反应详情

A suspension of 6-aminonicotinic acid (2.0 g, 14.5 mmol) and sulfuric acid (2 mL) in methanol (125 mL) was heated at reflux overnight. The solution was cooled, the methanol evaporated and the residue was taken up in water (100 mL) and made basic with NaHCO3 (s), causing a white solid to precipitate. The mixture was extracted with chloroform (3×40 mL) and the combined extracts were dried (MgSO4) and evaporated to afford the ester as an off-white solid (1.04 g, 30%).

1. temperaturewas heated
2. temperatureat reflux overnight
3. temperatureThe solution was cooled
4. customthe methanol evaporated
5. customto precipitate
6. extractionThe mixture was extracted with chloroform (3×40 mL)
7. dry with materialthe combined extracts were dried (MgSO4)
8. customevaporated