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.
Heck Vinylations Using Vinyl Sulfide, Vinyl Sulfoxide, Vinyl Sulfone, or Vinyl Sulfonate Derivatives and Aryl Bromides Catalyzed by a Palladium Complex Derived from a Tetraphosphine
affords an efficient catalyst for the Heck reaction ofsulfur-containing alkenes with aryl bromides. The rates and yields of the reactions strongly depend on the oxidation state of the sulfur atom. Using vinyl sulfides with 1 mol% catalyst, low to moderate yields of arylated alkenes were obtained. Phenyl vinyl sulfoxide was found to be more reactive, and satisfactory yields of (E)-[2-(phenylsulfinyl)vinyl]benzene