CuSO<sub>4</sub>·5H<sub>2</sub>O-<i>H</i>-Phosphonate-Catalyzed Intermolecular C-S Bond Formation: Synthesis of (<i>E</i>)-Vinyl Alkylsulfones from Alkynes and DMSO
A CuSO4·5H2O-H-phosphonate-catalyzedsynthesis of (E)-vinylalkylsulfonesfromalkynes and widely available DMSO was developed. The present protocol provides an alternative approach to various vinyl sulfones, with the advantages of cheap catalysts, readily available starting materials, operational simplicity and high stereo- and regioselectivity.