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
Salen-based hypercrosslinked polymer-supported Pd as an efficient and recyclable catalyst for C–H halogenation
In this work, we report the first use of a salen-based hypercrosslinked polymer-supportedPdcatalyst to carry out C-H halogenation. This catalyst can effectively catalyze C-H bromination and chlorination even better than its homogeneous counterpart Pd(OAc)2. It also showed excellent reusability without loss of catalytic activity for ten cycles. A broad substrate scope was explored and moderate to
Investigating the mechanism of Ni-mediated trifluoromethylthiolation of aryl halides using AgSCF<sub>3</sub>
作者:Weiling Chiu、Ben E. Nadeau、Brian O. Patrick、Jennifer A. Love
DOI:10.1039/d2dt03758k
日期:——
mechanism of the Ni-catalysed trifluoromethylthiolation of aryl chlorides using AgSCF3 is studied herein. A variety of IPr NiII complexes were synthesized via oxidative addition of Ni0 to 2-(2-chloro)phenylpyridines. Their reactivity with AgSCF3 was tested by performing stoichiometric experiments, cyclic voltammetry, and NMR spectroscopic studies. CuSCF3 was shown to behave similarly to AgSCF3, while reactions
本文研究了使用 AgSCF 3 的镍催化芳基氯三氟甲基硫醇化反应的机理。通过将Ni 0氧化加成到 2-(2-氯) 苯基吡啶,合成了多种 IPr Ni II配合物。它们与 AgSCF 3的反应性通过化学计量实验、循环伏安法和核磁共振光谱研究进行了测试。CuSCF 3显示出与 AgSCF 3类似的行为,而与 NMe 4 SCF 3的反应揭示了形成氟化镍络合物的主要化学计量副反应。NMR 动力学研究表明,苯基或吡啶基上的对位取代基的吸电子/供电子性质与相应产物的形成之间几乎没有相关性。循环伏安法 (CV) 表明 Ni I /Ni III跃迁的可行性,并且随着溶剂极性的增加观察到产物形成速率增加。证据表明,该机制通过从 AgSCF 3到 Ni II的内球电子转移 (ET)进行,最终导致三氟甲基硫醇化产物的形成。