Here, we describe a general stereoselective synthesis of the marine furanosesquiterpenes structurally related to pallescensins 1-2. The stereoisomeric forms of the pallescensin 1, pallescensin 2, and dihydropallescensin 2 were obtained in high chemical and isomeric purity, whereas isomicrocionin-3 was synthesized for the first time. The sesquiterpene framework was built up by means of the coupling
在这里,我们描述了与pallescensin 1-2结构相关的海洋
呋喃型
倍半萜的一般立体选择性合成。以高
化学和异构体纯度获得了pallescensin 1,pallescensin 2和dihydropallescensin 2的立体异构体形式,而isomicrocionin-3则是首次合成。
倍半萜骨架是通过C 10环
香叶基部分与C 5 3-(亚
甲基)
呋喃部分的偶联而建立的。我们合成方法的关键步骤是立体选择合成四种环
香叶醇异构体,将其转化为相应的环
香叶基磺酰基
苯衍
生物,将其与3-(
氯甲基)
呋喃进行烷基化以及最后对
苯磺酰基官能团进行还原性裂解以提供整个
倍半萜烯骨架。