Welwistatin Support Studies: Expansion and Limitation of Aryllead(IV) Coupling Reactions
作者:Jibo Xia、Lauren E. Brown、Joseph P. Konopelski
DOI:10.1021/jo071156l
日期:2007.8.31
target step involves lead-mediated arylation of sterically demanding aryl groups and carbon acid coupling partners in order to establish the highly congested tetracyclic core structure. Type 7 β-ketoesters and β-ketonitriles were successfully arylated with a variety of ortho- and meta-substituted aryllead compounds generated by a halogen−boron−lead exchange sequence. The enolates of compounds 15, 19
描述了有关welwistatin系统总合成的最新支持研究。目标步骤涉及空间需要的芳基和碳酸偶联剂的铅介导的芳基化,以建立高度拥挤的四环核结构。键入7 β酮酯和β酮腈成功芳基化与各种被卤素-硼-铅交换序列生成邻位和间位取代的芳基铅化合物。化合物的烯醇化物15,19,和25,邻近该芳基化位点,每个轴承的全碳季中心,未能耦合。