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Phytochemical Studies on Alstonia scholaris

机译:杜鹃花的植物化学研究

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摘要

Reinvestigation of the flowers of Alstonia scholaris of Pakistan origin have resulted in the isolation of three new triterpenoids, two of the ursane type, 3β-acetate-24-nor-urs-4,12-diene ester triterpene (1) and 3β-hydroxy-24-nor-urs-4,12,28-triene triterpene (2), and one of the oleanane type, 3,28-β- diacetoxy-5-olea-triterpene (3), together with two known triterpenes, a-amyrin acetate (4) and ursolic acid (5). This is the first report of the isolation of 4 and 5 from the flower part of this species. The structures of 1 - 5 were elucidated with the aid of extensive NMR-spectroscopic studies.
机译:对巴基斯坦原产阿尔斯通的花朵进行了重新研究,结果分离出了三种新的三萜类化合物,其中两种为乌烷型,3β-乙酸盐-24-nor-urs-4,12-二烯酯三萜(1)和3β-羟基-24-nor-urs-4,12,28-三烯三萜烯(2)和一种齐墩烷类型的3,28-β-二乙酰氧基-5-油基-三萜烯(3)和两种已知的三萜烯-乙酸amyrin(4)和熊果酸(5)。这是从该物种的花朵部分中分离出4和5的首次报道。借助广泛的NMR光谱研究阐明了1-5的结构。

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