Reaction des nitrones avec les chlorures d'acides: action de chlorures d'aryl-sulfonyles et du chlorure de benzoyle sur des n-oxy (aryl-1 dihydro-3,4 isoquinoleines). Formation d'une isoquinoleine, d'un isocarbostyryle ou d'une indoline selon les conditions
Reaction des nitrones avec les chlorures d'acides: action de chlorures d'aryl-sulfonyles et du chlorure de benzoyle sur des n-oxy (aryl-1 dihydro-3,4 isoquinoleines). Formation d'une isoquinoleine, d'un isocarbostyryle ou d'une indoline selon les conditions
Metal-Free Solvent Promoted Oxidation of Benzylic Secondary Amines to Nitrones with H<sub>2</sub>O<sub>2</sub>
作者:Álisson Silva Granato、Giovanni Wilson Amarante、Javier Adrio
DOI:10.1021/acs.joc.1c01888
日期:2021.10.1
An environmentally benign protocol for the generation of nitrones from benzylic secondary amines via catalyst-free oxidation of secondary amines using H2O2 in MeOH or CH3CN is described. This methodology provides a selective access to a variety of C-aryl nitrones in yields of 60 to 93%. Several studies have been performed to shed light on the reaction mechanism and the role of the solvent.
描述了一种环境友好的方案,用于通过使用MeOH 或 CH 3 CN 中的 H 2 O 2进行仲胺的无催化剂氧化,从苄基仲胺生成硝酮。该方法可以选择性地获得多种 C-芳基硝酮,产率为 60% 至 93%。已经进行了几项研究来阐明反应机理和溶剂的作用。
Dehydrogenation of
<i>N</i>
‐Heterocyclic Compounds Using H
<sub>2</sub>
O
<sub>2</sub>
and Mediated by Polar Solvents
The oxidative dehydrogenation of N-heterocyclic compounds by using H2O2 as oxidant in combination with polar solvents such as 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) and H2O is described. Among these two solvents, the best yields for the heteroaromatic compounds were generally achieved in HFIP. However, it is remarkable, that the use of a non toxic solvent such as H2O gave such good yields. Furthermore
描述了以H 2 O 2作为氧化剂并结合极性溶剂如1,1,1,3,3,3-六氟异丙醇(HFIP)和H 2 O对N-杂环化合物进行氧化脱氢。在这两种溶剂中,杂芳族化合物的最佳收率通常在 HFIP 中实现。然而,值得注意的是,使用无毒溶剂如 H 2 O 得到了如此好的收率。此外,该程序以更大规模实施,HFIP 从反应混合物中蒸馏出来并重复使用(最多 5 个循环),而不会显着损害反应结果。
Selective reduction of the N-O bond in -oxides and in nitrones by sodium hydrogen telluride