反应详情

2-Chloro-4-fluoro-3-(trifluoromethyl)benzoic acid (0.560 g, 2.31 mmol), ammonium 1H-1,2,3-benzotriazol-1-olate (0.534 g, 3.47 mmol, prepared as described below), N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (0.643 g, 3.47 mmol), and N-ethyl morpholine (0.594 ml, 4.62 mmol) were stirred together in dichloromethane (30 ml) for a total of 3 hrs. Saturated aqueous sodium hydrogen carbonate (30 ml) was added and the mixture was stirred for 15 minutes. The organic layer was separated using a hydrophobic frit and then washed with 2N aqueous hydrogen chloride (2×50 ml). Separation of the organic layer, again using a hydrophobic frit, and evaporation in vacuo gave 2-chloro-4-fluoro-3-(trifluoromethyl)benzamide (0.493 g) as an off-white solid which was used without further purification in the subsequent step.

1. customThe organic layer was separated
2. washwashed with 2N aqueous hydrogen chloride (2×50 ml)
3. customSeparation of the organic layer
4. customa hydrophobic frit, and evaporation in vacuo