Metal and solvent free selective oxidation of sulfides to sulfone using bifunctional ionic liquid [pmim]IO4
作者:Sabir Ahammed、Debasish Kundu、Mohammad Nahid Siddiqui、Brindaban C. Ranu
DOI:10.1016/j.tetlet.2014.11.089
日期:2015.1
The oxidation of organo-sulfides to sulfones has been accomplished using an easily accessible bifunctional ionic liquid, [pmim]IO4 in the absence of any other oxidants, metal and organic solvent at ambient temperature. A variety of sulfides including dialkyl, aryl–alkyl, diaryl, and aryl–hetero aryl have been oxidized to the corresponding functionalized sulfones in high yields by this procedure.
Magnetically Separable CuFe<sub>2</sub>O<sub>4</sub>Nanoparticles Catalyzed Ligand-Free CS Coupling in Water: Access to (<i>E</i>)- and (<i>Z</i>)-Styrenyl-, Heteroaryl and Sterically Hindered Aryl Sulfides
作者:Debasish Kundu、Tanmay Chatterjee、Brindaban C. Ranu
DOI:10.1002/adsc.201300261
日期:2013.8.12
AbstractAn efficient coupling of styrenyl, heteroaryl and sterically hindered aryl halides with aryl‐ and heteroarylthiols catalyzed by the bimetallic Cu and Fe nanomaterial, CuFe2O4, in water in the presence of tetrabutylammonium bromide and potassium phosphate (K3PO4) has been achieved without using any ligand. A series of unsymmetrical functionalized (E)‐ and (Z)‐styrenyl aryl, heteroaryl heteroaryl and sterically hindered aryl aryl sulfides has been obtained by this procedure. The compounds are obtained in high yields and excellent stereoselectivity has been observed for styrenyl sulfides. The catalyst can be easily separated by an external magnet and recycled for ten times without any appreciable loss of activity. This procedure provides an easy access to useful and challenging biologically active organosulfides which are difficult to achieve by other methods.magnified image