201

2,2,5-三取代1,3-环己二酮氢化去对称化构建多取代手性环己烷骨架

发布时间:2020-03-26  栏目类别:科研进展

The construction of chiral multiple-substituted cyclohexanes motifs is a challenging topic in organic synthesis. By the combination of desymmetrization and remote stereocontrol, a ruthenium-catalyzed transfer hydrogenative desymmetrization of 2,2,5-trisubstituted 1,3-cyclohexanediones has been successfully developed for the construction of chiral multiple-substituted cyclohexanes with high enantioselectivity and diastereoselectivity. When an ester group was introduced to the two-position, a hydrogenative desymmetrization/transesterification cascade occurred, affording the bicyclic lactones bearing three stereocenters, including two discrete stereocenters and one quaternary stereogenic center, with high enantioselectivity. The products are the multiple-substituted chiral cyclohexanes bearing the hydroxyl and carbonyl functional groups, which provide a new opportunity for further precise elaboration.


 

上一条:钯-芳环静电相互作用导向的非对映选择性翻转

下一条:通过芳基到烯基的1,4-钯迁移策略高区域选择性地实现烯烃的C-H键烷基化反应

关闭