Photocatalytic synthesis of sulfonamidylated chroman-4-ones: metal- and oxidant-free radical addition-cyclization.
A metal- and oxidant-free photocatalytic cascade reaction has been developed for the divergent synthesis of sulfonamidylated chroman-4-ones. This visible-light-driven protocol employs readily available o-(allyloxy)arylaldehydes and N-sulfonylaminopyridinium salts as feedstocks. A sulfonamidyl radical-triggered addition...