Asymmetric Total Synthesis of Eburnamine and Eucophylline: A Biomimetic Attempt for the Total Synthesis of Leucophyllidine
作者:Ganesh Pandey、Akash Mishra、Jagadish Khamrai
DOI:10.1021/acs.orglett.7b01410
日期:2017.6.16
The first enantiospecific total synthesis of (+)-6 has been achieved employing a Friedländer quinoline synthesis as a key step. Asymmetric synthesis of the architecturally complex eburnamine 5 has also been accomplished utilizing an intramolecular acid-mediated cyclization of a carbinol amine lactone moiety. Highlights of the effective modular synthetic strategy include development of the common precursor
通过使用弗里德兰德喹啉合成作为关键步骤,实现了(+)- 6的第一个对映体全合成。利用分子内酸介导的甲醇胺内酯部分的环化也已经完成了结构上复杂的伯胺5的不对称合成。有效的模块化合成策略的重点包括开发通用前驱体4,以利用Johnson-Claisen重排策略构建具有全碳四元立体中心的特权支架5和6。尝试通过5和(+)- 6的仿生偶联合成1; 然而,形成了区域异构体26。