a tetraene, and subsequent ring-closing metathesis yielded hydroazulene 4, selective epoxidation of which gave epoxy ester 3. After generation of the requisite isopropyl unit and regioselective reductive epoxide opening, the derived dienol 2 was used for the installation of the oxygen bridge through intramolecular oxymercuration followed by oxidative demercuration. The resulting allylic alcohol epimers
(+)-东方醇 F (1) 的合成以醛 6 开始,醛 6 可从 (R)-
柠檬烯中分两步获得。6 与不饱和叶立德 7 的 Wittig 反应得到四烯,随后闭环复分解得到氢化
茚4,选择性环氧化得到环氧酯 3。在生成必要的异丙基单元和区域选择性还原
环氧化物开环后,衍生的二烯醇 2 是用于通过分子内氧
汞然后氧化脱
汞安装氧桥。所得
烯丙醇差向异构体15和16通过氧化/还原序列很容易转化为目标
天然产物1。