摘要:
Herein we report the first all-carbon N-heterocyclic carbene-catalyzed (4 + 2) cycloaddition. The reaction proceeds with alpha,beta-unsaturated acid fluorides and silyl dienol ethers and produces 1,3-cyclohexadienes with complete diastereocontrol (dr > 20:1) while demonstrating a new type of reaction cascade exploiting alpha,beta-unsaturated acyl azoliums.