Synthesis of γ‐Alkenylated δ‐Sultones via Brønsted Base‐Catalyzed Annulative SuFEx Reaction of Allyl Ketones and Ethenesulfonyl Fluorides

A tandem annulation reaction of allyl ketones and β‐aryl ethenesulfonyl fluorides has been described. Under the catalysis of Brønsted base, allyl ketones reacted with β‐aryl ethenesulfonyl fluorides through a tandem intermolecular Michael addition‐intramolecular SuFEx process to afford γ‐alkenylated δ‐sultones in good to excellent yields. In this reaction, no additional base was needed, and 4Å molecular sieves were used as efficient HF scavenger to restrict the neutralization and deactivation of the Brønsted base catalyst.