在 Lewis 碱催化剂存在下,Danishefsky 的二烯之间的 Lewis 碱催化的 Aza-Diels-Alder 型反应。一种合成取代的2,3-二氢吡啶-4-酮的有效方法
摘要:
描述了各种亚胺与 1-methoxy-3-trimethylsilyloxy-1,3-butadiene (Danishefsky's diene) 衍生物的 Aza-Diels-Alder 型反应,这些反应由 Lewis 碱如甲醇锂催化。该反应通过逐步途径进行,即首先通过亚氨基-羟醛反应,然后是酸介导的环化,以高产率提供相应的2,3-二氢吡啶-4-酮。An appropriate choice of the substituents on nitrogen plays important roles both in addition of the silyl enolates and in the subsequent annulation to form the desired cycloadducts.
Lewis Base Catalyzed Aza-Diels-Alder Type Reactions between Danishefsky’s Dienes in the Presence of Lewis Base Catalysts. An Efficient Method for the Synthesis of Substituted 2,3-Dihydropyridin-4-ones
Aza-Diels-Alder type reactions of various imines with 1-methoxy-3-trimethylsilyloxy-1,3-butadiene (Danishefsky's diene) derivatives catalyzed by Lewis bases such as lithium methoxide are described. The reaction proceeds via a stepwise pathway, i.e. first by an imino-aldol reaction followed by the acid mediated annulation to afford the corresponding 2,3-dihydropyridin-4-ones in high yields. An appropriate
描述了各种亚胺与 1-methoxy-3-trimethylsilyloxy-1,3-butadiene (Danishefsky's diene) 衍生物的 Aza-Diels-Alder 型反应,这些反应由 Lewis 碱如甲醇锂催化。该反应通过逐步途径进行,即首先通过亚氨基-羟醛反应,然后是酸介导的环化,以高产率提供相应的2,3-二氢吡啶-4-酮。An appropriate choice of the substituents on nitrogen plays important roles both in addition of the silyl enolates and in the subsequent annulation to form the desired cycloadducts.