On the other hand, allyl ketones are another type of synthetically valuable reagents that used widely in organic synthesis. Owing to the steric effect, these deconjugated carbonyls usually serve as vinylogous nucleophiles to undergo aldol reactions or Michael additions at γ-position selectively . In addition, the terminal carbon-carbon double bond of allyl ketones can also participate in Diels-Alder cyclization to form heterocycles . During our research on SuFEx click reactions 10 , we found that allyl ketones do not undergo the anticipated γ-selective Michael addition with the active ethenesulfonyl fluoride. Interestingly, an unexpected α-selective Michael addition-SuFEx cyclization reaction performed to produce γ-alkenylated δ-sultones efficiently. Herein, we would like to report this result.