Enantioenriched methylenecyclopentanes are synthesized by stereospecific, nickel-catalyzed Heck cyclizations of secondary benzylic ethers. The reaction proceeds in high yield and enantiospecificity for benzylic ethers of both π-extended and simple arenes. Ethers with pendant 1,2-disubstituted olefins form trisubstituted olefins with control of both absolute configuration and alkene geometry. Diastereoselective
对映体富集的
亚甲基环戊烷是通过二级苄基醚的立体有择、
镍催化的 Heck 环化反应合成的。对于 π 扩展和简单
芳烃的
苄醚,该反应以高产率和对映特异性进行。带有侧链 1,2-二取代烯烃的醚形成三取代烯烃,同时控制绝对构型和烯烃几何形状。证明了多环
呋喃的非对映选择性合成。