Total Synthesis of (−)-Galbonolide B and the Determination of Its Absolute Stereochemistry
作者:Bruno Tse
DOI:10.1021/ja961344l
日期:1996.1.1
Since the relative stereochemistry of galbonolide B had been determined from the X-ray structure, the absolute stereochemistry of galbonolide B was therefore formally established to be structure 1, which contradicted earlier speculations in the literature. A total synthesis of galbonolide B has been completed. A highly selective method was developed for the assembly of the peculiar diene unit using Martin's
通过反式内酯化反应,galbonolide B (1) 转化为 3,C13 处的手性仲醇暴露用于衍生化。采用两种独立的方法来确定 C13 处的绝对手性。这两种方法都在 C13 处建立了 S 手性。由于 galbonolide B 的相对立体化学已经从 X 射线结构确定,因此 galbonolide B 的绝对立体化学被正式确定为结构 1,这与文献中早期的推测相矛盾。galbonolide B的全合成已经完成。开发了一种用于组装特殊二烯单元的高选择性方法,使用 Martin 的硫烷试剂对前面的叔醇 20 进行脱水。C4 处的手性中心是通过“逆空间”烯醇化学安装的。采用一种新的宏迪克曼环化来生成大环。C2 处所需的构型是从相应烯...