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