反应详情

To a chloroform solution (5 mL) in which ethyl 3-ethoxy-2-(3-bromo-2,4,5-trifluorobenzoyl)acrylate prepared from ethyl 3-bromo-2,4,5-trifluorobenzoylacetate (1.32 g) in a manner known per se in the art was dissolved, 2-amino-6-(t-butylamino) -3,5-difluoropyridine was added under TLC monitoring of the reaction until conversion into an amino acrylate derivative was completed. The reaction mixture was concentrated under reduced pressure to obtain a yellow solid residue. To the residue, anhydrous potassium carbonate (1.2 g) and N,N-dimethylformamide (2 mL) were added, and the mixture was stirred at 90° for 15 minutes. The mixture was allowed to cool down. Chloroform (30 mL) and distilled water (300 mL) were added, and the mixture was allowed to separate into layers. The chloroform layer was washed twice with distilled water (300 mL), dried over anhydrous magnesium sulfate, concentrated under reduced pressure, and then left over. The precipitate was collected by filtration, and washed successively with ethanol and diisopropyl ether in this order to obtain the title compound (1.41 g) as a colorless powder.

1. dissolutionwas dissolved
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. customto obtain a yellow solid residue
4. temperatureto cool down
5. distillationChloroform (30 mL) and distilled water (300 mL)
6. additionwere added
7. customto separate into layers
8. washThe chloroform layer was washed twice with distilled water (300 mL)
9. dry with materialdried over anhydrous magnesium sulfate
10. concentrationconcentrated under reduced pressure
11. waitleft over
12. filtrationThe precipitate was collected by filtration
13. washwashed successively with ethanol and diisopropyl ether in this order