
4. customThe residue was purified by column chromatography on silica gel with 25% of ethyl acetate in hexane as an eluent