Tandem reactions of copper-catalyzed cross-coupling of N-substituted prop-2-yn-1-amines with diazoacetates and subsequent cyclization have been developed to prepare several types of four- to six-membered heterocycles. Copper-catalyzed allenoate formation has been proven as the key step for the diverse annulations. Importantly, on the basis of the choice of different N-protecting groups of the alkyne substrates
已开发出
铜催化的N-取代的Pro-2-yn-1-胺与
重氮乙酸酯的交叉偶联以及随后的环化反应,以制备几种类型的四元至六元杂环。
铜催化的
脲基酸盐的形成已被证明是实现多种环空工艺的关键步骤。重要的是,在选择
炔烃底物的不同N-保护基的基础上,已经很好地建立了针对5,6-二氢
哌啶-2-酮,2-亚甲基氮杂
环丁烷和
呋喃衍
生物的方法。