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 4 Å molecular sieves were used as efficient HF scavenger to restrict the neutralization and deactivation of the Brønsted base catalyst.