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
2,4,6‐Trimethoxypyridine is identified as an efficient ligand for promoting a Pd‐catalyzed ortho‐CHamination of both benzamides and triflyl‐protected benzylamines. This finding provides guidance for the development of ligands that can improve or enable PdII‐catalyzed CH activation reactions directed by weakly coordinating functional groups.
PALLADIUM(II)-CATALYZED SELECTIVE FLUORINATION OF BENZOIC ACIDS AND DERIVATIVES
申请人:YU JIN-QUAN
公开号:US20140018566A1
公开(公告)日:2014-01-16
A new method of ortho-fluorination for selectively fluorinating a benzoic acid or derivative compound where an aryl C—H bond is directly replaced by an aryl C—F bond is provided. The method comprises reacting a compound having the formula:
wherein X is at least one substitution group attached with a benzene ring and Ar is an aromatic substitution group comprising at least one fluorine atom,
and a mixture comprising a palladium (II) catalyst and a fluorinating reagent to form at least one of the ortho-fluorinated compounds having the formulae
with good yield and selectivity.
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
Pd(II)-Catalyzed <i>para</i>-Selective C–H Arylation of Monosubstituted Arenes
作者:Xisheng Wang、Dasheng Leow、Jin-Quan Yu
DOI:10.1021/ja206572w
日期:2011.9.7
Pd-catalyzed highly para-selective C-H arylation of monosubstituted arenes (including toluene) is developed for the first time using an F+ reagent as a bystanding oxidant. This finding provides a new retrosynthetic disconnection for para-substituted biaryl synthesis via C-H/C-H cross-coupling.