Establishing the Absolute Configuration of the Asbestinins: Enantioselective Total Synthesis of 11-Acetoxy-4-deoxyasbestinin D
作者:Michael T. Crimmins、J. Michael Ellis
DOI:10.1021/ja056921x
日期:2005.12.1
stereoselective synthesis of 11-acetoxy-4-deoxyasbestinin D (1) has been completed in 26 linear steps. The synthesis hinges on a selective glycolate aldol addition to establish the C-2 stereocenter, a ring-closing metathesis reaction to complete the oxonene, and an intramolecular Diels-Alder cycloaddition to establish the relative configuration at C-1, C-10, and C-14. This initial total synthesis of an asbestinin
11-乙酰氧基-4-脱氧石棉素 D (1) 的高度立体选择性合成已在 26 个线性步骤中完成。合成取决于选择性乙醇酸醛醇加成以建立 C-2 立体中心、闭环复分解反应以完成氧酮,以及分子内 Diels-Alder 环加成以建立 C-1、C-10 和C-14。石棉素的这种初始全合成也用于确认 C-2-C-11 环化西松天然产物亚类的绝对构型。