Copper-mediated C H thiolation of (hetero)arenes using weakly coordinating directing group
作者:Peng Wu、Tai-Jin Cheng、Hai-Xia Lin、Hui Xu、Hui-Xiong Dai
DOI:10.1016/j.tetlet.2020.152062
日期:2020.7
We have developed a copper-mediated CH thiolation of (hetero)arenes by usingmonodentate amide as weakly coordinating directinggroup. This protocol features excellent functional group tolerance and shows satisfactory compatibility with various heterocycles, such as indole, pyrrole, imidazole, pyridine, thiophene and quinoline. The robust nature of this protocol renders that it has potential value
Pd-Catalyzed Intermolecular C–H Amination with Alkylamines
作者:Eun Jeong Yoo、Sandy Ma、Tian-Sheng Mei、Kelvin S. L. Chan、Jin-Quan Yu
DOI:10.1021/ja202563w
日期:2011.5.25
C-H amination of N-arylbenzamides with O-benzoyl hydroxylamines has been achieved with either Pd(II) or Pd(0) catalysts. Furthermore, we demonstrate that secondary amines can be directly used with benzoyl peroxide in a one-pot procedure that proceeds via the in situ generation of the appropriate O-benzoyl hydroxylamines. This catalytic reaction provides a new disconnection for the convergent synthesis
A Pd(II)-catalyzed trifluoromethylation of ortho C-H bonds with an array of N-arylbenzamides derived from benzoic acids is reported. N-Methylformamide has been identified as a crucial promoter of C-CF3 bond formation from the Pd center. X-ray characterization of the C-H insertion intermediate has revealed a rare coordination mode of acidic amides as directing groups and the origin of their capacity in directing C-H activation.
Pd-Catalyzed Oxidative <i>ortho</i>-C–H Borylation of Arenes
作者:Hui-Xiong Dai、Jin-Quan Yu
DOI:10.1021/ja2097095
日期:2012.1.11
The development of a Pd-catalyzed oxidative ortho-C-H borylation with N-arylbenzamides is reported. A modified dibenzylideneacetone (dba) ligand, a weak base, and a strong oxidant are critical for obtaining good yields. The reaction is tolerant of electron-deficient and electron-rich benzamides derived from readily available benzoic acids. The borylated products can be converted to various synthons via diverse transformations.