conformation for bioactivity while reducing the number of synthetic manipulations necessary for their synthesis. Analogues 3, 4 and 5 were prepared via total synthesis, and their conformational preferences were determined through computational and high-field NMR studies. While no observable activities were present in dactylolide analogues 3 and 4, zampanolide analogue 5 exhibited sub-micromolar cytotoxicity
Zampanolide 和 dactylolide 是微管稳定聚酮化合物,对多种癌
细胞系具有有效的细胞毒性。根据我们对两种
天然产物中大环内酯核心构象偏好的理解,我们假设缺乏 C17-甲基的类似物将保持
生物活性所需的构象,同时减少其合成所需的合成操作数量。类似物3、4和5是通过全合成制备的,并且它们的构象偏好通过计算和高场NMR研究确定。虽然在dactylolide类似物3和4中不存在可观察到的活性,但zampanolide类似物5表现出亚微摩尔细胞毒性。在此,我们描述了这些为了解dactylolide和zampanolide的结构和构象活性关系所做的努力。