Convenient and Reusable Manganese‐Based Nanocatalyst for Amination of Alcohols
作者:Murugan Subaramanian、Palmurukan M. Ramar、Ganesan Sivakumar、Ravishankar G. Kadam、Martin Petr、Radek Zboril、Manoj B. Gawande、Ekambaram Balaraman
DOI:10.1002/cctc.202100635
日期:2021.10.19
Nanocatalytic Amination: Herein, a reusable heterogeneous N-doped graphene-based manganesenanocatalyst (Mn@NrGO) for selective N-alkylation of amines with alcohols is described. The heterogeneous nature of the catalyst made it easy to separate for long-term performance, and the recycling study revealed that the catalyst was robust and retained its activity after several recycling experiments.
General Synthesis of <i>N</i>-Alkylation of Amines with Secondary Alcohols via Hydrogen Autotransfer
作者:Murugan Subaramanian、Siba P. Midya、Palmurukan M. Ramar、Ekambaram Balaraman
DOI:10.1021/acs.orglett.9b02990
日期:2019.11.15
Direct catalytic N-alkylation of amines with secondary alcohols via hydrogen autotransfer (HA) strategy is very challenging and has been scarcely reported, even under precious metal catalysis. Herein, an efficient N-alkylation of amines, including benzylamines using secondary alcohols as alkylating agents, is reported. This reaction is catalyzed by a molecularly defined NNN-Ni(II) pincercomplex, and
The reaction of α-diketones with primary heteroaromatic amines.Synthesis and reactions of imidazo[1, 2-a]pyridin-3(2H)-ones and N-heteroaryl α-iminoketones
作者:Benito Alcaide、Joaquin Plumet、Miguel A. Sierra
DOI:10.1016/s0040-4020(01)89152-3
日期:1989.1
α-diketones with various primary heteroaromatic amines including pyridine, diazine, and azole derivatives has been studied. Benzils react with 2-amino-pyridines to give 2, 2-diarylimidazo[1, 2-a]pyridin-3(2H)-ones 1 as stable products, in good yields. With the other aminoheterocycles only N-heteroaryl-α-iminoketones 4 are obtained when the reaction takes place. On the contrary, biacetyl and 1-phenyl-1
已经研究了α-二酮与各种伯杂芳族胺(包括吡啶,二嗪和唑衍生物)的反应。苯与2-氨基吡啶反应,以稳定的收率得到2,2-diarylimidazo [1,2- a ] pyridin-3(2 H)-ones 1作为稳定的产物。当其他氨基杂环发生反应时,仅获得N-杂芳基-α-亚氨基酮4。相反,联乙酰基和1-苯基-1,2-丙二酮仅与2-氨基吡啶反应,分别得到未鉴定的联乙酰自缩合产物和α-酮缩醛5。此外,化合物1的一些新反应 有保留或没有保留双环结构的报道。
Ruthenium-Catalyzed Dehydrogenative Functionalization of Alcohols to Pyrroles: A Comparison between Metal–Ligand Cooperative and Non-cooperative Approaches
作者:Amit Kumar Guin、Rakesh Mondal、Gargi Chakraborty、Subhasree Pal、Nanda D. Paul
DOI:10.1021/acs.joc.2c00311
日期:2022.6.3
alcohols to further dehydrogenative functionalization of alcohols to various substituted pyrroles to understand the advantages/disadvantages of the metal–ligand cooperative approach. Various substituted pyrroles were prepared via dehydrogenative coupling of secondary alcohols and amino alcohols, and the N-substituted pyrroles were synthesized via dehydrogenative coupling of aromatic amines with cis-2-butene-1
在此,我们报告了两种钌基钳型催化剂 [ 1 ]X (X = Cl, PF 6 ) 和2 的合成和表征,其中包含两种不同的三齿钳型配体 2-吡唑基-(1,10-菲咯啉) ( L 1 ) 和 2-芳偶氮基-(1,10-菲咯啉) ( L 2a/2b , L 2a = 2-(苯基二氮烯基)-1,10-菲咯啉; L 2b = 2-((4-氯苯基)二氮烯基)-1,10-菲咯啉),以及它们在通过脱氢醇官能化反应合成取代吡咯中的应用。在催化剂 [ 1 ]X (X = Cl, PF 6),三齿支架 2-pyrazolyl-(1,10-phenanthroline) ( L 1 ) 显然是无氧化还原的,所有的氧化还原事件都发生在金属中心,配体仍然是旁观者。相反,在催化剂2a和2b,协调的偶氮芳族支架具有高度的氧化还原活性,并且已知在醇的脱氢过程中积极参与。对这两种催化剂的催化活性进行了比较,从醇的简单脱氢到醇
<i>N</i>-Alkylation of Amines by C1–C10 Aliphatic Alcohols Using A Well-Defined Ru(II)-Catalyst. A Metal–Ligand Cooperative Approach
作者:Amit Kumar Guin、Subhasree Pal、Subhajit Chakraborty、Santana Chakraborty、Nanda D. Paul
DOI:10.1021/acs.joc.3c00313
日期:2023.5.5
A Ru(II)-catalyzed efficient and selective N-alkylation of amines by C1–C10 aliphatic alcohols is reported. The catalyst [Ru(L1a)(PPh3)Cl2] (1a) bearing a tridentate redox-active azo-aromatic pincer, 2-((4-chlorophenyl)diazenyl)-1,10-phenanthroline (L1a) is air-stable, easy to prepare, and showed wide functional group tolerance requiring only 1.0 mol % (for N-methylation and N-ethylation) and 0.1 mol