Development of Perfluoroarene−Arene Interactions for Macrocyclic En-yne Metathesis and the Total Synthesis of Macrocyclic Natural Products
作者:Shawn K. Collins、Yassir El-Azizi、Andreea R. Schmitzer
DOI:10.1021/jo070568r
日期:2007.8.1
en-yne metathesis of strained macrocyclic systems is possible using highly active Grubbs−Hoveyda second-generation catalyst and when exploiting fluoroarene−arene gearing interactions. These interactions are effective even under high reaction temperatures and in the presence of a competitive π-rich solvent such as toluene. These results suggest that efficient π−π stacking or π−lp interactions between
使用高活性的第二代Grubbs-Hoveyda催化剂以及利用氟代芳烃与芳烃的齿轮相互作用,可以有效地实现应变大环系统的直接烯炔复分解。这些相互作用甚至在高反应温度下和在竞争性的富含π的溶剂(如甲苯)的存在下也是有效的。这些结果表明,含有五氟苯基和3,5-双(三氟甲基)苯基的助剂之间有效的π-π堆积或π-lp相互作用是造成大环化产物产率高的原因。3,5-双(三氟甲基)苄基齿轮元件可提供更高的收率和更大的E在大环烯炔复分解中的选择性形成模型对环烷,可用于制备天然产物longithorone系列成员。