Metal- and photocatalyst-free synthesis of 3-selenylindoles and asymmetric diarylselenides promoted by visible light
作者:Ignacio D. Lemir、Willber D. Castro-Godoy、Adrián A. Heredia、Luciana C. Schmidt、Juan E. Argüello
DOI:10.1039/c9ra03642c
日期:——
the synthesis of 3-selenylindoles employing diorganyl diselenides and indoles or electron-rich arenes as starting materials. Visible blue light was used to promote the reaction without employing transitionmetal complexes or organic photocatalysts as sensitizers. Additives such as strong oxidants or bases were not required. Moreover, ethanol was employed as a benign solvent under mild reaction conditions
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.
GRAPHICAL ABSTRACT Abstract A simple method was developed for the synthesis of 3-chalcogen indoles via iodine-promoted direct 3-selanyl- and 3-sulfenylation of indoles with dichalcogenides. The reaction was carried out smoothly in EtOH under air at room temperature, selectively giving a series of 3-chalcogen indoles bearing different functional groups in good to excellent yields. The procedure has
A Solvent- and Metal-Free Synthesis of 3-Chacogenyl-indoles Employing DMSO/I<sub>2</sub> as an Eco-friendly Catalytic Oxidation System
作者:Juliano B. Azeredo、Marcelo Godoi、Guilherme M. Martins、Claudio C. Silveira、Antonio L. Braga
DOI:10.1021/jo5000779
日期:2014.5.2
Herein, we describe a solvent- and metal-free method for the synthesis of 3-chalcogenyl-indoles from indoles and diorganyl dichalcogenides using an equivalent amount of DMSO as an oxidant, under catalysis by molecular iodine. This mild and eco-friendly approach allowed the preparation of a wide range of 3-selenyl- and 3-sulfenyl-indoles in good to excellent yields.
Rose Bengal catalysed photo-induced selenylation of indoles, imidazoles and arenes: a metal free approach
作者:Sumbal Saba、Jamal Rafique、Marcelo S. Franco、Alex R. Schneider、Leandro Espíndola、Dagoberto O. Silva、Antonio L. Braga
DOI:10.1039/c7ob03177g
日期:——
In this report, the highly efficient Rose Bengal-catalysed C(sp2)–H selenylation of indoles, imidazoles and arenes was achieved using a half molar equiv. of diorganoyl diselenides. This metal-free, photo-induced protocol resulted in selenylated products in good to excellent yields. The reaction features are high yields, an atom-economic, gram-scalable and metal-free approach, and applicability to different