反应详情

N,N-Diisopropylethylamine (1.3 mL, 7.5 mmol) was added to a mixture of 5-chloropyrazine-2-carboxylic acid (0.40 g, 2.5 mmol), N,N,N′,N′-tetramethyl-O-(7-azabenzotriazol-1-yl)uronium hexafluorophosphate (1.0 g, 2.8 mmol) and 1-(trifluoromethyl)cyclopropanamine (0.32 g, 2.5 mmol) (Oakwood, Cat. #: 038175) in dichloromethylene (10 mL). The reaction mixture was stirred at room temperature overnight. The reaction mixture was worked up with saturated aqueous NaHCO3, and extracted with ethyl acetate (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 (0.41 g, 67%). LCMS (M+H)+: m/z=266.0/267.9.

1. extractionextracted with ethyl acetate (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%)