Design of a New SO2-Surrogate and Its Applications in Palladium-Catalyzed Direct Aminosulfonylations between Aryl Iodides and Amines

A new SO 2 -surrogate is reported which is cheap, bench-stable, and can be accessed in just two steps from bulk chemicals. Essentially complete SO 2 -release is achieved in 5 minutes. Eight established sulfonylation reactions proceeded smoothly by ex-situ formation of SO 2 utilizing a two-chamber system in combination with the SO 2 -surrogate. Furthermore, we report the first direct aminosulfonylation between aryl iodides and amines. Broad functional group tolerance is demonstrated, and the method is applicable to pharmaceutically relevant substrates, including heterocyclic substrates.