Total Synthesis of (−)-Brevenal: A Streamlined Strategy for Practical Synthesis of Polycyclic Ethers
作者:Makoto Ebine、Haruhiko Fuwa、Makoto Sasaki
DOI:10.1002/chem.201101437
日期:2011.12.2
We describe a streamlined strategy for the practical synthesis of trans‐fused polycyclic ethers and its application to a concise total synthesis of (−)‐brevenal, a new pentacyclic polyether natural product with intriguing biological activities. The B‐, D‐, and E‐rings were constructed by TEMPO/PhI(OAc)2‐mediated oxidative lactonization of the corresponding 1,6‐diols, with minimal need for manipulation
我们描述了一种用于合成反式稠合多环醚的简化策略,并将其应用于简明的全合成(-)-brevenal的合成中,这是一种具有令人感兴趣的生物活性的新的五环聚醚天然产物。B环,D环和E环是由TEMPO / PhI(OAc)2构造的介导的相应的1,6-二醇的氧化内酯化,对氧官能度的控制需求最少。B和E环内酯通过内酯衍生的烯醇磷酸的Suzuki-Miyaura偶联和随后的立体选择性硼氢化反应进行了适当的功能化。A环是通过我们的混合硫缩醛化方法形成的。AB环和DE环碎片是通过Suzuki-Miyaura联轴器组装而成的,C环的锻造方式与A环的锻造方式相同。通过本研究开发的合成途径合成了超过两克(-)-brevenal的五环聚醚核。