作者:Robin B. Bedford、Jens U. Engelhart、Mairi F. Haddow、Charlotte J. Mitchell、Ruth L. Webster
DOI:10.1039/c0dt00385a
日期:——
The solvent-free, palladium-catalysed reaction of anilides with CuCl2 in the presence or absence of copper acetate yields ortho-chlorinated anilides in good to excellent yields, even on a large scale (100 mmol). By contrast, the equivalent reactions with copper bromide, either solvent free or in 1,2-dichloroethane, in the presence or absence of palladium, under air or inert conditions, gave the products
Mild CH Halogenation of Anilides and the Isolation of an Unusual Palladium(I)-Palladium(II) Species
作者:Robin B. Bedford、Mairi F. Haddow、Charlotte J. Mitchell、Ruth L. Webster
DOI:10.1002/anie.201101606
日期:2011.6.6
Reducing the load: A facile palladium‐catalyzed ortho‐selective bromination and chlorination of anilides occurs under aerobic conditions at room temperature when N‐halosuccinimides (NXS) are used in the presence of p‐toluenesulfonic acid (PTSA). The orthopalladated PTSA complex is not only catalytically competent but also undergoes a reductive process to yield an unusual PdI–PdII tetramer (see structure;
减少负荷:在有氧条件下,在对甲苯磺酸(PTSA)的存在下使用N-卤代琥珀酰亚胺(NXS)时,在室温下好氧条件下,钯的催化邻位溴化和氯离子氯化很容易进行。正统的PTSA配合物不仅具有催化能力,而且还经过还原过程生成不寻常的Pd I –Pd II四聚体(见结构; Pd绿色,O红色,S黄色和C灰色)。
Palladium-catalyzed regio- and chemoselective direct desulfitative arylation of anilides with arylsulfonyl chlorides
作者:Ebrahim Kianmehr、Arezoo Tanbakouchian
DOI:10.1016/j.tet.2017.07.022
日期:2017.9
A straightforward and practical palladium-catalyzed regioselective arylation of anilides is described. This method provides a new approach to prepare 2-aminobiaryls, which are valuable precursors for the synthesis of various N-containing heterocycles, using arylsulfonyl chlorides as readily available arylating agents.
Amide-assisted radical strategy: metal-free direct fluorination of arenes in aqueous media
作者:Deqiang Liang、Yanni Li、Shulin Gao、Renlun Li、Xiangguang Li、Baoling Wang、Hai Yang
DOI:10.1039/c7gc00356k
日期:——
A metal- and initiator-free direct fluorination of arenes with the assistance of an amide group is developed. This reaction proceeded under simple aqueous conditions with good functional group tolerance and ortho–para selectivity, and is highly practical because it could be readily scaled up to a multigram-scale. At this stage, an exclusive mechanism could not be proposed, and several possibilities
Pd-Catalyzed Intermolecular <i>ortho</i>-C−H Amidation of Anilides by <i>N</i>-Nosyloxycarbamate
作者:Ka-Ho Ng、Albert S. C. Chan、Wing-Yiu Yu
DOI:10.1021/ja106364r
日期:2010.9.22
A palladium-catalyzed ortho-C-H amidation of anilides by N-nosyloxycarbamates was developed for the synthesis of 2-aminoanilines. This reaction can be carried out under relatively mildconditions and exhibits excellent regioselectivity and functional group tolerance. The amidation reaction is probably initiated by rate-limiting C-H cyclopalladation (k(H)/k(D) = 3.7) to form an arylpalladium complex