反应详情

(N,N,N′,N′-Tetramethyl-o-(1h-benzotriazol-1-yl)uronium tetrafluoroborate (6.95 g, 21.64 mmol) was added to a solution of 5-bromo-2-(6-chloropyridin-3-yloxy)-4-fluorobenzoic acid (5.00 g, 14.43 mmol) and diethylamine (8.00 mL, 77 mmol) in DMF (70 mL) at 0° C. The reaction was stirred 1.5 hours before being quenched with saturated sodium bicarbonate (100 mL). The reaction mixture was diluted with water (50 mL) and extracted with EtOAc (3×50 mL). The combined organic extracts were washed with saturated aqueous ammonium chloride, water, 10% aqueous sodium carbonate, saturated aqueous sodium chloride, and dried over sodium sulfate. The solution was filtered and concentrated in vacuo to provide a residue that was purified by silica gel chromatography (1:2 EtOAc in hexane) to provide 5-bromo-2-(6-chloropyridin-3-yloxy)-N,N-diethyl-4-fluorobenzamide. MS m/z=403.0 [M+H].

1. custombefore being quenched with saturated sodium bicarbonate (100 mL)
2. additionThe reaction mixture was diluted with water (50 mL)
3. extractionextracted with EtOAc (3×50 mL)
4. washThe combined organic extracts were washed with saturated aqueous ammonium chloride, water, 10% aqueous sodium carbonate, saturated aqueous sodium chloride
5. dry with materialdried over sodium sulfate
6. filtrationThe solution was filtered
7. concentrationconcentrated in vacuo
8. customto provide a residue that
9. customwas purified by silica gel chromatography (1:2 EtOAc in hexane)