Vinylation of N-Boc-2-pyrrolidinylcuprate reagents with functionalized vinyl iodides followed by N-Boc deprotection and cyclization affords 1-methylidine pyrrolizidine and indolizidine carbon skeletons. Functional group manipulation of the exo-cyclic olefin provides direct synthetic entries to the pyrrolizidine alkaloids (±)-isoretronecanol, (±)-curassanecine, (±)-heliotridane or the indolizidine alkaloids
用功能化的
乙烯基碘对N -Boc-2-
吡咯烷基
铜酸酯试剂进行
乙烯基化,然后对N -Boc脱保护和环化,得到1-
甲基吡啶并
吡咯并核苷和
吲哚并
吡啶的碳骨架。所述的官能团操作外-环状烯烃提供了直接合成条目到双
吡咯烷类
生物碱(±)-isoretronecanol,(±)-curassanecine,(±)-heliotridane或
吲哚里
生物碱(±)-tashiromine和(±)-epitashiromine。这种合成
吡咯烷啶和
吲哚唑烷
生物碱的方法需要在涉及烯烃官能团的官能团相互转化过程中掩蔽叔胺。