An efficient and facile synthesis of 2-amino-4-aryl-3,5-dicarbonitrile-6-ethoxypyridine via reaction of aromatic aldehydes, malononitrile, and ethanol in the presence of NaOH has been developed, without using the classic reagents amines and 1,3-dicarbonyl compounds. It is interesting that weak nucleophilic reagent ethanol could take part in the reaction without using strong base catalyst sodium ethylate. Compared with existing methods, the reported process has the advantages of excellent yields, easily obtainable raw materials, and mild reaction conditions.
通过芳香醛、
丙二腈和
乙醇在NaOH存在下的反应,已经开发出一种高效且简便的2-
氨基-4-芳基-3,5-二
氰基-6-乙氧基
吡啶合成方法,无需使用传统的胺和1,3-二羰基化合物试剂。有趣的是,弱亲核试剂
乙醇无需使用强碱催化剂
乙醇钠即可参与反应。与现有方法相比,该方法具有产量高、原料易得且反应条件温和等优点。