described. Novel reactions were developed that extend the utility of the asymmetric glycolate alkylation reaction and improve scale-up to provide gram quantities of the B and E subunits. Significant improvements to the convergent assembly of the tetracycle were also realized. In addition, formation of the A ring lactone was accomplished to complete the ABCDE pentacycle.
描述了短毒素A BCDE片段的第二代合成。开发了新的反应,其扩展了不对称
乙醇酸酯烷基化反应的效用并改善了放大规模,从而提供了克量的B和E亚基。还实现了对四环会聚组件的重大改进。另外,完成了A环内酯的形成以完成ABCDE五环。