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。
Transition-Metal-Free HFIP-Mediated Organo Chalcogenylation of Arenes/Indoles with Thio-/Selenocyanates
作者:Pratibha Kalaramna、Avijit Goswami
DOI:10.1021/acs.joc.1c00478
日期:2021.7.16
developed a protocol for the synthesis of diaryl thio-/selenoethers by the reaction of aryl chalcogenocyanates with electron rich arenes/hetero arenes via HFIP promoted C–H activation. The reaction produces chalcogenides in good to excellent yields undermildconditions without the need of a transition metal as a catalyst. The HFIP-mediated reactions tolerated a wide range of functional groups and set the stage
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.
heteroarylselenation of indoles employing selenium powder has been developed. The advantages of this chemistry involve the use of cheap selenating reagents, tolerance of a variety of functional groups, and practicality. In addition, this protocol has been further elaborated in an intramolecular phenylselenation of a (hetero) aryl C–H bond to construct an important motif of benzoselenopheno[3,2-b]indole. A preliminary