Palladium-Catalyzed Oxidative Olefination of Phenols Bearing Removable Directing Groups under Molecular Oxygen
作者:Bin Liu、Huai-Zhi Jiang、Bing-Feng Shi
DOI:10.1021/jo4027403
日期:2014.2.7
An efficient Pd(II)-catalyzed oxidative olefination of phenols bearing removable directing groups with molecular oxygen as the sole oxidant has been developed. This reaction protocol provides an efficient and robust synthetic tool for the synthesis of o-alkenyl phenols under mild conditions.
PROCESS FOR THE CATALYTIC SYNTHESIS OF DIARYL ETHERS
申请人:Cotte Alain
公开号:US20090143594A1
公开(公告)日:2009-06-04
Described is a process for preparing diaryl ethers of the formula (I)
Ar—O—Ar′ (I)
In which Ar is an aryl or substituted aryl group and Ar′ is an aryl, substituted aryl, heteroaryl or substituted heteroaryl group,
by reacting an aryl of formula (II) or a aryloxy salt of formula (III)
Ar—OH (II)
Ar—OR (III)
In which Ar has the same meaning as in formula (I) and R is an alkali metal,
with an aryl or heteroaryl bromide of formula (IV)
Ar′—Br (IV)
In which Ar′ has the same meaning as in formula (I),
characterized in that the reaction is carried out in the presence of a copper(I)salt and a 1-substituted imidazole as catalyst system.
Mild Addition of Nucleophiles to Pyridine-<i>N</i>-Oxides
作者:Allyn T. Londregan、Sandra Jennings、Liuqing Wei
DOI:10.1021/ol200352g
日期:2011.4.1
A general and facile one-pot procedure for the synthesis of 2-substituted pyridines from the corresponding pyridine-N-oxides and nucleophiles is presented as a mild alternative to SNAr chemistry. A variety of nucleophiles and heterocyclic-N-oxides participate effectively in this transformation, which uses the phosphonium salt, PyBroP, as a means of substrate activation.
Process for the catalytic synthesis of diaryl ethers
申请人:Saltigo GmbH
公开号:US08304550B2
公开(公告)日:2012-11-06
Described is a process for preparing diaryl ethers of the formula (I)
Ar—O—Ar′ (I)
In which Ar is an aryl or substituted aryl group and Ar′ is an aryl, substituted aryl, heteroaryl or substituted heteroaryl group,
by reacting an aryl of formula (II) or a aryloxy salt of formula (III)
Ar—OH (II)
Ar—OR (III)
In which Ar has the same meaning as in formula (I) and R is an alkali metal,
with an aryl or heteroaryl bromide of formula (IV)
Ar′—Br (IV)
In which Ar′ has the same meaning as in formula (I),
characterized in that the reaction is carried out in the presence of a copper(I)salt and a 1-substituted imidazole as catalyst system.
Umpolung Synthesis of Pyridyl Ethers by Bi
<sup>V</sup>
‐Mediated O‐Arylation of Pyridones
作者:Katie Ruffell、Liliana C. Gallegos、Kenneth B. Ling、Robert S. Paton、Liam T. Ball
DOI:10.1002/anie.202212873
日期:2022.12.19
We demonstrate that sterically- and electronically-diverse pyridyl ethers can be accessed via BiV-mediated C−O coupling of 2- or 4-pyridones with arylboronic acids. Use of a bismacyclic reagent not only confers modularity on our methodology, but also results in highly regioselective O-arylation that is unprecedented for BiV.
我们证明可以通过 Bi V介导的 2- 或 4- 吡啶酮与芳基硼酸的 C−O 偶联获得空间和电子多样性的吡啶基醚。双环试剂的使用不仅赋予我们的方法模块化,而且还导致高度区域选择性的 O-芳基化,这对于 Bi V来说是前所未有的。