Efficient nickel-catalysed<i>N</i>-alkylation of amines with alcohols
作者:Anastasiia Afanasenko、Saravanakumar Elangovan、Marc C. A. Stuart、Giuseppe Bonura、Francesco Frusteri、Katalin Barta
DOI:10.1039/c8cy01200h
日期:——
selective N-alkylation of amines with alcohols, that is in situ generated from Ni(COD)2 and KOH under ligand-free conditions. This novel method is very efficient for the functionalization of aniline and derivatives with a wide range of aromatic and aliphatic alcohols as well as diols and exhibits excellent functionalgroup tolerance including halides, benzodioxane and heteroaromatic groups. Several TEM measurements
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。
Rhenium‐Loaded TiO
<sub>2</sub>
: A Highly Versatile and Chemoselective Catalyst for the Hydrogenation of Carboxylic Acid Derivatives and the N‐Methylation of Amines Using H
<sub>2</sub>
and CO
<sub>2</sub>
作者:Takashi Toyao、S. M. A. H. Siddiki、Yoshitsugu Morita、Takashi Kamachi、Abeda S. Touchy、Wataru Onodera、Kenichi Kon、Shinya Furukawa、Hiroko Ariga、Kiyotaka Asakura、Kazunari Yoshizawa、Ken‐ichi Shimizu
DOI:10.1002/chem.201702801
日期:2017.10.20
we report a heterogeneous TiO2‐supported Re catalyst (Re/TiO2) that promotes various selective hydrogenation reactions, which includes the hydrogenation of esters to alcohols, the hydrogenation of amides to amines, and the N‐methylation of amines, by using H2 and CO2. Initially, Re/TiO2 was evaluated in the context of the selective hydrogenation of 3‐phenylpropionic acid methyl ester to afford 3‐phenylpropanol
本文中,我们报告了一种多相TiO 2负载的Re催化剂(Re / TiO 2),该催化剂可促进各种选择性加氢反应,包括通过酯加氢成醇,酰胺加氢成胺以及胺的N-甲基化。使用H 2和CO 2。最初,在3-苯基丙酸甲酯选择性加氢制得3-苯基丙醇(p = 5 MPa,T = 180°C)的条件下评估了Re / TiO 2,它显示出优于其他催化剂的性能。在这项研究中进行了测试。与其他典型的非均相催化剂相比,Re / TiO 2的加氢反应没有产生脱芳香化的副产物。DFT研究表明,有利于芳环氢化的高选择性的醇形成是由于Re对COOCH 3基的亲和力高于对苯环的亲和力。此外,Re / TiO 2对氢化反应显示出较宽的基材范围(19个实施例)。随后,将该Re / TiO 2催化剂应用于酰胺的氢化,胺的N-甲基化以及胺与羧酸或酯的N-烷基化。
A BEt<sub>3</sub>-Base Catalyst for Amide Reduction with Silane
herein is the development of a simple but practical catalytic system for the selective reduction of amides with hydrosilane or hydrosiloxane. Low-cost and readily available triethylborane (1.0 M in THF), in combination with a catalytic amount of an alkali metal base, was found to catalyze the reduction of all three amide classes (tertiary, secondary, and primary amides) to form amines under mild conditions
Cobalt–Rhodium Heterobimetallic Nanoparticle-Catalyzed N-Alkylation of Amines with Alcohols to Secondary and Tertiary Amines
作者:Hyunho Chung、Young Keun Chung
DOI:10.1021/acs.joc.8b01109
日期:2018.8.3
selectively catalyze both mono- and bis-N-alkylation through the coupling of simple alcohols with amines, yielding a range of secondary and tertiary amines in good to excellent isolated yields. The reaction can be applied to benzyl alcohol with optically active 1-phenylethan-1-amines, and secondary amines were isolated in quantitative yields with an excellent enantiomeric excess (ee > 94%). Selectivity