通过在催化性Pd(OAc)2和K 2 S 2 O 8作为氧化剂的存在下,通过对苯甲酸酯的芳基邻-sp 2 C-H键进行氧化偶联,成功地完成了2,2'-双苯胺的制备。在室温(25°C)下在MsOH / CF 3 CO 2 H(TFA)中溶解。在这些偶联反应中,被各种给电子或吸电子基团取代的苯甲酸酯的芳环是可容忍的。
We report the first introduction of 2-bromo-3,3,3-trifluoropropene (BTP) by directed C–H bond functionalization. The developed method gives straightforward access to α-(trifluoromethyl)styrene derivatives without prior prefunctionalization of the substrates. This palladium-catalysed transformation was applied to a broad range of substrates, and the corresponding trifluoromethylated products were obtained
Rhodium-Catalyzed Oxidative Benzannulation of<i>N</i>-Pivaloylanilines with Internal Alkynes through Dual C−H Bond Activation: Synthesis of Highly Substituted Naphthalenes
作者:Xuan Zhang、Xiaoqiang Yu、Xiujuan Feng、Yoshinori Yamamoto、Abdulrahman I. Almansour、Natarajan Arumugam、Raju Suresh Kumar、Ming Bao
DOI:10.1002/asia.201601131
日期:2016.11.22
An efficient method was developed for the synthesis of highly substitutednaphthalenes through rhodium‐catalyzed oxidative benzannulation of N‐pivaloylanilines with internal alkynes. The benzannulation reaction proceeded smoothly through dual C−H bond activation to produce the corresponding highly substitutednaphthalene products in satisfactory to good yields.
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)。
A Meta-Selective Copper-Catalyzed C–H Bond Arylation
作者:Robert J. Phipps、Matthew J. Gaunt
DOI:10.1126/science.1169975
日期:2009.3.20
For over a century, chemical transformations of benzenederivatives have been guided by the high selectivity for electrophilic attack at the ortho/para positions in electron-rich substrates and at the meta position in electron-deficient molecules. We have developed a copper-catalyzed arylation reaction that, in contrast, selectively substitutes phenyl electrophiles at the aromatic carbon–hydrogen sites
Hypervalent Iodine Mediated <i>para</i>-Selective Fluorination of Anilides
作者:Tian Tian、Wen-He Zhong、Shuai Meng、Xiang-Bao Meng、Zhong-Jun Li
DOI:10.1021/jo302099d
日期:2013.1.18
A metal-free method for the direct regioselective fluorination of anilides has been developed. In the presence of bis(tert-butylcarbonyloxy)iodobenzene (PhI(OPiv)(2)) and hydrogen fluoride-pyridine, the para-fluorination products of anilides were obtained in moderate to good yields. Because of its operational safety and the use of readily available reagents, this new procedure provides facile access to a variety of para-fluorinated anilides.