An efficient Au(I)‐catalyzedintramolecular sequential cycloisomerization of linear 1,3,9‐ene‐allene‐ynes to prepare architecturally challenging spiro tetrahydro‐3H‐dicyclopenta[a,b]naphthalene derivatives is reported. The proposed mechanism involves an initial gold‐catalyzed1,3‐ene‐allene cycloisomerization, followed by a formal [4+2] cycloaddition to give the fused spirocarbocyclic products containing
作者:Chetan C. Chintawar、Amit K. Yadav、Nitin T. Patil
DOI:10.1002/anie.202002141
日期:2020.7.13
Herein, we disclose the gold‐catalyzed 1,2‐diarylation of alkenes through the interplay of ligand‐enabled AuI/AuIII catalysis with the idiosyncratic π‐activation mode of gold complexes. Unlike the classical migratory‐insertion‐based approach to 1,2‐diarylation, the present approach not only circumvents the formation of direct Ar−Ar′ coupling and Heck‐type side products but more intriguingly demonstrates
本文中,我们通过配体使能的Au I / Au III催化与金配合物的特质π活化模式的相互作用揭示了金的烯烃1,2-二芳基化反应。与经典的基于迁移插入的方法进行1,2-二芳基化不同,本方法不仅规避了直接Ar-Ar'偶联和Heck型副产物的形成,而且更有趣地证明了其反应性和选择性与先前已知的互补金属催化(Pd,Ni或Cu)。对机理进行详细研究的结果表明,由于芳基烯烃具有非清白的性质,芳基碘化物向Au I络合物的氧化加成是限速步骤。
Palladium-Catalyzed Intermolecular Trans-Selective Carbofunctionalization of Internal Alkynes to Highly Functionalized Alkenes
carbofunctionalization of internal alkynes has been established herein. This method proceeds through a formal anti-carbopalladation, forming trans-alkenyl palladium species, which was trapped by aryl boronic acids to provide all-carbon tetrasubstituted alkenes in 32–92% yields. The trans-selective arylsilylation/remote C–H silylation and hydroarylation/remote C–H borylation of internal alkynes were also achieved using