反应详情

(1S)-1-Cyclopropylethanamine (0.50 mL, 5.4 mmol, Alfa Aesar: Cat. #H27499) was added to a mixture of 5-bromopyridine-2-carboxylic acid (1.0 g, 5.0 mmol, Alfa Aesar: Cat. #B25675) in methylene chloride (30.0 mL), followed by benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (2.4 g, 5.4 mmol) and N,N-diisopropylethylamine (1.7 mL, 9.9 mmol). The reaction mixture was stirred at room temperature overnight. The reaction mixture was worked up with aqueous Na2CO3, 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 (0-15%) to afford the desired product. LCMS (M+H)+: m/z=269.0/271.0.

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 (0-15%)