Copper‐Catalyzed Cascade Cyclization of Indolyl Homopropargyl Amides: Stereospecific Construction of Bridged Aza‐[
<i>n</i>
.2.1] Skeletons
作者:Tong‐De Tan、Xin‐Qi Zhu、Hao‐Zhen Bu、Guocheng Deng、Yang‐Bo Chen、Rai‐Shung Liu、Long‐Wu Ye
DOI:10.1002/anie.201904698
日期:2019.7.8
array of valuable complex heterocycles. However, these tandem reactions have been mostly limited to noble‐metal catalysis, and are initiated by an exo‐cyclization pathway. Reported herein is an unprecedented copper‐catalyzed endo‐cyclization‐initiated tandem reaction of indolyl homopropargyl amides, where copper catalyzes both the hydroamination and Friedel–Crafts alkylation process. This method allows
末端炔烃的催化环异构化引发的级联环化引起了人们的极大兴趣,并已广泛用于各种有价值的复杂杂环的简便合成中。然而,这些串联反应已经主要限于贵金属催化,并且由被启动外-cyclization通路。本文报道的是一种前所未有的铜-催化内切-cyclization发起的吲哚基高炔丙基酰胺,其中铜催化两个氢胺化和的Friedel-Crafts烷基化过程的串联反应。这种方法可以实现实用的,原子经济的有价值的桥连氮杂[ n .2.1]骨架(n= 3-6),具有广泛的底物范围,并且通过手性转移策略具有出色的非对映选择性和对映选择性。此外,这种新颖的级联环化的机理原理也得到了控制实验的有力支持,并且与相关的金催化作用明显不同。