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
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
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.
Fe(III)-Catalyzed direct C3 chalcogenylation of indole: The effect of iodide ions
作者:Eduardo Q. Luz、Diego Seckler、Janylson Souza Araújo、Leonardo Angst、David B. Lima、Elise Ane Maluf Rios、Ronny R. Ribeiro、Daniel S. Rampon
DOI:10.1016/j.tet.2019.01.037
日期:2019.3
iron (III)-catalyzed C3 chalcogenylation of indoles has been developed and the role of the iodide ions in this transformation was investigated. EPR experiments revealed the reduction of Fe(III) to Fe(II) under the reaction conditions, supporting the formation of molecular iodine in the system, which in effect catalyze the reaction. The scope of the chalcogenylation was broad and the synthesis of more
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