A new metal-free sulfonylation reaction is described. The method takes advantage of the Umpolung reactivity and group-transfer properties of iodine(III) compounds, combining hypervalent iodine reagents and sulfinate salts to deliver a clean and mild transfer of sulfonyl groups to amines and anilines. A total of 25 sulfonamides was synthesised in up to 99 % yield, even on gram-scale. The reaction mechanism was investigated by ESI-MS and DFT calculations.
- Hypervalent iodine
- Synthetic methods