synthesis of C17–C34 unit of antascomicin A. A diastereoselective radical cyclization strategy has been developed to construct the highly substituted cyclohexane ring with required stereochemistry present in the molecule. Other key features in the synthesis are Sharpless asymmetric epoxidation, substrate controlled regioselective epoxide opening reaction with Gilman’s reagent, dithiane mediated CC bond formation
这封信描述了antascomicin A C17–C34单元的合成。已经开发了非对映选择性自由基环化策略来构建分子中存在所需立体
化学的高度取代的
环己烷环。合成中的其他关键特征是Sharpless不对称环氧化,与吉尔曼试剂进行的底物控制的区域选择性
环氧化物开环反应,双
噻吩介导的C C键形成反应和改性的Julia烯化反应。