Total Syntheses of (±)-Fawcettimine, (±)-Fawcettidine, (±)-Lycoflexine, and (±)-Lycoposerramine-Q
作者:Naoya Itoh、Takashi Iwata、Hiromi Sugihara、Fuyuhiko Inagaki、Chisato Mukai
DOI:10.1002/chem.201300364
日期:2013.6.24
The total syntheses of four fawcettimine‐related Lycopodium alkaloids, (±)‐fawcettimine, (±)‐fawcettidine, (±)‐lycoposerramine‐Q, and (±)‐lycoflexine, were completed in a highly stereoselective manner. The Pauson–Khand reaction of 4‐methylidene‐6‐siloxyoct‐1‐en‐7‐yne followed by regio‐ and stereoselective hydrogenation led to the short‐step preparation of the bicyclo[4.3.0]nonenone intermediate bearing
四个fawcettimine相关的全合成石松生物碱,(±)-fawcettimine,(±)-fawcettidine,(±)-lycoposerramine-Q,和(±)-lycoflexine,是在一个高度立体选择性的方式完成。4-亚甲基-6-甲硅烷氧基辛-1-烯-7-炔的Pauson-Khand反应,然后进行区域和立体选择性氢化,导致了带有甲基的双环[4.3.0]壬烯酮中间体的短程制备所需的立体化学。随后对双环化合物进行化学处理,得到了6-5-9元三环二氧杂环己烷化合物,然后以另一种更有效的方式转化为四种目标生物碱。