Remarkably Effective Phosphanes Simply with a PPh<sub>2</sub>Moiety: Application to Pd-Catalysed Cross-Coupling Reactions for Tetra-<i>ortho</i>-substituted Biaryl Syntheses
作者:Chau Ming So、Wing Kin Chow、Pui Ying Choy、Chak Po Lau、Fuk Yee Kwong
DOI:10.1002/chem.201000723
日期:2010.7.19
Expanding the horizons of ArPPh2: New applications of triarylphosphane ligands are presented. The Pd–L1 and Pd–L2 complexes offer exceptionally high activity in Suzuki–Miyaura cross‐couplings of aryl chlorides. The extremely congested synthesis of tetra‐ortho‐substituted biaryl compounds is achieved for the first time by simply using triarylphosphane ligands.
We report a new air‐stable PdI dimer, [Pd(μ‐I)(PCy2tBu)]2, which triggers E‐selective olefin migration to enamides and styrene derivatives in the presence of multiple functional groups and with complete tolerance of air. The same dimer also triggers extremely rapidC−Ccoupling (alkylation and arylation) at roomtemperature in a modular and triply selective fashion of aromatic C−Br, C−OTf/OFs, and
我们报告了一种新的空气稳定的Pd I二聚体[Pd(μI)(PCy 2 t Bu)] 2,它在存在多个官能团且具有完全耐受性的情况下触发E-选择性烯烃向酰胺和苯乙烯衍生物的迁移空气 同一二聚体还可以在室温下以模块化和三重选择性的方式在聚(假)卤代芳烃中以芳族C-Br,C-OTf / OF和C-Cl键的形式快速触发C-C偶联(烷基化和芳基化)在具有邻位C-OTf的取代基的底物上显示出比以前的Pd I二聚体更好的活性。
Modular Functionalization of Arenes in a Triply Selective Sequence: Rapid C(sp<sup>2</sup>
) and C(sp<sup>3</sup>
) Coupling of C−Br, C−OTf, and C−Cl Bonds Enabled by a Single Palladium(I) Dimer
作者:Sinead T. Keaveney、Gourab Kundu、Franziska Schoenebeck
DOI:10.1002/anie.201808386
日期:2018.9.17
competing coupling sites would enable straightforward access to densely functionalized compound libraries. Historically, the site selection in Pd0‐catalyzed functionalizations of poly(pseudo)halogenated arenes has been unpredictable, being dependent on the employed catalyst, the reaction conditions, and the substrate itself. Building on our previous report of C−Br‐selectivefunctionalization in the presence
method for the Suzuki‐type cross‐coupling of phenols with aryl boronic acids using dichloroimidazolidinedione (DCID) as a new reagent is presented. In the presence of DCID and Pd/metal–organic framework (MOF), coupling of aryl boronic acids with a wide range of phenols, was carried out smoothly in tetrahydrofuran (THF) at reflux conditions to afford the cross‐coupling products in good to excellent yields