Polystyrene resin-supported CuI-cryptand 22 complex: a highly efficient and reusable catalyst for the formation of aryl–sulfur bonds in aqueous media
作者:Nasrin Rezaei、Barahman Movassagh
DOI:10.1016/j.tetlet.2016.03.005
日期:2016.4
The air and moisture stable polystyrene resin-supported copper(I) iodide-cryptand-22 complex (PS-C22-CuI) behaves as an efficient and robust heterogeneouscatalyst in the cross-coupling reaction of aryl halides and thiols in aqueous media. Moreover, the heterogeneouscatalyst can be easily recovered by filtration and reused for five cycles without significant loss in activity.
GRAPHICAL ABSTRACT ABSTRACT A catalyst free and chemoselective oxidation of sulfides to sulfoxides or sulfones was developed using 1,1,2,2-tetrahydroperoxy-1,2-diphenylethane as a new oxidant. This scope has shown the achievement of various sulfoxides and sulfones which were obtained selectively in high yields at room temperature.
Metal-Free Preparation of Cycloalkyl Aryl Sulfides<i>via</i>Di-<i>tert</i>-butyl Peroxide-Promoted Oxidative C(<i>sp</i><sup>3</sup>)H Bond Thiolation of Cycloalkanes
作者:Jincan Zhao、Hong Fang、Jianlin Han、Yi Pan、Guigen Li
DOI:10.1002/adsc.201400032
日期:2014.8.11
A concise thiolation of C(sp3)-Hbond of cycloalkanes with diaryl disulfides in the presence of oxidant of di-tert-butylperoxide (DTBP) has been developed. This reaction without using any of metal catalyst, tolerates varieties of disulfides and cycloalkanes substrates, giving good to excellent chemical yields, which provides a useful approach to cycloalkyl aryl sulfides from unactivated cycloalkanes
A new polymer-anchored Cu(II) complex has been synthesized and characterized. The catalytic performance of the complex has been tested for the oxidation of sulfides and in oxidative bromination reaction with hydrogen peroxide as the oxidant. Sulfides have been selectively oxidized to the corresponding sulfoxides in excellent yields and in the presence of KBr as the bromine source, organic substrates
An efficient ligand-free C−S cross-coupling of aryl halides with aromatic/alkyl thiols has been developed using a catalytic amount of nanocrystalline indium oxide as a recyclable catalyst with KOH as the base in DMSO at 135 °C. A variety of aryl sulfides can be synthesized in excellent yields utilizing this protocol.