制备了两种[[NHC] Au I –Ar]的同源络合物,其中的芳基取代基为苯基或五氟苯基。用PhICl 2处理[(IPr)Au I C 6 F 5 ]会直接产生预期的Au III氧化加成产物[(IPr)Au III(Cl)2 C 6 F 5 ]。该配合物是热稳定的,但经过光化学还原消除后可生成[(IPr)Au I Cl]和C 6 F 5 Cl。相反,[(IPr)Au I Ph]与PhICl 2的反应不会提供可分离的Au III氧化加成产物,而是直接导致[[(IPr)Au I Cl]和PhCl的形成,大概是通过[(IPr)Au III(Cl)2 Ph]中间体。这些相关的反应途径是根据两种[(NHC)Au I –Ar]配合物的电子结构合理化的。
C−C Coupling Reactivity of an Alkylgold(III) Fluoride Complex with Arylboronic Acids
作者:Neal P. Mankad、F. Dean Toste
DOI:10.1021/ja106257n
日期:2010.9.22
alkylgold(III) fluorides have been proposed as catalytic intermediates that undergo C-C coupling with reagents such as arylboronic acids in Au(I)/Au(III) cross-coupling reactions. Here is reported the first experimental evidence for this elementary mechanistic step. Complexes of the type (NHC)AuMe (NHC = N-heterocyclic carbene) were oxidized with XeF(2) to yield cis-(NHC)AuMeF(2) products, which were found to be
The Role of Gold Acetylides as a Selectivity Trigger and the Importance of <i>gem</i>-Diaurated Species in the Gold-Catalyzed Hydroarylating-Aromatization of Arene-Diynes
作者:A. Stephen K. Hashmi、Ingo Braun、Matthias Rudolph、Frank Rominger
DOI:10.1021/om200946m
日期:2012.1.23
investigations were undertaken, giving new insights into the so-far underestimated role of acetylides in gold chemistry. The gold plays a fascinating dual role serving to both catalyze the reaction and activate the substrate by Au–C-σ bond formation. Evidence of gem-diaurated compounds playing an important part for gold catalysis is also reported.
Application of Fundamental Organometallic Chemistry to the Development of a Gold-Catalyzed Synthesis of Sulfinate Derivatives
作者:Miles W. Johnson、Scott W. Bagley、Neal P. Mankad、Robert G. Bergman、Vincent Mascitti、F. Dean Toste
DOI:10.1002/anie.201400037
日期:2014.4.22
The development of a gold(I)‐catalyzed sulfination of aryl boronic acids is described. This transformation proceeds through an unprecedented mechanism which exploits the reactivity of gold(I)–heteroatom bonds to form sulfinate anions. Further in situ elaboration of the sulfinate intermediates leads to the corresponding sulfones and sulfonamides, two pharmacophores routinely encountered in drug discovery
The Role of Metal Hydroxide Complexes in Late Transition Metal‐Mediated Transmetalation Reaction: The Case of Gold
作者:Stéphanie Dupuy、L. Ellis Crawford、Michael Bühl、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1002/adsc.201200233
日期:2012.9.17
In gold chemistry, the hydroxide function on the metal center was observed to act as a potent transmetalation group facilitator when reacted with boronic acids leading to the exceedingly rapid formation of gold‐aryl bonds.
Simple Synthetic Routes to N‐Heterocyclic Carbene Gold(I)–Aryl Complexes: Expanded Scope and Reactivity
作者:Nikolaos V. Tzouras、Marina Saab、Wim Janssens、Thibault Cauwenbergh、Kristof Van Hecke、Fady Nahra、Steven P. Nolan
DOI:10.1002/chem.202000876
日期:2020.4.24
gold-aryl compounds bearing N-heterocyclic carbene (NHC) ligands sparked an investigation of their reactivity and potential utility as organometallic synthons. The use of a mild base and green solvents provide access to these compounds, starting from widely available boronic acids and various [Au(NHC)Cl] complexes, with reactions taking place under air, at roomtemperature and leading to high yields with unprecedented