Cyclization of Gold Acetylides: Synthesis of Vinyl Sulfonates via Gold Vinylidene Complexes
作者:Janina Bucher、Thomas Wurm、Kumara Swamy Nalivela、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201310280
日期:2014.4.7
Differently substituted terminal alkynes that bear sulfonate leaving groups at an appropriate distance were converted in the presence of a propynyl gold(I) precatalyst. After initial formation of a gold acetylide, a cyclization takes place at the β‐carbon atom of this species. Mechanistic studies support a mechanism that is related to that of dual gold‐catalyzed reactions, but for the new substrates
A silver-free system for the direct C–H auration of arenes and heteroarenes from gold chloride complexes
作者:Nanna Ahlsten、Gregory J. P. Perry、Xacobe C. Cambeiro、Tanya C. Boorman、Igor Larrosa
DOI:10.1039/c3cy00240c
日期:——
A new methodology for the direct CâH auration of electron-deficient arenes and heteroarenes with simple bases and readily available [Au(PR3)Cl] complexes is described. This system allows the preparation of a wide scope of arylâAu(I) compounds without the need for using Ag(I) additives or preparing and isolating basic Au(I) hydroxide complexes.
Hydrophenoxylation of internal alkynes catalysed with a heterobimetallic Cu-NHC/Au-NHC system
作者:Faïma Lazreg、Stefano Guidone、Alberto Gómez-Herrera、Fady Nahra、Catherine S. J. Cazin
DOI:10.1039/c6dt04513h
日期:——
A dual catalytic process based on a heterobimetallic system, consisting of Cu-NHC and Au-NHC complexes, was shown to be highly active and selective for the hydrophenoxylation of internal alkynes.
Rearrangement of a Transient Gold Vinylidene into Gold Carbenes
作者:Wouter Debrouwer、Alois Fürstner
DOI:10.1002/chem.201700326
日期:2017.3.28
metastable species evolved into the cationic gold carbene complex 22 bearing a phenanthrene unit and a hydroxyl group at the aurated center; the recorded data suggest that this product might be better viewed as an acylgold species protonated by triflic acid. The use of [Me3O⋅BF4] as the activating agent led to formation of the analogous Fischer‐type carbene 24, whereas replacement of gold by the [CpRu(PPh3)2]+
Dinuclear Gold(I) Complexes Bearing Alkyl-Bridged Bis(N-heterocyclic carbene) Ligands as Catalysts for Carboxylative Cyclization of Propargylamine: Synthesis, Structure, and Kinetic and Mechanistic Comparison to the Mononuclear Complex [Au(IPr)Cl]
作者:Tahani A. C. A. Bayrakdar、Fady Nahra、Jack V. Davis、Mohan M. Gamage、Burjor Captain、Manuel Temprado、Marco Marazzi、Marina Saab、Kristof Van Hecke、Dominic Ormerod、Carl D. Hoff、Steven P. Nolan
DOI:10.1021/acs.organomet.0c00404
日期:2020.8.10
with an arene bearing an isopropyl substituent for X = Cl, Br. This prompted more detailed kinetic and mechanistic studies by FTIR comparing dinuclear complex 2 of X = Cl to complex 9. Fortuitously the FTIR studies allowed monitoring of the formation of the products carbamic acid (CA) and carbamate salt (CS), as well as a key cyclized intermediate first discovered by Ikariya. These data allow additional