研究了天然产物mar霉素A的全合成。以脱羧烷基化,Pd(OAc)2催化的环化,芳构化和CN偶联为关键步骤,建立了关键片段8-氨基-3-甲基苯并[ a ]蒽醌(1)的快速合成策略。然而,由于无法获得碳水化合物片段2,mar霉素A的最终组装受阻。取而代之的是,使用InBr 3催化的C-和N以适度的产率制备了一个小霉素霉素A的去甲基类似物文库-糖基化反应。这些化合物的绝对构型通过将其光谱数据与with霉素A的光谱数据进行比较,并通过X射线分析得以证实。
研究了天然产物mar霉素A的全合成。以脱羧烷基化,Pd(OAc)2催化的环化,芳构化和CN偶联为关键步骤,建立了关键片段8-氨基-3-甲基苯并[ a ]蒽醌(1)的快速合成策略。然而,由于无法获得碳水化合物片段2,mar霉素A的最终组装受阻。取而代之的是,使用InBr 3催化的C-和N以适度的产率制备了一个小霉素霉素A的去甲基类似物文库-糖基化反应。这些化合物的绝对构型通过将其光谱数据与with霉素A的光谱数据进行比较,并通过X射线分析得以证实。
To turn side products into major products, a novel strategy to access biologically active 4-aminocyclopent-2-enones was developed. These compounds were originally identified as side products but became major products when 3,5-dimethylpyran-3,4-diol 7a was used as the substrate and 30% InBr3 as the catalyst. Aryl- or heteroarylamines as well as variously substituted glycals can be used in this reaction, and the corresponding 4-aminocyclopent-2-enones were obtained in moderate to good yields. These compounds can be further used to prepare 4-aminocarbocyclic nucleosides.