A Cascade Approach for the Synthesis of 5-(Indol-3-yl)hydantoin: An Application to the Total Synthesis of (±)-Oxoaplysinopsin B
作者:Ponnusamy Pon Sathieshkumar、Metlapalli Durga Anand Saibabu、Rajagopal Nagarajan
DOI:10.1021/acs.joc.0c02435
日期:2021.3.5
A cascade approach to the synthesis of 5-(indol-3-yl)hydantoin framework has been developed by the reaction of indole with glyoxylic acid/pyruvic acid under a deep eutectic solution, (+)-tartaric acid-dimethylurea. N,N′-Dimethylurea from a deep eutectic solution functions as a reactant as well as a solvent mixture. Isolation of the intermediate, 5-hydroxyhydantoin, and its reaction with indole provides
通过在深共晶溶液(+)-酒石酸-二甲基脲中吲哚与乙醛酸/丙酮酸的反应,已经开发出一种5-(吲哚-3-基)乙内酰脲骨架合成的级联方法。来自深共晶溶液的N,N'-二甲基脲起反应物以及溶剂混合物的作用。中间体5-羟基乙内酰脲的分离及其与吲哚的反应为该反应提供了机械证据。该方法已成功应用于生物碱(±)-氧代皂苷B的首次全合成,总收率为48%。