作者:David A. Evans、David H. B. Ripin、David P. Halstead、Kevin R. Campos
DOI:10.1021/ja990789h
日期:1999.7.1
The first total synthesis of the marine macrolide miyakolide has been achieved, and its absolute stereochemistry has been determined. The carbon skeleton is assembled in a convergent fashion from three fragments via esterification, [3 + 2] dipolar cycloaddition, and aldol addition. The utility of β-ketoimide aldol reactions in fragment coupling was demonstrated on fully elaborated intermediates. The
首次实现了海洋大环内酯类的全合成,并确定了其绝对立体化学。碳骨架由三个片段通过酯化、[3 + 2] 偶极环加成和羟醛加成以会聚方式组装。β-酮亚胺醛醇反应在片段偶联中的效用在完全精心设计的中间体上得到了证明。偶联材料被转化为含有 1,3,7-三酮的大环,该大环经历了简单的跨环醛醇反应,然后进行半缩酮化,形成天然产物的氧化萘烷环系统。脱保护得到 ent-miyakolide,其以 6.8% 的总产率和 29 个线性步骤生产。