反应详情

2-Propanamine (1.2 mL, 14 mmol) was added to a mixture of 4-bromo-3-fluorobenzoic acid (2.09 g, 9.54 mmol, Alfa Aesar: Cat. #B25475) in methylene chloride (52.2 mL, 815 mmol), followed by benzotriazol-1-yloxytris(dimethylamino)-phosphonium hexafluorophosphate (4.6 g, 10. mmol) and N,N-diisopropylethylamine (3.3 mL, 19 mmol). The reaction mixture was stirred at room temperature overnight. The reaction mixture was worked up with aqueous NaHCO3, and extracted with dichloromethylene (3×20 mL). The combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated under reduced pressure. The residue was purified by flash chromatography on a silica gel column with ethyl acetate in hexanes (0-20%) to afford the desired product (2.28 g, 91.8%). LCMS (M+H)+: m/z=260.0/262.0.

1. extractionextracted with dichloromethylene (3×20 mL)
2. washThe combined organic layers were washed with brine
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by flash chromatography on a silica gel column with ethyl acetate in hexanes (0-20%)