Evaluation of Furan Photooxygenation as a Device for Construction of the Zaragozic Acid (Squalestatin) Core
作者:Naoyoshi Maezaki、Harrie J. M. Gijsen、Li-Qiang Sun、Leo A. Paquette
DOI:10.1021/jo960963+
日期:1996.1.1
A practical application of the photooxygenation chemistry of 3-substituted furans to construction of the zaragozic acid/squalestatin backbone is described. Although addition of 3-lithiofuran to the tartrate-derived aldehyde 7 proceeds without chelation control to give a 1:1 mixture of diastereomeric alcohols 8, it is demonstrated initially that ready conversion to the polyfunctional intermediate 10
描述了3-取代的呋喃的光氧化化学在构建查拉戈兹酸/角鲨烯骨架上的实际应用。尽管在没有螯合控制的情况下向酒石酸衍生的醛7中添加了3-lithiofuran,以得到非对映异构醇8的1:1混合物,但最初证明了通过单峰连续处理9可以容易地转化为多官能中间体10氧,硼氢化钠和三异丙基甲硅烷基三氟甲磺酸盐。实际的对映控制路线包括在与AD-mix-β进行不对称二羟基化之前,将8氧化为酮,然后进行Wittig烯化。一旦完成了这一系列的转化,就可以通过完全可比的光氧化来形成目标产物30。