Catalytic C(sp
<sup>3</sup>
)−H Arylation of Free Primary Amines with an
<i>exo</i>
Directing Group Generated In Situ
作者:Yan Xu、Michael C. Young、Chengpeng Wang、David M. Magness、Guangbin Dong
DOI:10.1002/anie.201604268
日期:2016.7.25
Herein, we report the palladium‐catalyzed direct arylation of unactivated aliphatic C−H bonds in free primary amines. This method takes advantage of an exo‐imine‐type directing group (DG) that can be generated and removed in situ. A range of unprotected aliphatic amines are suitable substrates, undergoing site‐selective arylation at the γ‐position. Methyl as well as cyclic and acyclic methylene groups
在这里,我们报告了游离伯胺中未活化的脂肪族CH键的钯催化直接芳基化。该方法利用了可在原位生成和去除的外亚胺型导向基团(DG)。一系列未保护的脂族胺是合适的底物,在γ位置进行位点选择性芳基化。甲基以及环状和无环亚甲基均可被活化。此外,当使用苯胺衍生的底物时,通过δ-CHH芳基化获得了初步的成功。还证明了以催化方式使用DG组分的可行性。