Concise and Highly Stereoselective Synthesis of the C20–C26 Building Block of Halichondrins and Eribulin
作者:Mingde Shan、Yoshito Kishi
DOI:10.1021/ol203373d
日期:2012.1.20
A concise, stereoselective, and scalable synthesis of the C20–C26 building block of halichondrins and Eribulin is reported. The synthesis relies on three key transformations: regiospecific Ru-catalyzed intramolecular hydrosilylation, highly stereoselective SN2′ substitution, and selective conversion of a C–Si to C–I bond. It is carried out in a 5-pot/4-workup operation without chromatographic purification
据报道,一种简单,立体选择性和可扩展的合成的葫芦素和依立布林C20–C26结构单元。合成依赖于三个关键的转变:区域特异性Ru催化的分子内氢化硅烷化,高度立体选择性的S N 2'取代和C–Si到C–I键的选择性转化。除通过硅胶塞过滤外,该方法无需色谱纯化即可进行5罐/ 4处理操作,得到的C20–C26结构单元(dr > 200:1;ee > 99%) 。环氧化物1的总产率为60%。