Convergent Total Synthesis of Khafrefungin and Its Inhibitory Activity of Fungal Sphingolipid Syntheses
作者:Shū Kobayashi、Kouhei Mori、Takeshi Wakabayashi、Satoshi Yasuda、Kentaro Hanada
DOI:10.1021/jo0158128
日期:2001.8.1
A convergent total synthesis of khafrefungin, a novel inhibitor of fungal sphingolipid syntheses isolated from the fermentation culture MF6020, has been developed. Alkenylboronic acid 5 and alkenyliodide 6, key fragments for the total synthesis, were prepared from the corresponding achiral aldehydes using tin(II)-catalyzed and Zr(IV)-catalyzed asymmetric aldol reactions, respectively. The Suzuki coupling
已经开发了从发酵培养物MF6020中分离出来的一种新型的真菌鞘脂合成抑制剂-khafrefungin的聚合全合成。分别使用锡(II)催化和Zr(IV)催化的不对称醛醇缩合反应,由相应的非手性醛制备了总合成关键片段的烯基硼酸5和烯基碘6。这两个片段的Suzuki偶联反应成功进行,以高收率得到17。通过全合成,没有发生具有相当高的酸性质子的C4位的差向异构化,这表明khafrefungin处于严格的构象约束下以防止差向异构化过程。khafrefungin的这种特征稳定性也已使用半经验计算和综合进行了讨论。最后,