Construction of the 5,10b-Phenanthridine Skeleton Using [3+2]-Cycloaddition of a Non-Stabilized Azomethine Ylide: Total Synthesis of (±)-Maritidine and (±)-Crinine Alkaloids
作者:Ganesh Pandey、Nishant R. Gupta、Smita R. Gadre
DOI:10.1002/ejoc.201001263
日期:2011.2
well as stereochemical origin of this cycloaddition reaction is explained through a favorable transition state 9". The strategy is successfully applied for the total synthesis of the biologically active alkaloids (±)-maritidine (1a), (±)-crinine (1b), and their analogues (1d, 1e, and 1f).
5,10b-菲啶骨架 1 的邻四级和三级立体中心通过非稳定化偶氮甲碱叶立德 9 的 [3+2]-环加成一步同时构建,通过使用氟化银(I)对 10 进行连续双脱甲硅烷基化生成作为单电子氧化剂。该环加成反应的区域和立体化学起源通过有利的过渡态 9" 来解释。该策略成功应用于生物活性生物碱 (±)-maritidine (1a), (±)-crinine 的全合成(1b) 及其类似物(1d、1e 和 1f)。