Synthesis of Sultones from Chlorosulfates by a Complex Cascade Reaction Occurring under Mild Thermal Conditions

Generation of alkoxysulfonyl radicals from chlorosulfates and their intramolecular capture with alkynes to obtain sultones

An unprecedented radical-mediated reaction of alkyne-containing chlorosulfates to synthesize sultones has been established. The reaction leads to the formation and subsequent capture of alkoxysulfonyl radicals, which are species known for a long time but not studied for synthetic purposes.

Synthesis of Spirocyclic Compounds by a Ring-Expansion/Cationic Cyclization Cascade Reaction of Chlorosulfate Derivatives

A novel cascade reaction to prepare spirocarbocyclic compounds from chlorosulfate derivatives has been developed. The process involves an unusual thermal elimination of the chlorosulfate moiety, a ring-expansion reaction, and a subsequent cationic cyclization reaction. Despite the relatively complex skeletal rearrangement, the reaction described here is featured by its operational simplicity, being just a thermal process that does not require additional reagents, catalysts, or additives.