Application of FeCl3/Diorganyl Diselenides to Cyclization of o-Alkynyl Anilines: Synthesis of 3-Organoselenyl-(N-methyl)indoles
摘要:
In this manuscript we described the FeCl3/diorganyl diselenides promoted intramolecular cyclization of o-alkynyl anilines, as an alternative for the construction of functionalized 3-organoselenyl indoles. The cyclization reactions proceeded smoothly at room temperature in the presence of air giving the 3-organoselenyl indoles in good yields. Additionally, the 3-organoselenyl indoles proved to be quite useful as synthetic intermediates for the construction of more functionalized indole units through a selenium-lithium exchange reaction followed by trapping the lithium intermediate with different electrophiles.
Direct, Metal-free C(sp<sup>2</sup>
)−H Chalcogenation of Indoles and Imidazopyridines with Dichalcogenides Catalysed by KIO<sub>3</sub>
作者:Jamal Rafique、Sumbal Saba、Marcelo S. Franco、Luana Bettanin、Alex R. Schneider、Lais T. Silva、Antonio L. Braga
DOI:10.1002/chem.201705404
日期:2018.3.15
synthesis of 3‐Se/S‐indoles and imidazo[1,2‐a]pyridines through direct C(sp2)−H bond chalcogenation of heteroarenes with half molar equivalents of different dichalcogenides, using KIO3 as a non‐toxic, easy‐to‐handle catalyst and a stoichiometric amount of glycerol. The reaction features are high yields, based on atom economy, easy performance on gram‐scale, metal‐ and solvent‐free conditions as well as applicability
本文中,我们报告了一种更环保的协议,该方法通过杂芳烃的直接C(sp 2)-H键硫代半数当量的不同二硫代半乳糖苷合成3-Se / S-吲哚和咪唑并[1,2- a ]吡啶KIO 3是一种无毒,易于操作的催化剂和化学计量的甘油。该反应的特征是基于原子经济性的高收率,在克级,无金属和无溶剂条件下易于操作以及适用于不同类型的N-杂芳烃。
Palladium(II)/Copper(II)-Catalyzed C-H Sulfidation or Selenation of Arenes Leading to Unsymmetrical Sulfides and Selenides
C–H sulfidation or selenation of arenes by a Pd(II)/Cu(II) catalytic system: Preparation of unsymmetrical sulfides or selenides by C–H functionalization has been disclosed. This protocol could be applied a various of arenes. In the case of using an indolizine and pentafluorobenzene, bis‐sulfidated product were obtained.
Synthesis of 3-Sulfenyl- and 3-Selenylindoles by the Pd/Cu-Catalyzed Coupling of <i>N</i>,<i>N</i>-Dialkyl-2-iodoanilines and Terminal Alkynes, Followed by <i>n</i>-Bu<sub>4</sub>NI-Induced Electrophilic Cyclization
作者:Yu Chen、Chul-Hee Cho、Feng Shi、Richard C. Larock
DOI:10.1021/jo9014003
日期:2009.9.4
palladium/copper-catalyzed crossing coupling of N,N-dialkyl-ortho-iodoanilines and terminalalkynes and subsequent electrophilic cyclization of the resulting N,N-dialkyl-ortho-(1-alkynyl)anilines with arylsulfenyl chlorides or arylselenyl chlorides. The presence of a stoichiometric amount of n-Bu4NI is crucial to the success of the electrophilic cyclization. A variety of 3-sulfenyl- and 3-selenylindole derivatives
3-亚硫基-和 3-硒基吲哚可通过两步法合成,包括钯/铜催化的N , N - 二烷基-邻 -碘苯胺和末端炔烃的交叉偶联以及随后所得N , N - 的亲电环化二烷基-邻-(1-炔基)苯胺与芳基硫基氯或芳基硒基氯。存在化学计量的n -Bu 4NI 对于亲电环化的成功至关重要。各种带有烷基、乙烯基、芳基和杂芳基取代基的 3-亚苯基和 3-硒基吲哚衍生物已经以良好到极好的产率(高达 99%)制备。通过使用N,N-二苄基-邻-碘苯胺,已成功制备了3-硫基-N - H-吲哚。此外,3-磺酰基-和3-亚磺酰基吲哚也已通过相应的3-亚磺酰基吲哚的轻松氧化成功制备。
Synthesis of 3-selanylbenzo[<i>b</i>]furans promoted by SelectFluor®
A simple and practical protocol for the synthesis of 3-selanyl-benzo[b]furans mediated by the SelectFluor® reagent was developed. This novel methodology provided a greener alternative to generate 3-substituted-benzo[b]furans via a metal-free procedure under mild conditions. The intramolecular cyclization reaction was carried out employing an electrophilic selenium species generated in situ through
开发了一种简单实用的由 SelectFluor® 试剂介导的3-硒基-苯并[ b ]呋喃合成方案。这种新颖的方法提供了一种在温和条件下通过无金属程序生成 3-取代-苯并[ b ]呋喃的更环保的替代方案。分子内环化反应采用通过 SelectFluor® 和有机二硒化物之间的反应原位产生的亲电硒物质进行。通过异核核磁共振波谱证实了这种亲电硒物质(RSe-F)的形成,并探讨了其反应性。
Convenient synthesis of selenyl-indoles <i>via</i> iodide ion-catalyzed electrochemical C–H selenation
作者:Xing Zhang、Chenguang Wang、Hong Jiang、Linhao Sun
DOI:10.1039/c8cc04543g
日期:——
Reported herein is a transition metal- and oxidant-free method for the synthesis of selenyl heteroarenes with diselenides through iodide ion-catalyzed electrolytic selenation. This direct C(sp2)–H selenation strategy, with reduced environmental impact, provides efficient access to a host of selenyl indoles and some other N-heteroarenes under aerobic and galvanostatic conditions.