A 1,3-diene-ene ring-closing metathesis (RCM) strategy was investigated for assembling the 16-membered macrolactone core of the plecomacrolides. It was found that the desired (10E,12E)-diene unit could be constructed from the fully functionalized C13-C17 homoallyl alcohol fragment and the C1-C12 acid fragment possessing one E double bond at C2-C3 or C3-C4. The functional groups at C2 and C3 resulted in preferential formation of the undesired (12Z)-macrolactone, while additional appended groups at C6-C8 furnished the (12Z)-macrolactone as the sole RCM product.
研究人员采用 1,3-二
烯-
烯环闭合偏合成 (RCM) 策略组装了 plecomacrolides 的 16 元大内
酯核心。研究发现,所需的(10E,12E)-二
烯单元可由完全官能化的 C13-C17 均
烯丙基醇片段和在 C2-C3 或 C3-C4 处具有一个 E 双键的 C1-C12 酸片段构建而成。C2 和 C3 上的官能团会优先形成不需要的 (12Z)- Macrolactone,而 C6-C8 上的附加官能团则会生成 (12Z)- Macrolactone 作为唯一的 RCM 产物。