通过应用氮掺杂碳改性铁基催化剂,实现了N-杂芳烃,特别是(异)喹诺酮类化合物的受控加氢。活性的关键是通过热解碳浸渍复合材料制备催化剂,该复合材料由乙酸铁( II )和N-芳基亚氨基吡啶获得。 TEM、XRD、XPS 和拉曼光谱表明,合成的材料由 N 掺杂碳基体中的 Fe(0)、Fe 3 C 和 FeN x组成。这种坚固且易于回收的铁材料具有良好的催化活性,即使在存在可还原官能团(例如腈、卤素、酯和酰胺)的情况下,也可以选择性氢化各种(异)喹啉衍生物。为了进行概念验证,这种纳米结构催化剂被应用于天然产物和药物先导化合物的多步合成以及光致发光材料的改性中。因此,该方法构成了具有合成重要性的取代(异)喹诺酮的第一个非均相铁催化氢化。
and stable core-shell catalysts. In this respect, we present the synthesis and characterization of iron oxides surrounded by nitrogen-doped-graphene shells immobilized on carbon support (labeled FeOx@NGr-C). Active catalytic materials are obtained in a simple, scalable and two-step method via pyrolysis of iron acetate and phenanthroline and subsequent selective leaching. The optimized FeOx@NGr-C catalyst
spectroscopy, the synthesized material is composed of Fe(0), Fe3C and FeNx in a N-doped carbon matrix. The decent catalytic activity of this robust and easily recyclable Fe-material allowed for the selective hydrogenation of various (iso)quinoline derivatives, even in the presence of reducible functional groups, such as nitriles, halogens, esters and amides. For a proof-of-concept, this nanostructured
通过应用氮掺杂碳改性铁基催化剂,实现了N-杂芳烃,特别是(异)喹诺酮类化合物的受控加氢。活性的关键是通过热解碳浸渍复合材料制备催化剂,该复合材料由乙酸铁( II )和N-芳基亚氨基吡啶获得。 TEM、XRD、XPS 和拉曼光谱表明,合成的材料由 N 掺杂碳基体中的 Fe(0)、Fe 3 C 和 FeN x组成。这种坚固且易于回收的铁材料具有良好的催化活性,即使在存在可还原官能团(例如腈、卤素、酯和酰胺)的情况下,也可以选择性氢化各种(异)喹啉衍生物。为了进行概念验证,这种纳米结构催化剂被应用于天然产物和药物先导化合物的多步合成以及光致发光材料的改性中。因此,该方法构成了具有合成重要性的取代(异)喹诺酮的第一个非均相铁催化氢化。
General and Chemoselective Copper Oxide Catalysts for Hydrogenation Reactions
Copper oxidecatalysts have been prepared by pyrolysis of copper acetate on aluminum oxide. The material resulting from pyrolysis at 800 °C allows for catalytic hydrogenations at low temperature of a variety of unsaturated compounds such as quinolines, alkynes, ketones, imines, and polycyclic aromatic hydrocarbons as well as nitroarenes with good activity and selectivity.
A General and Highly Selective Cobalt-Catalyzed Hydrogenation of N-Heteroarenes under Mild Reaction Conditions
作者:Rosa Adam、Jose R. Cabrero-Antonino、Anke Spannenberg、Kathrin Junge、Ralf Jackstell、Matthias Beller
DOI:10.1002/anie.201612290
日期:2017.3.13
Herein, a general and efficientmethod for the homogeneous cobalt‐catalyzed hydrogenation of N‐heterocycles, under mild reaction conditions, is reported. Key to success is the use of the tetradentate ligand tris(2‐(diphenylphosphino)phenyl)phosphine). This non‐noble metal catalyst system allows the selectivehydrogenation of heteroarenes in the presence of a broad range of other sensitive reducible
of various nitrogenheterocycles, including but not limited to quinolines, isoquinolines, indoles and pyridinium salts, in an aqueous solution of HCO2H/HCO2Na under mild conditions. The catalyst shows excellent functional‐group compatibility and high turnover number (up to 7500), with catalyst loadings as low as 0.01 mol % being feasible. Mechanistic investigation of the quinolinereduction suggests
在温和条件下,显示出环金属化的铱络合物在HCO 2 H / HCO 2 Na的水溶液中催化各种氮杂环的转移加氢反应,包括但不限于喹啉,异喹啉,吲哚和吡啶鎓盐。该催化剂表现出出色的官能团相容性和高周转率(最高7500),催化剂用量低至0.01 mol%是可行的。对喹啉还原反应的机理研究表明,转移氢化反应是通过1,2和1,4加成途径进行的,催化转化受氢化物转移步骤的限制。