反应详情

To a mixture of 5-amino-2,3-dihydrofuro[3,2-c]pyridin-5-ium 2,4-dinitrobenzenolate (1.00 g, 3.12 mmol) and potassium carbonate (640 mg, 4.37 mmol) in dimethylformamide (20 mL) was added methyl 3-phenylpropiolate (506 μL, 3.43 mmol) under ice-cooling, and the mixture was stirred at room temperature for 14 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=30/70→40/60) to give the title compound (166 mg, yield 18%).

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=30/70→40/60)