Total Synthesis of the Cyclic Depsipeptide Vioprolide D via its (
<i>Z</i>
)‐Diastereoisomer
作者:Hanusch A. Grab、Volker C. Kirsch、Stephan A. Sieber、Thorsten Bach
DOI:10.1002/anie.202002328
日期:2020.7.20
the northern fragment was possible via its (Z )‐diastereoisomer. After macrolactamization and formation of the thiazoline ring, the (Z )‐double bond of the dehydrobutyrine unit was isomerized to the (E )‐double bond of the natural product. The cytotoxicity of vioprolide D is significantly higher than that of its (Z )‐diastereoisomer.
首次全合成 vioprolide D,从 ( 2S )-3-苄氧基-2-羟基丙酸甲酯(最长线性序列中的 16 个步骤)开始,总产率为 2.0%。环缩酚肽是由两个大小和复杂性相似的构建块以模块化、高度收敛的方法组装而成的。北部片段的 C 末端脱氢丁氨酸氨基酸上的肽键形成可能是通过其 ( Z )-非对映异构体实现的。大环内酰胺化并形成噻唑啉环后,脱氢丁酸单元的( Z )-双键异构化为天然产物的( E )-双键。 vioprolide D 的细胞毒性显着高于其 ( Z )-非对映异构体。