Two prenylcoumarins, XII and XIII, were isolated from the root of Angelica pubescens MAXIM. (Umbelliferae) growing in Japan, together with eleven known coumarins, osthol (I), bergapten (II), glabra-lactone (III), angelol (IV), psoralen (V), xanthotoxin (VI), isopimpinellin (VII), byak-angelicin (VIII), coumurrayin (IX), 7-methoxy-8-senecioylcoumarin (X) and scopoletin (XI). The structures of XII and XIII were elucidated as 8-(3-hydroxyisovaleroyl)-5, 7-dimethoxycoumarin and 5-isopentenyloxy-7-methoxy-8-senecioylcoumarin, respectively, by chemical and spectral studies. XIII is a new natural prenylcoumarin, and was named angelin.
从生长在日本的当归(伞形科)的根中分离出两种异
戊烯基
香豆素,即XII和XIII,以及11种已知的
香豆素,即osthol(I)、bergapten(II)、glabra-lactone(III)、angelol(IV)、psoralen(V)、xanthotoxin(VI)、isopimpinellin(VII)、byak-angelicin(VIII)、coumurrayin(IX)、7-methoxy-8-senecioylcoumarin(X)和scopoletin(XI)。通过
化学和光谱研究,XII和XIII的结构分别被阐明为8-(3-羟基异戊酰基)-5,7-二甲氧基
香豆素和5-异
戊烯氧基-7-甲氧基-8-千里光基
香豆素。XIII是一种新的天然异
戊烯基
香豆素,被命名为angelin。