3-Methoxyflavones with unusual b-ring substitution from two species of Notholaena
作者:Eckhard Wollenweber、Dieter Marx、Jean Favre-Bonvin、Bernard Voirin、Mourad Kaouadji
DOI:10.1016/0031-9422(88)87041-9
日期:1988.1
Abstract The structures of two flavonoid aglycones provisionally described previously from the frond exudate of the fern Notholaena californica , need revision. They are now established as 5,2′,5′-trihydroxy-3,7,8-trimethoxyflavone and its 2′- O -methyl derivative. The first-mentioned compound is also present in the frond exudate of N. aliena , where it is accompanied by its natural 2′- O -acetate
摘要 先前从加利福尼亚蕨类蕨叶渗出液中临时描述的两种黄酮苷元的结构需要修正。它们现在被确定为 5,2',5'-三羟基-3,7,8-三甲氧基黄酮及其 2'-O-甲基衍生物。第一个提到的化合物也存在于 N. Aliela 的叶状分泌物中,在那里它伴随着它的天然 2'-O-乙酸盐。来自后一物种的另一种化合物被鉴定为 5,2',3'-三羟基-3,7,8-三甲氧基黄酮。这些新型天然 3-甲氧基黄酮因其不寻常的 B 环取代模式而引人注目。