The Total Synthesis of Dynemicin A Leading to Development of a Fully Contained Bioreductively Activated Enediyne Prodrug
作者:Matthew D. Shair、Tae Young Yoon、Karoline K. Mosny、T. C. Chou、Samuel J. Danishefsky
DOI:10.1021/ja960040w
日期:1996.1.1
The title compound has been synthesized as its racemate in 33 steps. An intramolecular Diels−Alder reaction (see Scheme 5, 24 → 25) was used to provide control over the eventual cis C4−C7 relationship. The installation of another cis related ethynyl group at C2 arose from transformation 40 → 42 (see Scheme 8) whose directionality is governed by a benzophenone ketal functioning as a temporary steric
标题化合物已在 33 个步骤中合成为其外消旋物。分子内 Diels-Alder 反应(参见方案 5, 24 → 25)用于控制最终的顺式 C4-C7 关系。在 C2 处安装另一个顺式相关乙炔基来自转化 40 → 42(参见方案 8),其方向性由作为临时空间控制单元的二苯甲酮缩酮控制。在三甲基甲硅烷基乙氧基羰基 (TEOC) 保护的二氢喹啉衍生物上完成烯二炔单元的闭合。它涉及使用一种新型的双碘炔/二甲基亚乙基内插耦合转换(61 + 58 → 63,方案 12)。在合成的最后阶段,如方案 17 所示,将新型亚氨基醌缩酮 74(方案 15)与同邻苯二甲酸酐衍生物 78(方案 16)缩合。最后的脱保护包括甲氧基甲酯和两个甲氧基甲基苯酚醚的裂解。从这项工作中,产生了对醌莫...