作者:Ryoma Hara、Takashi Furukawa、Hajime Kashima、Hiroyuki Kusama、Yoshiaki Horiguchi、Isao Kuwajima
DOI:10.1021/ja984250f
日期:1999.4.1
Introduction of C19 methyl via reductive cleavage of the cyclopropane ring under Birch conditions and successive in situ treatment of the resulting enol with methanol gave the C3α-protonated ketone 24. Next, 24 was converted to the allylsilane 29, which was then oxidized with m-CPBA to produce the fully functionalized taxusin carbon skeleton. Finally, removal of the silyl protecting groups followed by
对于 (+)-taxusin 的全合成,AC-环片段 8 由旋光 2-bromo-3-siloxycyclohexenecarbacetal 5 通过 4 个步骤制备,并转化为二烯醇甲硅烷基醚 13。由此获得的 13 经历了在 Me2AlOTf 存在下 B 环环化产生具有 C9α、C10β 取代基的 ABC 内三碳环 14,其被转化为环丙基酮 21a。在 Birch 条件下通过环丙烷环的还原裂解引入 C19 甲基,并用甲醇连续原位处理所得烯醇,得到 C3α-质子化酮 24。接下来,24 转化为烯丙基硅烷 29,然后用 m-氧化CPBA 生产全功能化的红豆杉素碳骨架。最后,