Collective Syntheses of 8-Oxoprotoberberines via Sequential In(OTf)<sub>3</sub>-Catalyzed Cyclization and Pd(OAc)<sub>2</sub>-Catalyzed Heck Coupling
作者:Zenghui Sun、Xinhang Zhang、Jiayue Fu、Lianjie Zhang、Maosheng Cheng、Lu Yang、Yongxiang Liu
DOI:10.1021/acs.joc.3c00419
日期:2023.6.2
8-oxopseudopalmatine, 8-oxoberberine, and 8-oxopseudoberberine come from nature. The synthetic route was featured with the In(OTf)3-catalyzed cyclization and Heck coupling. Moreover, the syntheses of the natural products berberine, canadine, and iambertine were achieved via various reductions from 8-oxoberberine, which provided a concise approach to the syntheses of this kind of alkaloids.
共分四步合成了 6 种 8-氧代原小檗碱,收率可接受 (14-19%),其中产物 8-氧代棕榈碱、8-氧代假小檗碱、8-氧代小檗碱和 8-氧代假小檗碱来自自然界。该合成路线以In(OTf) 3催化环化和Heck偶联为特点。此外,通过8-氧代小檗碱的各种还原反应,合成了天然产物小檗碱、加拿大黄连素和黄柏碱,为这类生物碱的合成提供了一种简洁的方法。