Total Synthesis of Ophiorrhine A, G and Ophiorrhiside E Featuring a Bioinspired Intramolecular Diels–Alder Cycloaddition**
作者:Wei Cao、Yingchao Dou、Cyrille Kouklovsky、Guillaume Vincent
DOI:10.1002/anie.202209135
日期:2022.9.19
A late stage bioinspired intramolecular Diels–Alder cycloaddition of the indolopyridone of ophiorrhiside E was deployed to access the spirocyclic azabicyclic[2.2.2]octanone ring system of ophiorrhiside A and achieve its total synthesis. The indolopyridone of ophiorrhiside E was synthesized by the cyclodehydration of ophiorrhine G which was formed by the acylation of N-methyl indolylacetamide by a secologanin
采用后期仿生分子内 Diels-Alder 环加成法对蛇草苷 E 的吲哚并吡啶酮进行环加成,以获取蛇草苷 A 的螺环氮杂双环[2.2.2]辛酮环系统并实现其全合成。蛇草苷E的吲哚并吡啶酮是通过蛇草碱G的环化脱水合成的,蛇草碱G是由N-甲基吲哚基乙酰胺被赛洛加宁衍生物酰化形成的。
Tietze, Lutz F.; Meier, Heinrich; Nutt, Heinrich, Liebigs Annalen der Chemie, 1990, p. 253 - 260