Enantioselective synthesis of the dimeric pyranonaphthoquinone core of the cardinalins using a late-stage homocoupling strategy
作者:Jonathan Sperry、Jennifer S. Gibson、Jimmy J. P. Sejberg、Margaret A. Brimble
DOI:10.1039/b813605j
日期:——
The enantioselective synthesis of a dimeric pyranonaphthoquinone closely related to the cardinalins is described. Whilst attempts to effect a double Hauser-Kraus annulation of enone 5 were unsuccessful using both bis-phthalide 4 and bis-sulfone 21, a single annulation of cyanophthalide 28 with enone 5 furnished functionalised naphthalene 31. Suzuki-Miyaura homocoupling of the aryl triflate 29 derived
描述了与基数最接近的二聚吡喃并萘醌的对映选择性合成。虽然尝试使用双邻苯二甲酸酯4和双砜21来实现烯酮5的双重Hauser-Kraus环法均未成功,但是氰基邻苯二甲酸酯28与烯酮5的单环法提供了官能化的萘31。芳基三氟甲磺酸酯的Suzuki-Miyaura均相偶联29衍生自31的化合物实现了联芳基键的后期构建并促进了对联芳基3的获取。双立体选择性三元醇还原反应安装了吡喃环的1,3-顺式立体化学,最后的双氧化脱甲基步骤完成了模型二聚体1的制备对映体选择性合成具有基数红霉素3核心结构的吡喃并萘醌。