Pestalotiopsin A. Side Chain Installation and Exhaustive Probing of Olefin Metathesis as a Possible Tool for Elaborating the Cyclononene Ring
作者:Leo A. Paquette、Shuzhi Dong、Gregory D. Parker
DOI:10.1021/jo070862j
日期:2007.9.1
terminal double bonds in anticipation of the fact that the (E)-cyclononene substructure could be realized by ring-closing metathesis. This central issue was evaluated with several diene substrates and catalysts, all to no avail. Cross-metathesis experiments involving 59 and 65 with the functionalized heptene 60 revealed a marked difference in the inability to engage interaction with the ruthenium catalyst
描述了一种针对不对称合成的鼠疫视蛋白A的程序。该路线以右旋环丁醇37开始,该环丁醇与对映体定义的结构单元ent - 15和16结合在一起。这些单元分别通过立体控制的1,2-亲核加成和抗醛醇偶合结合。完成这些简单的反应后,由于预期可以通过闭环复分解实现(E)-环壬烯亚结构这一事实,因此在续集中引入了末端双键。用几种二烯底物和催化剂评估了这个中心问题,但都无济于事。跨复分解实验,涉及59个和具有官能化庚烯60的化合物65和65表明不能与钌催化剂进行相互作用的显着差异。这种尴尬无法避免。