三桠苦中的两个异戊烯氧基黄酮及其核磁共振谱中的溶剂效应

o-Prenylated Flavonoids from Melicope pteleifolia and Their Solvent Effect on NMR

为研究三桠苦(Melicope pteleifolia)的化学成分,将三桠苦的叶用体积分数为80%乙醇渗漉提取,提取物采用色谱技术分离,用EI-MS、1H NMR、13 C NMR进行了表征。从三桠苦(乙醇渗漉提取三桠苦的提取物,再用石油醚提取)分离出2个化合物,分别鉴定为3,5,3′-三羟基-8,4′-二甲氧基-7-异戊烯氧基黄酮(1)和3,5,4′-三羟基-8,3′-二甲氧基-7-异戊烯氧基黄酮(2)。归属了化合物1的核磁共振信号,并对化合物2核磁共振谱的溶剂效应进行了讨论。

To study the constituents of Melicope pteleifolia,the leaves of title plant were percolated with volume fraction 80%EtOH.Compounds were separated by chromatography and their structures were elucidated by EI-MS,1H NMR,13 C NMR.Two compounds were isolated from the petroleum ether soluble fraction and their structures were established as 3,5,3′-trihydroxy-8,4′-dimethoxy-7-(3-methylbut-2-enyloxy)flavone(1)and 3,5,4′-trihydroxy-8,3′-dimethoxy-7-(3-methylbut-2-enyloxy)flavone(2),respectively.NMR signals of compound 1 were assigned while the effect of solvent on NMR of compound 2 was discussed.