Intramolecular arylation of benzimidazoles via Pd(II)/Cu(I) catalyzed cross-dehydrogenative coupling
摘要:
Electron poor benzimidazole substrates were arylated via an intramolecular cross-dehydrogenative coupling (CDC) reaction. These CDC reactions were catalyzed by a Pd(II)/Cu(I) catalyst system, capable of producing moderate yields on a large library of substrates. The substrate scope consisted of tethered arene-benzimidazoles that upon coupling, produced a fused polycyclic motif. (C) 2014 Elsevier Ltd. All rights reserved.
Ruthenium(II)‐(Arene)‐N‐Heterocyclic Carbene Complexes: Efficient and Selective Catalysts for the
<i>N</i>
‐Alkylation of Aromatic Amines with Alcohols
characterized by 1 H NMR, 13 C NMR and FT-IR spectroscopy techniques. The catalytic activity of the ruthenium complexes has been evaluated with respect to the mono-N-alkylation reactions of aromatic amines with various alcohol derivatives under solvent-free conditions at 120 o C using the borrowing hydrogen strategy.
一系列不对称的 1,3-二取代苯并咪唑氯化物被合成为 N-杂环卡宾 (NHC) 前体。这些化合物用于合成 [RuCl2(芳烃)(NHC)] 类型的新型钌 (II) 配合物,(芳烃 = η 6-p-伞花烃)。所有化合物的结构均通过 1 H NMR、 13 C NMR 和 FT-IR 光谱技术表征。使用借氢策略,在无溶剂条件下,在 120 o C 下,对芳香胺与各种醇衍生物的单-N-烷基化反应评估了钌配合物的催化活性。
Palladium(II)- N -heterocyclic carbene-catalyzed direct C2- or C5-arylation of thiazoles with aryl bromides
作者:Murat Kaloğlu、İsmail Özdemir
DOI:10.1016/j.tet.2018.03.026
日期:2018.6
their corresponding palladium(II)-NHC complexes with the general formula [PdCl2(NHC)2] were synthesized. All new compounds were characterized by 1H NMR, 13C NMR, IR spectroscopy and elemental analysis techniques. The catalytic activity of palladium(II)-NHC complexes was investigated in the direct C2- or C5-arylation of thiazoles with aryl bromides in presence of palladium(II)-NHC at 150 °C for 1 h. These
在此我们报道,合成了一系列新的苯并咪唑氯化物作为N-杂环卡宾(NHC)配体及其相应的通式为[PdCl 2(NHC)2 ]的钯(II)-NHC配合物。所有新化合物均通过1 H NMR,13 C NMR,IR光谱和元素分析技术进行表征。在钯(II)-NHC的存在下于150°C进行1 h的噻唑与芳基溴的直接C2-或C5-芳基化反应中,研究了钯(II)-NHC配合物的催化活性。这些配合物对噻唑直接芳基化表现出良好的催化性能。噻唑的芳基化以中等至高产率选择性地产生C 2或C 5芳基化的噻唑。
N-heterocyclic carbene based ruthenium complexes for selective β-C(sp3)-H functionalization of N-fused saturated cyclic amines
作者:Nazan Kaloğlu
DOI:10.1016/j.tet.2018.12.049
日期:2019.4
Herein, a series of new ruthenium(II) complexes with the general molecular formula [RuCl2(arene)(NHC)], (arene = η6-p-cymene, NHC = N-heterocyclic carbene) were synthesized from in situ prepared silver(I)-NHCs by the transmetallation method. These complexes were fully characterized by analytical and spectral methods. Ruthenium(II) complexes were tested as promising catalyst for selective β-C(sp3)-H
在本文中,与一般分子式将[RuCl了一系列新的钌(II)络合物2(芳烃)(NHC)],(芳烃= η 6 - p -cymene,NHC = Ñ -杂环卡宾)从合成原位制备通过过渡金属化法制备银(I)-NHC。这些配合物已通过分析和光谱方法进行了全面表征。钌(II)配合物被测试为在外部酸性添加剂存在下通过氢转移将N-甲基哌啶与各种醛选择性进行β-C(sp 3)-H官能化的有前途的催化剂。这些环保的交叉脱氢偶联剂可以生产C(3)-烷基化的N-不带烯胺的-甲基哌啶衍生物,仅二氧化碳和水为良性副产物。
PEPPSI-Pd-NHC catalyzed Suzuki-Miyaura cross-coupling reactions in aqueous media
作者:Nazan Kaloğlu、İsmail Özdemir
DOI:10.1016/j.tet.2019.02.062
日期:2019.4
precursors. These compounds were used to synthesize of the PEPPSI-typepalladium NHC complexes. The structures of all compounds were characterized by 1H NMR, 13C NMR, FT-IR spectroscopy and elemental analyses. The catalytic activity of the PEPPSI-type palladium–NHC complexes has been evaluated with respect to the Suzuki-Miyauracross-couplingreactions of phenyl boronic acid with various aryl halides in aqueous
合成了一系列不对称的1,3-二取代的苯并咪唑氯化物作为N杂环卡宾(NHC)前体。这些化合物用于合成PEPPSI型钯NHC复合物。所有化合物的结构均通过1 H NMR,13 C NMR,FT-IR光谱和元素分析表征。关于苯基硼酸与各种芳基卤化物在水性介质中的Suzuki-Miyaura交叉偶联反应,已经评估了PEPPSI型钯-NHC复合物的催化活性。
Synthesis and investigation of catalytic activity of phenylene – And biphenylene bridged bimetallic Palladium-PEPPSI complexes
作者:Fatma İmik、Sedat Yaşar、İsmail Özdemir
DOI:10.1016/j.jorganchem.2019.06.019
日期:2019.9
steric properties were used on the synthesis of bridged bimetallic NHC–Pd-PEPPSI (PEPPSI: Pyridine Enhanced Precatalyst Preparation Stabilization Initiation) complexes. The catalyticproperties of the bridged bimetallic NHC–Pd-PEPPSI complexes were investigated in the different C–C coupling reaction such as Suzuki-Miyaura reactions of arylbromides with arylboronic acid, the Heck coupling reactions of
据报道,一系列苯和联苯桥连的N-杂环卡宾(NHC)及其双金属NHC-Pd-PEPPSI配合物,并通过1 H NMR进行了全面表征,1313 C NMR,HRMS,FTIR和元素分析。具有不同电子和空间特性的N标签被用于合成桥联的双金属NHC-Pd-PEPPSI(PEPPSI:吡啶增强的前催化剂制备稳定起始)复合物。在不同的C–C偶联反应(例如芳基溴化物与芳基硼酸的Suzuki-Miyaura反应,芳基溴化物与苯乙烯的Heck偶联反应以及Sonogashira反应)中研究了桥接的双金属NHC-Pd-PEPPSI配合物的催化性能。芳基溴化物与苯乙炔。通常,所有桥接的双金属NHC-Pd-PEPPSI配合物在C-C偶联反应中均表现出良好的催化活性。