A practical protocol to synthesize 3-substituent-2-(azol-1-yl)indolederivatives has been developed via an electrochemical oxidative cross coupling process under mild conditions. This electro-oxidative C–N bond formation strategy tolerates a range of functional groups and is amenable to gram scale synthesis. Moreover, this method was applied to the late-stage functionalization of bioactive molecules
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。
Palladium-catalyzed C-H formylation of electron-rich heteroarenes through radical dichloromethylation
作者:Yan Bao、Jian-Yong Wang、Ya-Xuan Zhang、Yan Li、Xi-Sheng Wang
DOI:10.1016/j.tetlet.2018.07.013
日期:2018.8
A novel palladium-catalyzed C-H formylation of electron-rich N-, O-, and S-containing heteroarenes has been developed. The key to success is that the commercially available BrCHCl2 was used as a stoichiometric carbonyl source. Mechanistic investigations indicated that different from the known Reimer-Tiemann reaction, this net C-H formylation proceeded through an electrophilc radical-type path.
Copper-Catalyzed Direct Synthesis of 3-Arylindoles
作者:Siva Murru、August A. Gallo、Radhey S. Srivastava
DOI:10.1002/ejoc.201001745
日期:2011.4
A direct method for the preparation of various 3-arylindoles from their corresponding nitrosoarenes has been developed. Various substituted nitrosoarenes and alkynes were employed to obtain substituted indoles by using a CuII–Cu0 catalytic system. This is a two-step method that involves annulation of the nitrosoarene and alkyne followed by deoxygenation to give 3-arylindoles.