Evolution of a Polyene Cyclization Cascade for the Total Synthesis of (−)-Cyclosmenospongine
作者:Klaus Speck、Thomas Magauer
DOI:10.1002/chem.201605029
日期:2017.1.23
We report a full account on the development of a unique cationic polyene cyclization for the total synthesis of the tetracyclic meroterpenoid (−)‐cyclosmenospongine. A highly convergent three‐component coupling strategy enabled rapid access to individual cyclization precursors that were tested for their reactivity. The successful transformation generates three rings and sets four consecutive stereocenters
我们报告了一个完整的发展为四环甲氧萜(-)-cyclosmenospongine的全合成独特的阳离子多烯环化的完整说明。高度收敛的三组分偶联策略使得能够快速访问经过测试其反应性的各个环化前体。成功的转换生成了三个环,并在一次操作中以高效的方式设置了四个连续的立体中心,从而仅给出了十萘烷的反式构架。此外,我们发现烯醇醚的几何形状以及C3和C8的相对构型对于多烯环化的成功至关重要。