Hydrophenoxylation of Alkynes by Cooperative Gold Catalysis
作者:Yoshihiro Oonishi、Adrián Gómez-Suárez、Anthony R. Martin、Steven P. Nolan
DOI:10.1002/anie.201304182
日期:2013.9.9
Double impact: The title method gives aryl vinylethers in high yields, short reaction times, Z‐stereospecificity, and good regioselectivities. Insights into the reaction mechanism highlight the role of [Au(NHC)}2(μ‐OH)][BF4] (NHC=N‐heterocyclic carbene) as both a Lewis acid, [Au(NHC)][BF4], and a Brønsted base, [Au(NHC)(OH)], thereby generating a synergistic effect between the two gold moieties.
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.
Mechanistic Insights into Rhenium‐Catalyzed Regioselective C‐Alkenylation of Phenols with Internal Alkynes
作者:Masahito Murai、Masaki Yamamoto、Kazuhiko Takai
DOI:10.1002/chem.201903910
日期:2019.11.27
rhenium, a metal between the early and late transitionmetals in the periodic table, was key for the activation of both the soft carbon-carbon triple bond of the alkyne and the hard oxygen atom of the phenol, at the same time. ortho-Selective alkenylation with allenes also provided the corresponding adducts with a substitution pattern different from that obtained by the addition reaction with alkynes.