作者:Alexandre Pradal、Patrick Y. Toullec、Véronique Michelet
DOI:10.1021/ol202577c
日期:2011.11.18
A variety of nonactivated hindered aromatic rings are acyloxylated (22 examples, up to 83% yield) in the presence of PPh3AuCl as the catalyst and di(acetoxy)iodobenzene as the oxidant. The reaction proceeds at 110 degrees C in an acid media and allows the formation of both hindered acetoxy and acyloxy derivatives. This methodology nicely complements the Pd-catalyzed arene acyloxylation reaction, which is not operating on hindered substrates and allows the Au-catalyzed unprecedented acyloxylation reaction of arenes, implying various carboxylic acids.
A new synthesis of o-di-t-butylbenzene and t-butylmesitylene
作者:Richard A. Finnegan、David Knutson
DOI:10.1039/c19660000172
日期:——
Palladium-Catalyzed Esterification of Carboxylic Acids with Aryl Iodides
作者:Hiroyuki Kitano、Hideto Ito、Kenichiro Itami
DOI:10.1021/acs.orglett.8b00775
日期:2018.4.20
The first palladium-catalyzed esterification of carboxylicacids with aryl iodides is described. A palladium-based catalytic system consisting of IBnF (1,3-bis((pentafluorophenyl)methyl)imidazole-2-ylidene) ligand was found to significantly accelerate the aryl–O bond-forming esterification reaction. A series of aryl iodides and carboxylicacids undergoes a palladium-catalyzed coupling reaction to provide
Deacylation of Esters, Thioesters and Amides by a Naphthalene-Catalysed Lithiation
作者:Miguel Yus、Cherif Behloul、David Guijarro
DOI:10.1055/s-2005-918501
日期:——
The reaction of different esters, thioesters and amides derived from pivalic, benzoic and 4-tert-butylbenzoic acids with an excess of lithium and a catalytic amount of naphthalene (8 mol%) led, after methanolysis, to the corresponding alcohols, thiols and amines, respectively, through a reductive non-hydrolytic procedure. This methodology represents a reasonable alternative to other non-reductive protocols