Acid mediated coupling of aliphatic amines and nitrosoarenes to indoles
作者:Subhra Kanti Roy、Anisha Purkait、Sk Md Tarik Aziz、Chandan K. Jana
DOI:10.1039/c9cc09616g
日期:——
or azo compounds. Herein, we report an acid mediated annulation reaction of aliphatic amines and nitrosoarenes to provide indole derivatives. The elusive directannulation of aliphatic amines and nitrosoarenes via simultaneous C-C and C-N bond formation was achieved under metal free conditions. This conceptually novel method for indolesynthesis does not require pre-functionalization steps for the
Direct synthesis of 3-arylindoles via annulation of aryl hydroxylamines with alkynes
作者:Angus A. Lamar、Kenneth M. Nicholas
DOI:10.1016/j.tet.2009.03.004
日期:2009.5
3-Arylindoles are produced in moderate to excellent yields from the reaction between aryl hydroxylamines and alkynes catalyzed by 10 mol % iron(II) phthalocyanine [Fe(Pc)]. Terminal and internal alkynes afford 3-aryl substituted indoles exclusively. Electron-donating and -withdrawing groups are tolerated on the aryl hydroxylamine. A few bioactive indoles are synthesized as well as several new indoles
A mild and practical protocol for selectively time-dependent dehydrogenative C-C coupling, as well as tandem coupling-cyclization reaction between indoles or/and other heteroaromatics via electrochemically oxidative process has been demonstrated. The reaction runs under noble catalyst, external oxidant and inert gas free condition, allowing tunable access to a wide variety of synthetically useful symmetrical
已经证明了一种温和实用的选择性时间依赖性脱氢 CC 偶联,以及吲哚或/和其他杂芳烃之间通过电化学氧化过程的串联偶联环化反应的方案。该反应在惰性催化剂、外部氧化剂和无惰性气体条件下进行,可调谐获得各种具有聚集诱导发射 (AIE) 的合成有用的对称或非对称杂芳烃,以及具有聚集引起猝灭的多环 3-D 吲哚衍生物(ACQ) 荧光特性。最后,初步的机理研究表明,在不同的电解电位下,通过调节N-保护基团是实现吲哚与其他杂芳烃交叉偶联的关键。
Iron-catalyzed reductive cyclization of nitroarenes: Synthesis of aza-heterocycles and DFT calculations
strategies for hydrogentransferreduction is increasing, along with the need for more elaborate heterocyclic platforms. Within this context, we develop a new approach for substituted dihydrobenzo[c]carbazoles and indoles. These compounds were synthesized through an iron-catalyzed hydrogentransferreduction of nitroarenes, followed by intramolecular cyclization. This transformation involves using a Knölker-type
随着对更精细的杂环平台的需求,对环境友好的氢转移还原策略的研究正在增加。在此背景下,我们开发了一种用于取代二氢苯并 [ c ] 咔唑和吲哚的新方法。这些化合物是通过铁催化的硝基芳烃氢转移还原,然后进行分子内环化合成的。这种转化涉及使用 Knölker 型催化剂,Cs 2 CO 3作为碱,苯甲醇作为不昂贵且低挥发性的氢供体。通过应用该策略,我们合成了 30 个氮杂杂环化合物的例子,收率中等至极佳。此外,DFT 计算表明通路反应可以遵循阴离子机制。