反应详情

DMF (3 drops) and oxalyl chloride (2.55 ml) were added to a mixture of 4-fluoro-2-(trifluoromethyl)benzoic acid (5.50 g) and dichloromethane (50 ml), followed by stirring at room temperature for 3 hours. The reaction solution was added dropwise to a 2M methylamine-THF solution (17.3 ml) and a solution of triethylamine (5.55 ml) in dichloromethane (50 ml) under ice cooling, followed by stirring for 30 minutes and concentration under reduced pressure, addition of water and extraction with ethyl acetate. The organic layer was washed with water, saturated aqueous sodium bicarbonate solution and then saturated brine in this order, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was washed with diisopropylether to obtain 4-fluoro-N-methyl-2-(trifluoromethyl)benzamide (4.37 g) as a white solid.

1. stirringby stirring for 30 minutes
2. concentrationconcentration
3. additionunder reduced pressure, addition of water and extraction with ethyl acetate
4. washThe organic layer was washed with water, saturated aqueous sodium bicarbonate solution
5. dry with materialsaturated brine in this order, and dried over anhydrous magnesium sulfate
6. customthe solvent was evaporated under reduced pressure
7. washThe residue was washed with diisopropylether