with a highly functionalized 8-oxabicyclo[3.2.1]octadiene system. The route features two sequential annulations to append a six- and five-membered ring onto the core structure followed by oxidative cleavage to reveal the eunicellin skeleton. Key to this strategy is a diastereo-selective intramolecular Nozaki-Hiyama-Kishi (NHK) closure to establish the correct relative stereochemical relationship at C6
在这封信中,我们描述了从高度官能化的 8-氧杂双环 [3.2.1]
辛二烯系统开始合成 C8 氧化单胞菌素二萜的第一种方法。该路线具有两个连续的环,将一个六元和五元环附加到核心结构上,然后氧化裂解以显示单胞菌素骨架。该策略的关键是非对映选择性分子内 Nozaki-Hiyama-Kishi (NHK) 闭合,以在
天然产物的 C6 和 C8 处建立正确的相对立体
化学关系。