The same oxygenation-state introduction of hypervalent sulfur under transition-metal-free conditions

Sulfonyl compounds have attracted considerable interest due to their extensive applications in drug discovery. Access to the assembly of SO2-containing compounds via the oxygenation oxidative-state introduction of hypervalent sulfur has come to the fore in recent years. This review discusses the application of the same oxygenation-state introduction of hypervalent sulfur strategy under transition-metal-free conditions, and presents it in light of different atoms being linked to the sulfonyl group, including sulfones, sulfonamides, sulfonyl fluorides and thiosulfonates.