Iterative Deoxypropionate Synthesis Based on a Copper-Mediated Directed Allylic Substitution: Formal Total Synthesis of Borrelidin (C3–C11 Fragment)
作者:Christian Herber、Bernhard Breit
DOI:10.1002/chem.200600343
日期:2006.8.25
alkylation strategies such as enolate reactivity as well as costs and problems associated with the chiral auxiliary. Practicability of this new method is demonstrated through application in natural product syntheses. Thus, an efficient synthesis of the northern part of the angiogenesis inhibitor borrelidin (28), the deoxypropionate building block 27, could be devised, representing a formal total synthesis
提出了一种灵活制备任何低聚脱氧丙酸酯立体异构体的新的迭代策略,该策略依赖于对映体纯的格氏试剂的邻-DPPB-定向的铜介导的烯丙基取代。该反应在反应选择性的所有方面都得到了完美的控制。与已建立的烯醇盐烷基化方法相比,这一关键的CC键形成步骤具有相反的极性。因此,它避免了烯醇盐烷基化策略的现有问题,例如烯醇盐反应性以及与手性助剂相关的成本和问题。通过在天然产物合成中的应用证明了这种新方法的实用性。因此,可以设计出一种有效的血管生成抑制剂硼瑞林(28)北部的合成方法,即脱氧丙酸酯结构单元27,