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。
First used of Alkylbenzimidazole-Cobalt(II) complexes as a catalyst for the N-Alkylation of amines with alcohols under solvent-free medium
In this study, alkylbenzimidazole-cobalt(II)-catalyzed direct N-alkylation reactions of amines with alcohols derivatives have been investigated undersolvent-free medium. For this purpose, a series of cobalt(II) complexes bearing N-alkylbenzimidazole complexes have been synthesized and novel complexes fully characterized by elemental analysis, FT-IR, 1H NMR and, 13C1H} NMR spectroscopies. Also, the
在这项研究中,已经在无溶剂的介质下研究了烷基苯并咪唑-钴(II)催化的胺与醇衍生物的直接N-烷基化反应。为此目的,已经合成了一系列带有N-烷基苯并咪唑配合物的钴(II)配合物,并且通过元素分析,FT-IR,1 H NMR和13 C 1 H} NMR光谱对新型配合物进行了充分表征。另外,配合物2a的结构已经通过X射线晶体学确认。通常,N-烷基化反应通常在甲苯中与各种金属配合物包括钴一起进行。在该配合物的催化研究中,2a-c在没有溶剂的条件下进行,醇既充当溶剂又充当反应物。相对于甲苯,在无溶剂的中等溶剂中已发现胺产物根据亚胺产物的转化率和对烷基化反应的选择性高。
Solid base catalyzed highly efficient N-alkylation of amines with alcohols in a solvent-free system
Different from any other catalytic systems containing transition metals and additives, sodium hydroxide itself was found to be a unique and effective catalyst for the solvent-free synthesis of the secondary amines via the N-alkylation of amines with alcohols. For the reaction of aniline with benzyl alcohol, 99.6 mol% conversion of aniline and 99.5% selectivity of the product were achieved under optimal
Active ruthenium(II)-NHC complexes for alkylation of amines with alcohols using solvent-free conditions
作者:Beyhan Yiğit、Emine Özge Karaca、Murat Yiğit、Nevin Gürbüz、Hakan Arslan、İsmail Özdemir
DOI:10.1016/j.poly.2019.114234
日期:2020.1
transmetallation reactions between silver(I) N-heterocyclic carbene complexes and [RuCl2(p-cymene)]2. All of the obtained complexes were characterized by FT-IR, 1H NMR and 13C NMR spectroscopy, and the molecular structure of compound 3c was also determined by X-ray crystallography. These ruthenium complexes were tested for the alkylation of aromaticamines with a wide range of primary alcohols under solvent-free
摘要通过银(I)N-杂环卡宾配合物与[RuCl2(p-cymene)] 2的金属间转移反应,制备了一系列带有苄基的N-杂环卡宾配体的钌(II)配合物。通过FT-IR,1 H NMR和13 C NMR光谱对所有获得的配合物进行表征,并且还通过X射线晶体学测定化合物3c的分子结构。在无溶剂条件下,使用氢借用策略对这些钌配合物进行了芳香胺与多种伯醇烷基化的测试。此处测试的所有化合物对这些反应均显示出优异的催化活性,并且使用2.5摩尔%的钌络合物选择性地获得了N-单烷基化产物。
Benzimidazolium sulfonate ligand precursors and application in ruthenium-catalyzed aromatic amine alkylation with alcohols
New benzimidazolium sulfonate salts have been prepared and fully characterized. They have been associated in situ with [RuCl2(p-cymene)]2 to generate efficient catalytic systems operating at 120 °C under neat conditions in the presence of potassium tert-butylate for selective N-alkylation of primary aromatic amines into secondary amines.