A 2-nitrated 3-oxoester reacted with amines or alcohols to afford unsymmetrical malonic acid derivatives as a result of nucleophilic substitution accompanying C–C bond cleavage. The 2-nitrated 3-oxoester easily formed ammonium salts with amines. When the amine is liberated from the salt under equilibrium, nucleophilic amine and electrophilic keto ester locate close to each other. This intimate pair effect causes a pseudo intramolecular reaction to occur, giving rise to effective substitution under mild conditions.
一种 2-硝化 3-氧代酯与胺或醇发生反应,生成不对称
丙二酸衍
生物,这是伴随着 C-C 键裂解的亲核取代反应的结果。2-硝化 3-氧代酯很容易与胺形成
铵盐。当胺在平衡状态下从盐中释放出来时,亲核胺和亲电
酮酯相互靠近。这种亲密的配对效应会导致发生伪分子内反应,从而在温和的条件下产生有效的取代反应。