Total Synthesis of the Originally Proposed and Revised Structures of Palmerolide A and Isomers Thereof
作者:K. C. Nicolaou、Ya-Ping Sun、Ramakrishna Guduru、Biswadip Banerji、David Y.-K. Chen
DOI:10.1021/ja710485n
日期:2008.3.1
Palmerolide A is a recently disclosed marine natural product possessing striking biological properties, including potent and selective activity against the melanoma cancer cell line UACC-62. The total syntheses of five palmerolide A stereoisomers, including the originally proposed (1) and the revised [ent-(19-epi-20-epi-1)] structures, have been accomplished. The highly convergent and flexible strategy
Palmerolide A 是最近公开的一种海洋天然产物,具有惊人的生物学特性,包括针对黑色素瘤癌细胞系 UACC-62 的有效和选择性活性。五种palmerolide A立体异构体的全合成,包括最初提出的(1)和修改后的[ent-(19-epi-20-epi-1)]结构,已经完成。为这些综合开发的高度收敛和灵活的策略涉及构建关键构建块 2、19-epi-2、20-epi-2、ent-2、3、ent-3、4 和 ent-4,以及它们的组装和细化目标化合物。对于构建单元的结合,采用了Stille偶联反应、Yamaguchi酯化、Horner-Wadsworth-Emmons烯化和闭环复分解反应,后者对于palmerolide结构的大环的立体选择性形成至关重要。还研究了 Horner-Wadsworth-Emmons 烯化和 Yamaguchi 内酯化,并发现作为构建 Palmerolide