DMSO/<i>t</i>-BuONa/O<sub>2</sub>-Mediated Aerobic Dehydrogenation of Saturated <i>N</i>-Heterocycles
作者:Ruchun Yang、Shusheng Yue、Wei Tan、Yongfa Xie、Hu Cai
DOI:10.1021/acs.joc.9b03447
日期:2020.6.5
Aromatic N-heterocycles such as quinolines, isoquinolines, and indolines are synthesized via sodium tert-butoxide-promoted oxidative dehydrogenation of the saturated heterocycles in DMSO solution. This reaction proceeds under mild reaction conditions and has a good functional group tolerance. Mechanistic studies suggest a radical pathway involving hydrogen abstraction of dimsyl radicals from the N–H
A Reusable Cobalt Catalyst for Reversible Acceptorless Dehydrogenation and Hydrogenation of N‐Heterocycles
作者:Garima Jaiswal、Murugan Subaramanian、Manoj K. Sahoo、Ekambaram Balaraman
DOI:10.1002/cctc.201900367
日期:2019.5.20
base‐metals for reversible acceptorless dehydrogenation (ADH) and hydrogenation of feedstock chemicals is very important in the context of ‘hydrogen storage’. Herein, we report a highly efficient reusable cobalt‐based heterogeneous catalyst for reversibledehydrogenation and hydrogenation of N‐heterocycles. Both the ADH and the hydrogenation processes operate undermild, benign conditions.
Iron(II)‐Catalyzed Aerobic Biomimetic Oxidation of N‐Heterocycles
作者:Srimanta Manna、Wei‐Jun Kong、Jan‐E. Bäckvall
DOI:10.1002/chem.202102483
日期:2021.10
Herein, an iron(II)-catalyzed biomimetic oxidation of N-heterocycles under aerobic conditions is described. The dehydrogenation process, involving several electron-transfer steps, is inspired by oxidations occurring in the respiratory chain. An environmentally friendly and inexpensive iron catalyst together with a hydroquinone/cobalt Schiff base hybrid catalyst as electron-transfer mediator were used
Time-Resolved EPR Revealed the Formation, Structure, and Reactivity of N<i>-</i>Centered Radicals in an Electrochemical C(sp<sup>3</sup>)–H Arylation Reaction
作者:Yichang Liu、Biyin Shi、Zhao Liu、Renfei Gao、Cunlong Huang、Hesham Alhumade、Shengchun Wang、Xiaotian Qi、Aiwen Lei
DOI:10.1021/jacs.1c09341
日期:2021.12.15
over the past few years, while a vast majority of the reactions proceed through a radical pathway. Understanding the properties of radical intermediates is crucial in the mechanistic study of electrochemical transformations and will be beneficial for developing new reactions. Nevertheless, it is rather difficult to determine the “live” radical intermediates due to their high reactivity. In this work
A biomass-derived N-doped porous carbon catalyst for the aerobic dehydrogenation of nitrogen heterocycles
作者:Jing-Jiang Liu、Fu-Hu Guo、Fu-Jun Cui、Ji-Hua Zhu、Xiao-Yu Liu、Arif Ullah、Xi-Cun Wang、Zheng-Jun Quan
DOI:10.1039/d1nj05411b
日期:——
superior catalytic performance in the aerobic dehydrogenation of various heterocyclic nitrogen compounds (49 examples, up to 96% yield), similar to that of C3N4 and GO. Characterization by TEM, BET and XPS accompanied by the EPR analysis revealed that the enhanced catalytic properties of NC came from its high activation ability for both O2 and heterocyclic nitrogen, attributed to the porous structure and
N 掺杂的多孔碳 (NC) 是由甘蔗渣合成的,甘蔗渣是一种可持续且广泛使用的生物质废物。优选的 NC 样品具有发达的多孔结构、类似石墨烯的表面形态和不同的 N 种类。更重要的是,多相碳催化剂在各种杂环氮化合物的有氧脱氢反应中表现出优异的催化性能(49个例子,产率高达96%),类似于C 3 N 4和GO。TEM、BET 和 XPS 表征以及 EPR 分析表明,NC 的增强催化性能来自其对 O 2和杂环氮的高活化能力,分别归因于多孔结构和吡啶 N (N-6) 物种.