Synthesis of γ-Lactones via the Kowalski Homologation Reaction: Protecting-Group-Free Divergent Total Syntheses of Eupomatilones-2,5,6, and 3-<i>epi</i>-Eupomatilone-6
作者:Hosam Choi、Hanho Jang、Hyoungsu Kim、Kiyoun Lee
DOI:10.1021/acs.orglett.9b02848
日期:2019.10.4
A highly efficient synthesis of functionalized chiral γ-butyrolactone scaffolds has been described. The basis of the approach is the Kowalski ester homologation that is modified for our proposed transformation. The newly developed methodology combines a divergent synthetic strategy to permit a straightforward protecting-group-free asymmetric total syntheses of eupomatilones-2,5,6, and 3-epi-eupomatilone-6
已经描述了功能化的手性γ-丁内酯支架的高效合成。该方法的基础是Kowalski酯的同系物,该同系物针对我们提出的转化进行了修改。新开发的方法结合了多样化的合成策略,可从市售原料中分五步或六步直接合成eupomatilones-2、5、6和3 - epi -eupomatilone-6的无保护基的不对称全合成。迄今为止报道的最短的合成方法之一。