8‐Prenylflavanones through Microwave Promoted Tandem Claisen Rearrangement/6‐<i>endo</i>‐trig Cyclization and Cross Metathesis
作者:Christiane Schultze、Stefan Foß、Bernd Schmidt
DOI:10.1002/ejoc.202001378
日期:2020.12.20
Microwave irradiation of ortho‐allyloxy chalcones promotes a tandem sequence of Claisen rearrangement and 6‐endo‐trig‐cyclization. Olefin cross metathesis then furnishes prenylated flavonoids. The method has, inter alia, been applied to the synthesis of an angular chromene‐annellated natural product and its linear isomer. Both occur in medicinal plants indigenous in India and Nigeria respectively.
微波照射邻烯丙氧基查耳酮可促进克莱森重排和6-内-trig环化的串联序列。烯烃交叉复分解然后提供异戊烯基黄酮。该方法除其他外,已用于合成角铬烯化的天然产物及其线性异构体。两者都分别发生在印度和尼日利亚本土的药用植物中。