Directing the Stereoselectivity of the Claisen Rearrangement to Form Cyclic Ketones with Full Substitution at the α-Positions.
Fatimat O BadmusRaju S ThombalSatish Chandra PhilkhanaJoshua A MaloneChristian E BaileyEstefania Armendariz-GonzalezEdward W MurekaCale M LociceroFrank R FronczekRendy KartikaPublished in: Organic letters (2023)
We report an enantioselective synthesis of cyclic ketones with full substitutions at the α-positions in a highly diastereoselective manner. Our method is achieved by subjecting substrate motifs in 2-allyloxyenones to chiral organomagnesium reagents, which trigger the Claisen rearrangement upon direct 1,2-carbonyl addition. The observed diastereoselectivity of the allyl migration is proposed to originate from the intramolecular chelation of the magnesium alkoxide to the allyloxy moiety.