Sulfate Radical Anion (SO4•–) Mediated C(sp3)–H Nitrogenation/Oxygenation in N-Aryl Benzylic Amines Expanded the Scope for the Synthesis of Benzamidine/Oxazine Heterocycles
摘要:
A transition-metal-free, K2S2O8-mediated intra-molecular, oxidative nitrogenation/oxygenation of C(sp(3))-H in N-aryl benzylic amines followed by oxidation at the benzylic center has been developed for the synthesis of benzamidine/benzoxazine heterocycles, providing an expedient access to quinazolin-4(3H)-ones, N-aryl-2-arylbenzimidazoles, and 4H-3,1-benzoxazin-4-ones. A considerable amount of work dealing with the mechanistic study to understand the crucial intramolecular cyclization step largely favors an iminium ion as the key intermediate.
Switchable Bifunctional Bistate Reusable ZnO–Cu for Selective Oxidation and Reduction Reaction
作者:Kasturi Sarmah、Subhamoy Mukhopadhyay、Tarun K. Maji、Sanjay Pratihar
DOI:10.1021/acscatal.8b03785
日期:2019.1.4
copper loaded zinc oxide (ZnO–Cu) for its stimuli (O2/light) responsiveswitchable performance between its reduced (S-1) and oxidized (S-2) state for two antagonistic reactions, namely oxidation of alkyl arenes/heteroarenes to aldehydes/ketones and reduction of nitro arenes/heteroarenes to corresponding amines. The two states of the catalyst showed its switchable performance as highly active and poorly
在这里,我们公开了利用铜负载的氧化锌(ZnO-Cu)在两个还原反应(即氧化)的还原(S-1)和氧化(S-2)状态之间的刺激(O 2 /光)响应可转换性能。将烷基芳烃/杂芳烃还原为醛/酮,并将硝基芳烃/杂芳烃还原为相应的胺。催化剂的两种状态均显示出其可切换的性能,即用于氧化和还原的高活性和低活性催化剂,并且通过改变刺激(光和O 2 / N 2),两个反应都可以“关闭”和“打开”。)。发现状态之间的转换效率及其相对反应性在各种反应条件下均保持一致,并且无论氧化还原顺序(反之亦然)和反应中使用的底物如何,都保持不变。光催化剂(S-1和S-2)表现出良好的催化活性,多种可重复使用性,广泛的底物范围以及对两种反应均具有合理的官能团耐受性,并在大规模应用中探索了其质量性能。该系统被用于辅助串联催化装置中,用于通过催化状态之间的刺激响应切换而利用氧化和还原反应两者来合成苄胺。
Synthesis of N-benzyl-N-phenylthiophene-2-carboxamide analogues as a novel class of enterovirus 71 inhibitors
Regioselective ring nitration of N-alkyl anilines is reported using tert-butyl nitrite. The reactions proceed efficiently with a wide range of substrates providing synthetically useful N-nitroso N-alkyl nitroanilines in excellent yields which can be easily converted into N-alkyl phenylenediamines and N-alkyl nitroanilines using Zn-AcOH and HCl/MeOH, respectively.
Catalyst-free Alkylation of Aromatic Amines with Aldehydes
作者:Qi He、Zhouyu Wang、Shan Qian、Zhenju Jiang、Jianhui Li、Dehong Jiang、Wensi Ai
DOI:10.2174/1570178611310050012
日期:2013.5.1
In the absence of any additional catalysts, a series of aromatic amines were alkylated with a range of aromatic
and aliphatic aldehydes. Moderate to excellent isolated yields (up to 94%) were obtained under mild conditions.
Simultaneously, the reaction time dramatically shortened from hours to minutes when the Microwave technique was used.
amines are selectively obtained from low value starting materials using hydrogen and a non-noble metal-based catalyst. The reductive amination of aldehydes from nitroarenes or nitroalkanes is efficiently catalyzed by a well-defined diamino molybdenum sulfide cluster in a one-pot homogeneous reaction. The integrity of the molecular cluster catalyst is preserved along the process.