Controllable Si−C Bond Activation Enables Stereocontrol in the Palladium‐Catalyzed [4+2] Annulation of Cyclopropenes with Benzosilacyclobutanes
作者:Xing‐Ben Wang、Zhan‐Jiang Zheng、Jia‐Le Xie、Xing‐Wei Gu、Qiu‐Chao Mu、Guan‐Wu Yin、Fei Ye、Zheng Xu、Li‐Wen Xu
DOI:10.1002/anie.201913060
日期:2020.1.7
ligand furnished a variety of chiral bicyclic silaheterocycle derivatives with good enantioselectivity (up to 95.5:4.5 er). Owing to the mild reaction conditions, the good stereoselectivity profile, and the ready availability of the functionalized precursors, this process constitutes a useful and straightforward strategy for the synthesis of densely functionalized silacycles.
报道了一种新颖而又不寻常的钯催化的[4 + 2]环丙烯与苯并硅烷基环丁烷的环化反应。该反应通过与环丙烯环扩展/插入形成新的C(sp2)-C(sp3)和Si-C(sp3)键协同作用的化学选择性Si-C(sp2)键活化而发生。在温和条件下,以高收率和优异的非对映选择性形成了一系列先前难以捉摸的高应变双环骨架,硅双环[4.1.0]庚烷。与手性亚磷酰胺配体的反应的不对称形式提供了具有良好对映选择性(高达95.5:4.5 er)的各种手性双环硅杂环化合物。由于反应条件温和,良好的立体选择性和官能化前体的可用性,