Cascade Olefin Isomerization/Intramolecular Diels-Alder Reaction Catalyzed by N-Heterocyclic Carbenes
作者:Marcin Kowalczyk、David W. Lupton
DOI:10.1002/anie.201402067
日期:2014.5.19
The addition of an N‐heterocycliccarbene to the carbonyl group of an α,β,γ,δ‐unsaturated enol ester affords a hemiacetal azoliumintermediate that enables a cascade olefin isomerization/Diels–Alder reaction, for which mechanistic studies implicate Lewis base catalysis. Preliminary studies into the utility of the products have been undertaken with reductive and oxidative cleavage, giving materials