Total Synthesis and Structural Revision of Vannusals A and B: Synthesis of the True Structures of Vannusals A and B
作者:K. C. Nicolaou、Adrian Ortiz、Hongjun Zhang、Graziano Guella
DOI:10.1021/ja100742b
日期:2010.5.26
Having determined through totalsynthesis that the originally assigned structure of vannusals A and B were incorrect, we set out to uncover the identity of the true structures of these novel marine natural products. Our search was based on intelligence gathered by NMR spectroscopy and chemical synthesis and took us through the totalsynthesis of eight diastereomeric vannusal B structures [2, d-2, 3, d-3
通过全合成确定 vannusals A 和 B 最初指定的结构是不正确的,我们着手揭示这些新型海洋天然产物的真实结构的身份。我们的搜索基于核磁共振光谱和化学合成收集的情报,并带领我们完成了八个非对映异构体 B 结构的全合成 [2、d-2、3、d-3、4、d-4、5 和 d- 5、图2]。vannusals A 和 B 的真实结构最终分别确定为 d-5 和 d-1。他们的全合成基于高度收敛和高效的策略,涉及乙烯基碘 (-)-6 和醛 (+/-)-94 的片段,并具有立体选择性锂介导的偶联反应和钐诱导的环化过程。碳骨架的最后一个环。