Total synthesis of dihydrolysergic acid and dihydrolysergol: development of a divergent synthetic strategy applicable to rapid assembly of D-ring analogs
作者:Kiyoun Lee、Yam B. Poudel、Christopher M. Glinkerman、Dale L. Boger
DOI:10.1016/j.tet.2015.05.093
日期:2015.9
The total syntheses of dihydrolysergic acid and dihydrolysergol are detailed based on a Pd(0)-catalyzed intramolecular Larock indole cyclization for the preparation of the embedded tricyclic indole (ABC ring system) and a subsequent powerful inverse electron demand Diels–Alder reaction of 5-carbomethoxy-1,2,3-triazine with a ketone-derived enamine for the introduction of a functionalized pyridine,
二氢麦角酸和二氢麦角醇的全合成基于 Pd(0) 催化的分子内 Larock 吲哚环化制备嵌入式三环吲哚(ABC 环系)以及随后的强反电子需求 Diels-Alder 反应 5-甲氧基-1,2,3-三嗪与酮衍生的烯胺引入官能化吡啶,作为显着非对映选择性还原成N-甲基哌啶 D 环的前体。通过设计,使用相同的酮衍生烯胺和一组相关的互补杂环氮杂二烯[4+2]环加成反应,允许在后期阶段制备一系列替代杂环衍生物,而这是更传统的方法不易获得的。