Asymmetric Inverse-Electron-Demand Hetero-Diels-Alder Reaction of Six-membered Cyclic Ketones: An Enamine/Metal Lewis Acid Bifunctional Approach
作者:Zhenghu Xu、Lu Liu、Kraig Wheeler、Hong Wang
DOI:10.1002/anie.201100160
日期:2011.4.4
On demand: The first example of the title reaction involving cyclic ketones and β,γ‐unsaturated α‐ketoesters has been achieved using the novel enamine/metal Lewisacid bifunctional catalysis (see scheme; Tf=trifluoromethanesulfonyl). Enones with both electron‐withdrawing and electron‐donating groups at the γ position reacted smoothly with cyclohexanone affording the products in excellent chemo‐ and