Enantioselective Total Synthesis of the Proposed Structure of the Endophytic Fungal Metabolite Phomolide G: Structural Revision and Unambiguous Stereochemical Assignment
作者:James McNulty、David McLeod、Hilary A. Jenkins
DOI:10.1002/ejoc.201501592
日期:2016.2
A total synthesis of the proposed structure of the natural macrolactone phomolide G (1) by a bidirectional strategy from L-tartaric acid is reported. The ω-terminus of the molecule was elaborated by nitrile extension, C3-alkylation and a substrate-controlled 1,3-ketone reduction. The α-terminus was extended by a C2 aldehyde-to-alkenal homologation followed by an auxiliary controlled aldol reaction
报告了通过来自 L-酒石酸的双向策略对天然大环内酯 phomolide G (1) 的拟议结构进行全合成。分子的 ω 末端通过腈延伸、C3-烷基化和底物控制的 1,3-酮还原来精心设计。α-末端通过 C2 醛到链烯醛的同源性延伸,然后是辅助控制的醛醇反应。大环内酯化和脱保护产生化合物 1(通过 X 射线分析证实)。与天然产物相比,phomolide G 的这种假定结构显示出不一致的 NMR 光谱数据。对所有可用 NMR 光谱数据的详细检查表明,phomolide G 可能是 1 的非对映异构体。开发的合成策略允许控制所有四个手性仲醇基团的绝对立体化学。