Post-Ugi gold-catalyzed diastereoselective domino cyclization for the synthesis of diversely substituted spiroindolines
作者:Amit Kumar、Dipak D Vachhani、Sachin G Modha、Sunil K Sharma、Virinder S Parmar、Erik V Van der Eycken
DOI:10.3762/bjoc.9.246
日期:——
3-formylindole and various acids and isonitriles produces adducts which are subjected to a cationic gold-catalyzeddiastereoselectivedominocyclization to furnish diversely substituted spiroindolines. All the reactions run via an exo-dig attack in the hydroarylation step followed by an intramolecular diastereoselective trapping of the imminium ion. The whole sequence is atom economic and the application of a
Ugi 炔丙胺与 3-甲酰基吲哚和各种酸和异腈的 Ugi 四组分反应产生加合物,这些加合物经过阳离子金催化的非对映选择性多米诺环化以提供多种取代的螺二氢吲哚。所有反应都通过加氢芳基化步骤中的外切攻击进行,然后是亚胺离子的分子内非对映选择性捕获。整个序列是原子经济的,多组分反应的应用确保了多样性。