反应详情

To the suspension of 3-(2,4-dimethyl-1H-pyrrol-3-yl)-propionic acid (10 g, 60.8 mmol) in 60 mL of dichloromethane was added 1,1′-carbonyldiimidazole (11.6 g, 71.8 mmol) followed by the addition of 2 M dimethylamine solution in tetrahydrofuran (30 mL) and N,N-diisopropylethylamine (Hunig's base, 10 mL, 60.8 mmol). The dark red reaction mixture was stirred at room temperature overnight and poured into ice water. The organic layer was washed with brine until pH of 6, dried over anhydrous sodium sulfate, and concentrated. The crude product was purified on a silica gel column eluting with dichloromethane-methanol (98:2) to give 9.8 g (83%) of 3-(2,4-dimethyl-1H-pyrrol-3-yl)-N,N-dimethyl-propionamide as a yellow oil.

1. customThe dark red reaction mixture
2. washThe organic layer was washed with brine until pH of 6
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated
5. customThe crude product was purified on a silica gel column
6. washeluting with dichloromethane-methanol (98:2)