Metal-free sulfonylative annulations of alkyl diiodides with sulfur dioxide: synthesis of cyclic aliphatic sulfones

Abstract

A straightforward protocol for cyclic aliphatic sulfones is effectively established via sulfonylative annulations of alkyl diiodides and gaseous sulfur dioxide. In this transformation, SOgen serves as a safe, bench-stable and convenient SO₂-surrogate. Five- to nine-membered cyclic aliphatic sulfones were smoothly afforded in an efficient manner. This protocol features moderate to high yields, good functional group compatibility and mild reaction conditions.