反应详情

温度

130 °C

Ethyl cyanoformate(21.4 g, 0.216 mol) and 3-methylfuran-2-carbaldehyde-N-phenylimine(10.0 g, 54.1 mmol) were mixed at room temperature in xylene (50 mL) then heated to reflux at 120 to 140° C. with stirring. A xylene (30 mL) solution of 11.7 g (0.108 mol) of ethyl chloroformate was added dropwise for an hour to the resulting mixture. After all the solution had been added, the reaction mixture was heated to reflux for 2 hours, it was allowed to cool to room temperature, and the solvent was distilled off to give 14.0 g of crude product. This product was purified by column chromatography on silica gel, giving 5.40 g (52.3% yield) of 5-ethoxycarbonylfuro[2,3-c]pyridine.

1. temperaturethen heated
2. additionAfter all the solution had been added
3. temperaturethe reaction mixture was heated
4. temperatureto reflux for 2 hours
5. temperatureto cool to room temperature
6. distillationthe solvent was distilled off
7. customto give 14.0 g of crude product
8. customThis product was purified by column chromatography on silica gel