反应详情

A mixture of 2-bromo-4-fluoroaniline (10.0 g, 52.6 mmol), cyanoacetic acid (5.36 g, 63.1 mmol), N-[3-(dimethylamino)propyl]-N′-ethylcarbodiimide•hydrochloride (15.1 g, 78.9 mmol), 1H-1,2,3-benzotriazol-1-ol (10.6 g, 78.9 mmol), triethylamine (10.9 mL, 78.9 mmol) and N,N-dimethylformamide (150 mL) was stirred at room temperature for 16 hr. The mixture was diluted with ethyl acetate, washed with water, saturated aqueous sodium hydrogen carbonate solution and saturated brine, dried over anhydrous magnesium sulfate, and filtered through a pad packed with NH silica gel. The solvent was evaporated under reduced pressure, and the obtained residue was washed with hexane and collected by filtration to give the title compound (8.04 g, 59%) as a white solid.

1. washwashed with water, saturated aqueous sodium hydrogen carbonate solution and saturated brine
2. dry with materialdried over anhydrous magnesium sulfate
3. filtrationfiltered through a pad
4. customThe solvent was evaporated under reduced pressure
5. washthe obtained residue was washed with hexane
6. filtrationcollected by filtration