Total Syntheses of Prenylated Isoflavones from <i>Erythrina sacleuxii</i> and Their Antibacterial Activity: 5-Deoxy-3′-prenylbiochanin A and Erysubin F
作者:George Kwesiga、Alexandra Kelling、Sebastian Kersting、Eric Sperlich、Markus von Nickisch-Rosenegk、Bernd Schmidt
DOI:10.1021/acs.jnatprod.0c00932
日期:2020.11.25
The prenylated isoflavones 5-deoxyprenylbiochanin A (7-hydroxy-4′-methoxy-3′-prenylisoflavone) and erysubin F (7,4′-dihydroxy-8,3′-diprenylisoflavone) were synthesized for the first time, starting from mono- or di-O-allylated chalcones, and the structure of 5-deoxy-3′-prenylbiochanin A was corroborated by single-crystal X-ray diffraction analysis. Flavanones are key intermediates in the synthesis.
首次合成了异黄酮 5-deoxyprenylbiochanin A (7-hydroxy-4'-methoxy-3'-prenylisoflavone) 和 erysubin F (7,4'-dihydroxy-8,3'-diprenylisoflavone)。 - 或二-O-烯丙基化查耳酮,5-脱氧-3'-异戊二烯生物链素A的结构通过单晶X射线衍射分析得到证实。黄烷酮是合成中的关键中间体。它们与高价碘试剂反应通过 2,3-氧化重排得到异黄酮,通过 2,3-脱氢得到相应的黄酮异构体。这使得合成 7,4'-二羟基-8,3'-二异戊二烯黄酮,一种赤霉素 F 的非天然区域异构体。 Erysubin F ( 8 ), 7,4'-二羟基-8,3'-二异戊二烯黄酮 ( 27 ) , 和 5-deoxy-3'-prenylbiochanin A (7 ) 针对三种细菌菌株和一种真菌病原体进行了测试。所有