Diastereoselective Synthesis of Glutamate-Appended Oxolane Rings: Synthesis of (<i>S</i>)-(+)-Lycoperdic Acid
作者:Jamie L. Cohen、A. Richard Chamberlin
DOI:10.1021/jo7017137
日期:2007.11.1
The stereocontrolled synthesis of the glutamate-containing natural product (S)-(+)-lycoperdic acid is described. The key transformation in the synthetic route was an efficient diastereoselective annulation of an oxolane ring onto a pyroglutamate scaffold to construct either a γ,γ-disubstituted glutamate-appended tetrahydrofuran or a γ-lactone. The reaction sequence also featured an improved method
描述了含谷氨酸的天然产物(S)-(+)-乙二酸的立体控制合成。合成途径中的关键转变是将氧杂环戊烷环高效地非对映选择性环化到焦谷氨酸骨架上,以构建γ,γ-二取代谷氨酸附加的四氢呋喃或γ-内酯。该反应序列还具有改进的方法,用于以高产率卤化焦谷氨酸衍生物,并具有增强的立体选择。