作者:Ginger Lutteke、Roel A. Kleinnijenhuis、Remmelt J. Beuving、René de Gelder、Jan M. M. Smits、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1002/ejoc.201601094
日期:2016.12
enantioselective synthesis of the right-hand substructure of solanoeclepin A has been developed. The key step was an intramolecular [2+2] photocycloaddition between an allene and a butenolide providing a methylenecyclobutane with three quaternary carbon atoms in a complex tetracyclic framework. Other crucial steps included an enantioselective Noyori transfer hydrogenation of a ketone, a diastereoselective silver-mediated
已经开发了茄碱 A 右侧亚结构的对映选择性合成。关键步骤是丙二烯和丁烯内酯之间的分子内 [2+2] 光环加成反应,在复杂的四环骨架中提供具有三个季碳原子的亚甲基环丁烷。其他关键步骤包括酮的对映选择性 Noyori 转移氢化、非对映选择性银介导的甲硅烷基二烯酸酯烯丙基化和烯丙醇的非对映选择性环丙烷化。通过减少内酯部分来安装桥头甲基被证明是麻烦的。