Scalable Asymmetric Total Syntheses of (+)-Psoracorylifol B and (+)-<i>ent</i>-Psoracorylifol C
作者:Jingyun Ren、Yuan Liu、Liyan Song、Rongbiao Tong
DOI:10.1021/ol501120m
日期:2014.6.6
The first, asymmetric total syntheses of potent antimicrobial Psoracorylifol B (>1.3 g obtained, dr 10.5:1) with a 9.4% overall yield on a gram scale in 14 steps and ent-Psoracorylifol C with a 4.3% yield in 16 steps were achieved. The key features of our synthesis include (i) sequential, rarely explored Achmatowicz rearrangement/bicycloketalization to construct the 6,8-dioxabicyclo[3.2.1]octane core
第一步,以克为标准,以克为标准,以14步的总产率为9.4%,合成了有效的抗菌药物Psoracorylifol B(> 1.3 g,dr 10.5:1),并完成了对-Psoracorylifol C的不对称总合成,产率为9.4%。。我们合成的关键特征包括:(i)顺序进行的,很少探索的Achmatowicz重排/双环缩酮化反应以构建6,8-二氧杂双环[3.2.1]辛烷核;(ii)Cu介导的S N 2'甲基化或Johnson-Claisen重新排列以有选择地安装全碳四元立体中心。这种简洁,高效且可扩展的合成途径可为快速,实用地获得补骨脂素及其类似物进行进一步的生物活性评估提供途径。