N-取代的苯胺是广泛使用的重要化合物,其多样化合成方法的发展具有重要意义。在本文中,我们已经成功地开发了广泛适用于N-取代苯胺的强大催化路线。在金-钯合金纳米粒子催化剂(Au-Pd / Al 2 O 3)和苯乙烯的存在下,可以从环己酮和胺(包括脂肪族伯胺)开始合成各种结构多样的N-取代苯胺(23个例子)和仲胺和苯胺)。催化性能受到催化剂性质的强烈影响。负载型金催化剂(Au / Al 2 O 3)对于当前的转换完全无效。尽管负载型钯催化剂(Pd / Al 2 O 3)在某种程度上给出了所需的N-取代苯胺,但其性能却不如Au-Pd / Al 2 O 3。Au-Pd / Al 2 O 3中的钯物种的催化活性至少约为。是Pd / Al 2 O 3的三倍。此外,Au–Pd / Al 2 O 3的性能优于Au / Al 2 O 3和Pd / Al 2 O的物理混合物的性能。3。因此,钯对于本转化(脱氢
established for the preparation of phenothiazines in good yields by two routes, starting from 2-iodoanilines and 2-bromobenzenethiol and from aryl ortho-dihalides and o-aminobenzenethiols, by conducting the reaction at 90 °C in poly(ethylene glycol)-100 (PEG-100). In addition, the catalyst system was useful for promoting direct arylation of various aryl amines, aliphatic amines, and aqueous ammonia. The simple
Mimicking transition metals in borrowing hydrogen from alcohols
作者:Ananya Banik、Jasimuddin Ahmed、Swagata Sil、Swadhin K. Mandal
DOI:10.1039/d1sc01681d
日期:——
Borrowinghydrogen from alcohols, storing it on a catalyst and subsequent transfer of the hydrogen from the catalyst to an in situ generated imine is the hallmark of a transition metal mediated catalytic N-alkylation of amines. However, such a borrowinghydrogen mechanism with a transition metal free catalytic system which stores hydrogen molecules in the catalyst backbone is yet to be established
从醇中借用氢气,将其储存在催化剂上,然后将氢气从催化剂转移到原位生成的亚胺,这是过渡金属介导的胺催化N-烷基化的标志。然而,这种在催化剂主链中储存氢分子的无过渡金属催化系统的借氢机制尚未建立。在此,我们证明苯酚基配体可以模仿过渡金属在储存和转移氢分子中的作用,从而导致借氢介导的醇类苯胺烷基化,包括广泛的底物范围。通过各种光谱技术、氘标记实验和 DFT 研究表征几种中间体,对机制途径进行了仔细检查,得出的结论是,基于苯酚基的主链通过脱芳构化过程依次添加 H + 、 H˙ 和一个电子,随后将其用作还原剂。相当于催化方式中的C-N双键。
Sulfonato-Cu(salen) Complex Catalyzed N-Arylation of Aliphatic Amines with Aryl Halides in Water
catalyzed procedure for the N-arylation of simple aliphatic amines, amino alcohols and amino acids in pure water have been developed. A variety of substituted aryl iodides, bromides and electron-deficient chlorides were found to be applicable, and 1,2-disubstituted benzimidazoles could be prepared easily by a cascade amination/condensation process in this catalyticsystem.
N-Alkylation of amines with phenols over highly active heterogeneous palladium hydride catalysts
作者:Long Yan、Xin-Xin Liu、Yao Fu
DOI:10.1039/c6ra22383d
日期:——
secondary amines in considerable yield via hydrogenation and amination tandem reaction over Al2O3 supportedpalladium hydride (PdHx) bi-functional catalyst. Note that this system proceeds efficiently with mild conditions under H2 atmosphere, which was difficult to achieve in previous reports. The catalyst and the mechanism of reaction are both studied. Furthermore, various secondary amines can be formed
通过在Al 2 O 3负载的氢化钯(PdH x)双功能催化剂上进行氢化和胺化串联反应,苯酚以可观的收率直接转化为仲胺。请注意,该系统在H 2气氛中的温和条件下有效运行,这在以前的报告中很难实现。研究了催化剂和反应机理。此外,在该转化体系下可以高产率形成各种仲胺。
Facile access to N-substituted anilines via dehydrogenative aromatization catalysis over supported gold–palladium bimetallic nanoparticles
and amines to produce enamines (or ketimines), followed by the dehydrogenative aromatization to produce the corresponding N-substitutedanilines. In the aromatization step, styrene could act as an effective hydrogen acceptor to selectively produce the desired N-substitutedanilines without catalyzing the disproportionation of the enamine intermediates. The observed catalysis using Au–Pd/Al2O3 was truly
N-取代的苯胺是广泛使用的重要化合物,其多样化合成方法的发展具有重要意义。在本文中,我们已经成功地开发了广泛适用于N-取代苯胺的强大催化路线。在金-钯合金纳米粒子催化剂(Au-Pd / Al 2 O 3)和苯乙烯的存在下,可以从环己酮和胺(包括脂肪族伯胺)开始合成各种结构多样的N-取代苯胺(23个例子)和仲胺和苯胺)。催化性能受到催化剂性质的强烈影响。负载型金催化剂(Au / Al 2 O 3)对于当前的转换完全无效。尽管负载型钯催化剂(Pd / Al 2 O 3)在某种程度上给出了所需的N-取代苯胺,但其性能却不如Au-Pd / Al 2 O 3。Au-Pd / Al 2 O 3中的钯物种的催化活性至少约为。是Pd / Al 2 O 3的三倍。此外,Au–Pd / Al 2 O 3的性能优于Au / Al 2 O 3和Pd / Al 2 O的物理混合物的性能。3。因此,钯对于本转化(脱氢