反应详情

Ethyl 2-(2-ethoxycarbonyl-3-pyridyloxy)acetate (13.6 g, 54.0 mmol) and sodium ethoxide (8.08 g, 118.8 mmol) in toluene (200 mL) were heated under reflux for 18 h. After cooling, a precipitate was collected by filtration, dissolved in the minimum amount of hot water (about 300 mL), and acidified with acetic acid (6 mL). The resulting precipitate was filtered, and dried in vacuo to give ethyl 3-hydroxyfuro[3,2-b]pyridine-2-carboxylate as a solid (7.0 g).

1. temperatureunder reflux for 18 h
2. temperatureAfter cooling
3. filtrationa precipitate was collected by filtration
4. dissolutiondissolved in the minimum amount of hot water (about 300 mL)
5. filtrationThe resulting precipitate was filtered
6. customdried in vacuo