Enantioselective Modular Total Synthesis of Macrolides Sch725674 and C-4-<i>epi</i>-Sch725674
作者:Brijesh M. Sharma、Arjun Gontala、Pradeep Kumar
DOI:10.1002/ejoc.201501531
日期:2016.2
synthesis of its C-4 epimer. Key reactions of the synthetic pathway include a Jacobsen hydrolytic kinetic resolution of an epoxide followed by its regioselective opening through a Yamaguchi–Hirao alkynylation, and ring-closing metathesis reaction to furnish the unique 14-membered ring macrolactone. In addition, the influence of protecting groups on the efficiency of the ring-closing metathesis (RCM) macrocyclization
Sch725674 的收敛全合成是通过从 (R)-1,2-环氧庚烷开始并以高度立体选择性的方式组装五个模块来完成的,最终产品的总产率为 6.6%。相同的策略扩展到其 C-4 差向异构体的合成。合成途径的关键反应包括环氧化物的 Jacobsen 水解动力学拆分,然后通过 Yamaguchi-Hirao 炔基化进行区域选择性打开,以及闭环复分解反应以提供独特的 14 元环大环内酯。此外,还研究了保护基团对闭环复分解 (RCM) 大环化效率的影响,以最大限度地提高其产率。