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Ascorbic Acid as an Aryl Radical Inducer in the Gold‐Mediated Arylation of Indoles with Aryldiazonium Chlorides
Author(s) -
MedinaMercado Ignacio,
AsomozaSolís Eric Omar,
MartínezGonzález Eduardo,
UgaldeSaldívar Victor Manuel,
LedesmaOlvera Lydia Gabriela,
BarqueraLozada José Enrique,
GómezVidales Virginia,
BarrosoFlores Joaquín,
FrontanaUribe Bernardo A.,
Porcel Susana
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904413
Subject(s) - ascorbic acid , chemistry , aryl , context (archaeology) , cyclic voltammetry , combinatorial chemistry , antioxidant , chloride , oxidative phosphorylation , organic chemistry , electrochemistry , biochemistry , paleontology , alkyl , food science , electrode , biology
In recent years interest in the development of protocols that facilitate the oxidative addition of gold to access mild cross‐coupling processes mediated by this metal has increased. In this context, we report herein that ascorbic acid, a natural and readily accessible antioxidant, can be used to accelerate the oxidative addition of aryldiazonium chlorides onto Au I . The aryl–Au III species generated in this way, has been used to prepare 3‐arylindoles in a one‐pot protocol starting from anilines and para ‐, meta ‐, and ortho ‐ substituted aryldiazonium chlorides. The mechanism underlying the oxidative addition has been examined in detail based on EPR analyses, cyclic voltammetry, and DFT calculations. Interestingly, we have found that in this protocol, the chloride atom induces the Au II /Au III oxidation step.