Cycloamidination of Aminoalkenes with Nitriles: Synthesis of Substituted 2‐Imidazolines and Tetrahydropyrimidines
作者:Shujian Huang、Yinlin Shao、Lixin Zhang、Xigeng Zhou
DOI:10.1002/anie.201508442
日期:2015.11.23
with nitriles has been achieved by using rare‐earth complexes. This reaction is equivalent to the desired intramolecular hydroamination of alkenylamidines, and allows a new direct access to substituted 2‐imidazolines and tetrahydropyrimidines in high yields under operationally simple reaction conditions. Moreover, the methodology is also efficient for synthesis of symmetric and unsymmetric bridged diimidazolines
通过使用稀土配合物,首次实现了氨基腈与氨基烯烃的催化环酰胺化反应。该反应等同于所需的烯基mol的分子内氢化胺化反应,并允许在操作简单的反应条件下以高收率直接获得取代的2-咪唑啉和四氢嘧啶的新途径。此外,该方法对于合成对称和不对称桥联二咪唑啉也是有效的。与传统的逐步介导的合成方法相比,本方法避免了使用添加剂和苛刻的反应条件,从而导致了完全不同的产品分布。机理数据表明,该反应涉及镧系元素络合物最初的NH活化,然后腈插入Ln中。N键形成form化镧系元素中间体,该中间体经历环化作用。