A General Route to Cyclopeptide Alkaloids: Total Syntheses and Biological Evaluation of Paliurines E and F, Ziziphines N and Q, Abyssenine A, Mucronine E, and Analogues
A full account of the total syntheses of the cyclopeptidealkaloids paliurine E and F, ziziphine N and Q, abyssenine A, and mucronine E is provided. A key feature of the syntheses involves an intramolecular amidation of a vinyl iodide, which allows us simultaneously to address two synthetic challenges associated with cyclopeptidealkaloids: the formation of the enamide and macrocyclization. We also
提供了环肽生物碱 paliurine E 和 F、ziziphine N 和 Q、abyssenine A 和 mucronine E 的全合成的完整说明。合成的一个关键特征涉及乙烯基碘的分子内酰胺化,这使我们能够同时解决与环肽生物碱相关的两个合成挑战:烯酰胺的形成和大环化。我们还记录了其他策略在大环化步骤中的使用,以及对获得的天然产物和类似物的抗菌和细胞毒性特性的评估。
Total Synthesis of the Cyclopeptide Alkaloid Paliurine E. Insights into Macrocyclization by Ene−Enamide RCM
作者:Mathieu Toumi、François Couty、Gwilherm Evano
DOI:10.1021/jo702092x
日期:2008.2.1
The totalsynthesis of (−)-paliurine E is described in 14 steps and 11% overall yield. The first successful application of ene−enamide ring-closingmetathesis for macrocyclization serves as the foundation for this synthesis and allowed for a straightforward installation of the challenging cyclic enamide together with the macrocycle. In the course of these synthetic studies, we also found that very