作者:Jeffrey D. Neighbors、John A. Beutler、David F. Wiemer
DOI:10.1021/jo048444r
日期:2005.2.1
Synthesis of nonracemic 3-deoxyschweinfurthin B has been accomplished through a synthetic sequence including a key cascade cyclization of an epoxy olefin. The intermediate epoxide could be prepared as a single enantiomer through an AD-mix-α (or AD-mix-β) oxidation, and the stereochemistry of the epoxide has been shown to control formation of the two additional stereogenic centers created through the
非外消旋3-脱氧天鹅绒素B的合成已经通过包括对环氧烯烃的关键级联环化的合成序列来完成。中间环氧化物可通过AD-mix-α(或AD-mix-β)氧化制备为单个对映体,并且环氧化物的立体化学已显示出可控制通过环化作用形成的两个另外的立体异构中心的形成。在国家癌症研究所的60细胞系抗癌试验中,发现合成的3-deoxyschweinfurthin B具有有效的差异活性。这代表了四环schweinfurthin骨架的首次合成,证实了我们的整体合成策略,并提供了第一个schweinfurthin类似物,其活性略高于天然产物。