by homogeneous Pd-catalyzed directarylation is an important research topic in modern organic chemistry. In this study, PEPPSI-type, (PEPPSI = Pyridine Enhanced Precatalyst Preparation Stabilization and Initiation), new Pd-catalysts with N-heterocyclic carbene ligand were synthesized, and they were used as catalysts in the synthesis of bi(hetero)arenes by directarylation process. The structures of
摘要 由于双(杂)芳烃在工业上的重要性,通过均相 Pd 催化直接芳基化合成这些化合物是现代有机化学中的一个重要研究课题。本研究合成了具有 N-杂环卡宾配体的新型 Pd 催化剂,PEPPSI 型(PEPPSI = Pyridine Enhanced Precatalyst Prepared Stabilization and Initiation),并将它们用作直接合成双(杂)芳烃的催化剂。芳基化过程。Pd-卡宾配合物的结构通过不同的光谱和分析技术,如NMR、FT-IR和元素分析来阐明。通过单晶 X 射线衍射研究确定了其中一种配合物的更详细的结构特征。
Synthesis of Quinoxaline-Linked Bis(Benzimidazolium) Salts and Their Catalytic Application in Palladium-Catalyzed Direct Arylation of Heteroarenes
作者:Murat Kaloğlu、Mehmet Hanifi Şahan、Serpil Demir Düşünceli、İsmail Özdemir
DOI:10.1007/s10562-021-03787-2
日期:2022.7
synthesized as bis-N-heterocyclic carbene (NHC) precursors. These bis(NHC) precursors were used as multidentate ligands for the construction of bi(hetero)aryls by palladium-catalyzed direct C-H activation process. The in situ prepared palladium complexes by mixtures of the Pd(OAc)2 and the bis(NHC) precursors were used as the catalyst for direct C-H activation of heteroarenes. These catalytic system exhibited
New benzimidazolium N-heterocyclic carbene precursors and their related Pd-NHC complex PEPPSI-type: Synthesis, structures, DFT calculations, biological activity, docking study, and catalytic application in the direct arylation
New benzhydryl-5,6-dimethyl-(3-methylbenzyl)benzimidazolium salt as N-heterocyclic carbene precursors and their relatednew Pd-NHC complex PEPPSI-type with the general formula [PdBr2(NHC)(pyridine)] were prepared and theoretically studied. Quantum chemistry computations at the B3LYP/6-311G(d,p)/LANL2DZ level were used to examine the molecular structure, electronic characteristics, and chemical reactivity
Synthesis, structures, DFT calculations, and catalytic application in the direct arylation of five-membered heteroarenes with aryl bromides of novel palladium-N-heterocyclic carbene PEPPSI-type complexes
A new series of Pd-catalysts based on an N-heterocycliccarbene PEPPSI-type ligand (PEPPSI = pyridine enhanced precatalyst preparation stabilization and initiation) with the general formula [Pd(II)Br2(NHC)(pyridine)] was synthesized and fully characterized via spectroscopic analytical methods. Further, the structural characterization of 3a, 3b, and 3d was performed via single-crystal X-ray diffraction
Direct (Hetero)arylation of Heteroarenes Catalyzed by Unsymmetrical Pd-PEPPSI-NHC Complexes under Mild Conditions
作者:A-Xiang Song、Xiao-Xiao Zeng、Bei-Bei Ma、Chang Xu、Feng-Shou Liu
DOI:10.1021/acs.organomet.0c00494
日期:2020.10.12
Pd-PEPPSI-type NHC complexes (PEPPSI, pyridine-enhanced precatalyst preparation, stabilization, and initiation; NHC, N-heterocyclic carbene) were designed and synthesized to catalyze the directarylation of heteroarenes with (hetero)aryl bromides. The results demonstrated that the utilization of this “unsymmetrical” strategy led to much higher efficiency in comparison to the commonly used C2-symmetric