Rhodium-catalyzed enantioselective in situ C(sp3)−H heteroarylation by a desymmetrization approach
作者:Yujia Shi、Yan Qiao、Pengfei Xie、Miaomiao Tian、Xingwei Li、Junbiao Chang、Bingxian Liu
DOI:10.1016/j.cclet.2024.109544
日期:2024.1
reasonably achieved through the collaborative control of a large silicon substituted chiral ligand and C−H···, LP··· interactions between aryl rings of the carboxylate group and the substrate. Control experiments demonstrate that Rh-aryl bond formation nucleophilic cyclization is more critical for reaction efficiency than C−H activation of the nucleophilic cyclization byproduct.
通过利用芳基化试剂对氨基芳基炔进行亲核环化,实现了对映选择性甲基 C-H 芳基化的铑催化去对称反应。该反应在大气条件下产生含有全碳四元立构中心的手性吲哚,多种底物表现出良好的对映选择性(44 个实例)。机理和DFT研究表明,立体控制是通过大硅取代手性配体的协同控制以及羧酸酯基团芳环与底物之间的CH·,LP·相互作用来合理实现的。对照实验表明,Rh-芳基键形成亲核环化对于反应效率比亲核环化副产物的 C−H 活化更为关键。