Catalyst-Controlled Direct Oxysulfonylation of Alkenes by Using Sulfonylazides as the Sulfonyl Radical.

A copper/cobalt-catalyzed difunctionalization of alkenes with sulfonylazides and tert-butyl hydroperoxide has been achieved. This protocol provides an efficient and direct oxysulfonylation approach to ß-ketosulfones and ß-sulfonyl peroxides in moderate to good yields under mild conditions. This methodology applies sulfonylazides as a new sulfonyl radical source and features a wide substrate scope and good functional group tolerance.