Radical induced cyclisations of unsaturated allylic sulfones containing an activating electron withdrawing group

Abstract

Radical induced cyclisations of some unsaturated allylic sulfones containing an electron withdrawing amide group β-to the sulfone group are described. Products containing five-, six- and seven-membered rings have been obtained using appropriate precursors. In the case of the six-membered ring, examples of all four possible modes of cyclisation were found: i.e. exo-6-exo, exo-6-endo, endo-6-exo and endo-6-endo.