Visible-light-promoted one-pot synthesis of (3-keto sulfones from aryldiazo tetrafluoroborate salts via aerobic multicomponent reaction

(3-Keto sulfone is a useful structure in organic chemistry and pharmaceuticals. In the present study, we developed a highly efficient visible-light-promoted reaction to prepare (3-keto sulfones under mild conditions. Synthesis was achieved via one-pot multi-component reaction of aryldiazo tetrafluoroborate salts, alkenes, and DABSO in the presence of air (O2) with rhodamine B serving as the photocatalyst. A variety of (3-keto sulfones were obtained at high yields by this one-pot operation under aerobic atmosphere. This oxysulfonylation procedure has benefits such as mild reaction conditions, a wide tolerance of functional groups, and simplicity, making it a promising choice for preparing valuable (3-keto sulfones.