A Unified Approach for the Stereoselective Total Synthesis of Pyridone Alkaloids and Their Neuritogenic Activity
作者:Henning Jacob Jessen、Andreas Schumacher、Travis Shaw、Andreas Pfaltz、Karl Gademann
DOI:10.1002/anie.201007671
日期:2011.4.26
neurite outgrowth might constitute a valuable approach for the non‐invasive medical treatment of neurodegenerative diseases. With the aid of a bifunctional building block, the total syntheses of a group of pyridone polyenes originally produced by entomopathogenic fungi was achieved (see picture). All of these natural products displayed neuritogenicactivity in the PC‐12 cell line.
Asymmetric total synthesis of an acetate analogue of the endophytic unstable secondary metabolite bipolamide A has been achieved for the first time adopting a convergent approach. The key feature of this synthesis includes Evans's asymmetric ethylation, Wittig olefination, Takai olefination, stereoselective Grignard addition and intermolecular Heck coupling. This eventually developed a synthetic route
首次采用收敛方法实现了内生不稳定次级代谢物 bipolamide A 的乙酸酯类似物的不对称全合成。该合成的关键特征包括 Evans 的不对称乙基化、Wittig 烯化、Takai 烯化、立体选择性格氏加成和分子间 Heck 偶联。这最终开发了一种很少发现的带有 acyloin 部分的支化胺的合成路线。我们的合成最终明确地建立了天然存在的不稳定双酚酰胺 A 的未指定 C-8 中心的立体化学。