Studies directed towards the total synthesis of koshikalide: stereoselective synthesis of the macrocyclic core
作者:Arramshetti Venkanna、Eppakayala Sreedhar、Bandi Siva、Katragadda Suresh Babu、Kothakonda Rajendra Prasad、Janaswamy Madhusudana Rao
DOI:10.1016/j.tetasy.2013.07.002
日期:2013.9
The stereoselective synthesis of the macrolactone core of the natural product koshikalide is described. Starting with readily available 1,4-butanediol and malic acid as synthons, our synthetic strategy involved the reiterative application of Gilman’s reaction, Swern oxidation and Sharpless asymmetric epoxidation to establish the required stereocentres. Other key steps in the synthesis include Negishi
描述了天然产物koshikalide大内酯核的立体选择性合成。从容易获得的1,4-丁二醇和苹果酸作为合成子开始,我们的合成策略涉及吉尔曼反应的重复应用,Swern氧化和Sharpless不对称环氧化,以建立所需的立体中心。合成过程中的其他关键步骤包括Negishi交叉偶联和用于构建主要片段的Horner-Wadsworth-Emmons(HWE)反应。通过选择性的Mitsunobu大内酯化方法制备14元内酯环。