cis-Fashioned palladium (II) complexes of 2-phenylbenzimidazole ligands: Synthesis, characterization, and catalytic behavior towards Suzuki–Miyaura reaction
摘要:
Reaction of 2-arylbenzimidazole with PdCl2(CH3CN)(2) in CH2Cl2 affords benzimidazole palladium (II) complexes in high yields. The structure of complexes C1, C2, and C3 has been confirmed by X-ray structure analysis. The configuration of complexes depends on the substituent on the 2-position of benzimidazole. Phenyl affords the complexes in cis-fashion due to pi-pi stacking of phenyl and benzimidazole. Tolyl affords the complex in trans-fashion. The catalytic studies show that cis-configured 2-phenylbenzimidazole palladium (II) complexes are highly efficient catalysts in the Suzuki-Miyaura reaction. (C) 2008 Elsevier B.V. All rights reserved.
Nickel-Catalyzed Heteroarenes Cross Coupling via Tandem C–H/C–O Activation
作者:Ting-Hsuan Wang、Ram Ambre、Qing Wang、Wei-Chih Lee、Pen-Cheng Wang、Yuhua Liu、Lili Zhao、Tiow-Gan Ong
DOI:10.1021/acscatal.8b03436
日期:2018.12.7
Inert aryl methyl ethers as coupling components via C–O activation have been established with a Ni catalyst for C–H activation of heteroarene. The key to simultaneous C–H/C–O bond activation is the use of sterically demanding o-tolylMgBr. The protocol is effective for a wide scope of substrates including naphthyl methyl ethers, anisoles, and a variety of other heteroarene derivatives. Detailed mechanistic
Heterogeneouscopper catalysis enabled photoinducedC−Harylations under exceedingly mild conditions at room temperature. The versatile hybridcoppercatalyst provided step‐economical access to arylated heteroarenes, terpenes and alkaloid natural products with various aryl halides. The hybridcoppercatalyst could be reused without significant loss of catalytic efficacy. Detailed studies in terms of
Optimal Balance in the Catalyst Dynamics Enables C(2)−H Arylation of (Benz)imidazoles and (Benz)oxazoles by an
<i>In Situ</i>
‐Generated Ni/NHC System
作者:Oleg V. Khazipov、Konstantin E. Shepelenko、Safarmurod B. Soliev、Ksenia A. Nikolaeva、Victor M. Chernyshev、Valentine P. Ananikov
DOI:10.1002/cctc.202201055
日期:2022.12.20
C(2)−Harylation of (benz)imidazoles and (benz)oxazoles with aryl chlorides and aryl bromides catalyzed by a Ni/NHCsystemgenerated in situ from cheap air-tolerant precursors without using special Ni(II) reductants has been developed.
Photoinduced C–H arylation of 1,3-azoles via copper/photoredox dual catalysis
作者:Sven Trienes、Jiawei Xu、Lutz Ackermann
DOI:10.1039/d4sc00393d
日期:——
The visible light-induced C–Harylation of azoles has been accomplished by dual-catalytic system with the aid of an inexpensive ligand-free copper(I)-catalyst in combination with a suitable photoredox catalyst. An organic photoredox catalyst, 10-phenylphenothiazine (PTH), was identified as effective, cost-efficient and environmentally-benign alternative to commonly-used, expensive Ir(III)-based complexes
可见光诱导的唑类 C-H 芳基化反应是通过双催化系统借助廉价的无配体铜 ( I ) 催化剂与合适的光氧化还原催化剂的结合来完成的。有机光氧化还原催化剂 10-苯基吩噻嗪 (PTH) 被认为是常用、昂贵的 Ir( III ) 基络合物的有效、经济且环保的替代品。该方法被证明适用于各种唑衍生物的C-H芳基化,包括恶唑、苯并恶唑、噻唑、苯并噻唑以及更具挑战性的咪唑和苯并咪唑。此外,复杂分子的衍生化和天然产物Balsoxin的克级合成反映了所开发策略的合成效用。机理研究表明以芳基自由基为关键中间体的单电子转移(SET)机制。
An Efficient Arylation of Benzoazoles with Aryl Bromides by a Practical Palladium-Copper Cocatalytic System
作者:Zhi-Zhen Huang、Xue-Ming Yan、Xue-Rong Mao
DOI:10.3987/com-11-12176
日期:——
A practical, efficient Pd(OAc)(2)/Cu(II)/PPh3 cocatalytic system has been developed. With only 1 mol% Pd(OAc)(2), 20 mol% copper(II) salt, and 0.5 equiv of inexpensive PPh3 as ligand, the direct arylation of benzoazoles with aryl bromides could be performed smoothly in mild condition, affording the desired arylated benzoazoles in good yields (75-93%).