Total Syntheses of (−)-Herbertenediol, (−)-Mastigophorene A, and (−)-Mastigophorene B. Combined Utility of Chiral Bicyclic Lactams and Chiral Aryl Oxazolines
作者:Andrew P. Degnan、A. I. Meyers
DOI:10.1021/ja984182x
日期:1999.3.1
A nonracemic bicyclic lactam has been used to construct a chiral cyclopentane containing vicinal quaternary carbon centers in optically pure form, which is common to all of the title compounds. An oxazoline-mediated asymmetric Ullmann coupling was then utilized to establish chirality about the biaryl axis of mastigophorenes A and B. Through the course of this synthesis, it was clearly demonstrated
非外消旋双环内酰胺已被用于构建含有光学纯形式的邻位季碳中心的手性环戊烷,这对所有标题化合物都是通用的。然后利用恶唑啉介导的不对称 Ullmann 偶联建立关于鞭毛虫 A 和 B 联芳轴的手性。通过该合成过程,清楚地证明较小的手性助剂导致更高水平的 atroposelection,这是以前未知的现象非对称乌尔曼耦合。