Differential Use of Anhydropyranosides for Enantiopure Routes to Bis-γ-butyrolactones: A New Approach to the Frameworks of Antibiotic and Anticancer Agents Isoavenaciolide and Ethisolide
作者:Taleb H. Al-Tel、Raed A. Al-Qawasmeh、Salim S. Sabri、Wolfgang Voelter
DOI:10.1021/jo900192a
日期:2009.7.3
Regio- and chemoselective syntheses of enantiopure bis-furanoids are described. These compounds are chirons for several families of bioactive natural products, including isoavenaciolide and ethisolide. Reaction of a 3,4-epoxy pyran with β-ketoester dianions delivers substituted pyranosides in high yield. Cyclization then yields fused furan-pyran intermediates. Oxidation, deprotection, and rearrangement
描述了对映体双呋喃类化合物的区域和化学选择性合成。这些化合物是几种生物活性天然产物(包括异金刚烷内酯和乙异内酯)的卡隆。3,4-环氧吡喃与β-酮酸酯二价阴离子的反应以高收率提供了取代的吡喃糖苷。然后环化产生稠合的呋喃-吡喃中间体。氧化,脱保护和重排导致具有呋喃乙草胺和异avenaciolide必不可少的框架和立体化学的双呋喃类化合物。