Direct iodosulfonylation of internal alkynes with sulfonyl iodides, photoinitiated by violet LED light, proceeds under mild conditions, transition metals and photocatalyst free. Reaction has good functional group tolerance and high product yields.
C3-Sulfonate esters and C4-chlorides of quinolines were obtained in chemo- and regio-selective manners under metal-free conditions.
Photocatalytic iodosulfonylation in ethanol allows the isolation of β-iodovinyl aryl and alkyl sulfones after dilution of the reaction mixture with water and filtration.
An efficient nickel-catalysed dehydrosulfonylation of unactivated allyl alcohols with sulfonyl hydrazides has been successfully developed for the synthesis of various allyl sulfones without additional acidic active agents under mild conditions.
Electrochemical synthesis of sulfinic and sulfonic esters from sulfonyl hydrazides yields insights into radical-mediated pathways, optimizing ester production.