反应详情

A suspension of 6-(ethylamino)nicotinic acid (50 g, 0.3 mol) in methanol (500 ml) was treated with concentrated H2SO4 (30 ml). The reaction was heated at reflux for 18 hours. The reaction mixture was then evaporated, poured into ice water (1 L) and adjusted to pH8 with solid sodium hydrogen carbonate (foaming). The aqueous mixture was extracted with ethyl acetate (3×300 ml) and the organic layers combined, dried (MgSO4) and evaporated to give methyl 6-(ethylamino)nicotinoate as an off-white solid (45.5 g, 84%).

1. temperatureThe reaction was heated
2. temperatureat reflux for 18 hours
3. customThe reaction mixture was then evaporated
4. additionpoured into ice water (1 L)
5. extractionThe aqueous mixture was extracted with ethyl acetate (3×300 ml)
6. dry with materialdried (MgSO4)
7. customevaporated