反应详情

To a mixture of 5-amino-2,3-dihydrofuro[3,2-c]pyridin-5-ium 2,4-dinitrobenzenolate (8.00 g, 25.0 mmol) and potassium carbonate (4.84 g, 35.0 mmol) in dimethylformamide (100 mL) was added ethyl propiolate (2.80 mL, 27.6 mmol) under ice-cooling, and the mixture was stirred at room temperature for 20 hr. The reaction solution was diluted with water and extracted with ethyl acetate. The extract was dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography (ethyl acetate/hexane=10/90→40/60) to give the title compound (980 mg, yield 17%).

1. temperaturecooling
2. extractionextracted with ethyl acetate
3. dry with materialThe extract was dried over anhydrous sodium sulfate
4. customThe solvent was evaporated under reduced pressure
5. customthe residue was purified by silica gel column chromatography (ethyl acetate/hexane=10/90→40/60)