The stereospecific hydrogenolysis of vinylic sulfones by sodium dithionite in a protic medium proceeds by addition of HSO2 to give an intermediate which could be isolated after alkylation in situ to a 1,2-bissulfone. The mechanism is therefore of the β-addition-elimination type. In the case of E-2-benzenesulfonyl-2-butene and ethyl iodide a single crystalline diastereoisomer was obtained and shown
Couplage mixte entre sulfones vinyliques et réactifs de grignard en présence de sels de métal de transition: synthèse stéréosélective d'oléfines trisubstituées.
作者:Jean-Luc Fabre、Marc Julia、Jean-Noël Verpeaux
DOI:10.1016/s0040-4039(00)87370-0
日期:1982.1
A new cross coupling reaction of vinylic sulphones with Grignard reagents catalyzed by nickel and iron complexes is described. This reaction is stereospecific: tri-substituted olefins of defined stereochemistry are obtained in good yield.