Synthetic Studies on Cyathins: Enantioselective Total Synthesis of (+)-Allocyathin B<sub>2</sub>
作者:Masashi Takano、Akinori Umino、Masahisa Nakada
DOI:10.1021/ol048010i
日期:2004.12.1
[reaction: see text] The enantioselective total synthesis of (+)-allocyathin B(2) has been achieved. Our approach features a convergent enantioselective construction of the 5-6-7 tricyclic core system using the originally developed chiral building blocks via asymmetric catalysis, the intramolecular aldol reaction in high yield, successful samarium diiodide-mediated ring expansion, and a newly developed
[反应:见正文]已实现(+)-allocyathin B(2)的对映选择性全合成。我们的方法采用5-6-7三环核心体系的对映体选择性聚合结构,该体系使用最初开发的手性结构单元通过不对称催化,分子内醛醇高产率反应,成功的二碘化sa介导的环扩环以及新开发的双环结构。绑定安装方法。