A new strategy for catalytic functionalization of C-H bonds by means of electrochemical oxidation is described. Combination of palladium-catalyzed aromatic C-H bond cleavage and halogenation with electrochemically generated halonium ions enables highly efficient, selective halogenations of aromatic compounds in a green-sustainable manner. The required reagents for this reaction are an arene and an
Copper(ii)-catalyzed ortho-functionalization of 2-arylpyridines with acyl chlorides
作者:Wenhui Wang、Changduo Pan、Fan Chen、Jiang Cheng
DOI:10.1039/c0cc05557c
日期:——
Copper-catalyzed ortho-benzoxylation of 2-arylpyridine sp2 C–H bonds with acyl chloride is described. Notably, switching the base from t-BuOK to Li2CO3 causes chlorination of the C–H bond to take place.
The first example of a Cu-promoted ortho -chlorination of aryl C–H bonds by using TMSCCl 3 as chlorinating agent is reported. This reaction features a high selectivity toward monochlorination over dichlorination, compatibility with a variety of functional groups, and gram-scale synthesis.
报道了使用 TMSCCl 3 作为氯化剂对芳基 C-H 键进行 Cu 促进邻位氯化的第一个例子。该反应的特点是单氯化比二氯化具有高选择性、与多种官能团的相容性以及克级合成。
Arylmethyl Chlorides: New Bifunctional Reagents for Palladium-Catalyzed<i>ortho</i>-Chlorination and Acylation of 2-Arylpyridines
AbstractA chemoselective, palladium‐catalyzed, ligand‐directed ortho‐CH chlorination and acylation process has been developed, exhibiting high regioselectivity for 2‐arylpyridines bearing a meta‐substituent. Worthy of note is the fact that arylmethyl chlorides as new, readily available, and inexpensive reagents can selectively be utilized as chlorine or acyl sources.magnified image