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假鹰爪(Desmos cochinensis Lour.)根的石油醚提取物中分得三个黄酮类化合物。其中化合物Ⅰ和Ⅱ分别鉴定为5,7-二羟基-6-甲酰基-8-甲基双氢黄酮(lawinal)和5,7-二羟基-6-甲酰基-8-甲基黄酮(isounonal)。Ⅲ为一含醛基的新化合物。根据光谱分析(紫外、红外、质谱、氢谱、碳谱、二维核磁共振异核位移相关谱及X-单晶衍射)证明其结构为4,7-二羟基-5-甲氧基-6-甲基-8-甲酰基黄烷。化合物Ⅰ和Ⅱ均属首次从该植物中分得。
Three flavonoids were isolated from the petroleum ether extract of the root of Desmos cochinensis Lour. Among them, compounds I and II were identified as 5,7-dihydroxy-6-formyl-8-methyl-dihydroflavone (lawinal) and 5,7-dihydroxy-6-formyl-8-methylflavone (isounonal), respectively. ). III is a new compound containing an aldehyde group. According to spectral analysis (ultraviolet, infrared, mass spectrometry, hydrogen spectrum, carbon spectrum, 2D NMR heteronuclear shift correlation spectrum and X-single crystal diffraction), the structure was proved to be 4,7-dihydroxy-5-methoxy-6 -Methyl-8-formylflavan. Both compounds I and II were isolated from the plant for the first time.