Orthogonal Regulation of Nucleophilic and Electrophilic Sites in Pd‐Catalyzed Regiodivergent Couplings between Indazoles and Isoprene
作者:Wen‐Shuang Jiang、Ding‐Wei Ji、Wei‐Song Zhang、Gong Zhang、Xiang‐Ting Min、Yan‐Cheng Hu、Xu‐Liang Jiang、Qing‐An Chen
DOI:10.1002/anie.202100137
日期:2021.4.6
multiple active sites. Herein, an orthogonal regulation of nucleophilic and electrophilic sites in the regiodivergent hydroamination of isoprene with indazoles is demonstrated. Under Pd‐hydride catalysis, the 1,2‐ or 4,3‐insertion pathway with respect to the electrophilic sites on isoprene could be controlled by the choice of ligands. In terms of the nucleophilic sites on indazoles, the reaction occurs
取决于反应物的性质和反应机理,在涉及多个活性位点的反应中,一种主要的区域异构体可能是有利的。在本文中,证明了异戊二烯与吲唑的区域发散性氢化胺化中亲核和亲电子位点的正交调节。在钯氢化物催化下,异戊二烯上亲电部位的1,2或4,3插入途径可通过选择配体来控制。就吲唑上的亲核位点而言,反应发生在N 1-或N 2处吲唑的位置由酸助催化剂控制。为了使机理和区域选择性合理化,已经进行了初步的实验研究。这项研究不仅为异戊二烯的选择性功能化提供了实用工具,而且为操纵吲唑的N功能化的区域选择性提供了指导。