Two new chromones and a new flavone glycoside from Imperata cylindrica

试图学习 Imperata cylindrica 的根茎的化学成分。混合物被硅石胶化和 Sephadex LH-20 列层析孤立的方法。他们的结构主要被分光镜的分析包括红外， HR-ESI-MS， 1D-NMR 和 2D-NMR 阐明。结果二新 chromones ，8-hydroxy-2-( 2-phenylethyl ) chromone ( 1 )和2-( 2-phenylethyl ) chromone-8-O -- D-glucopyranoside ( 2 )，和新黄酮 glycoside ， 4-methoxyflavone-6-O--D-glucopyranoside ( 5 )与五已知的混合物一起， flidersiachromone ( 3 )，5-hydroxy-2-( 2-phenylethyl ) chromone ( 4 )，黄酮( 6 )， 4-hydroxy-5-methoxyflavone ( 7 )和 5-hydroxyflavone ( 8 )从 Imperata cylindrica 被孤立。结论混合物 1， 2 和 5 是新混合物。

AIM： To study the chemical constituents of the rhizomes of lmperata cylindrica. METHODS： The compounds were isolated by silica gel and Sephadex LH-20 column chromatography. Their structures were elucidated mainly by spectroscopic analyses including IR, HR-ESI-MS, 1D- and 2D-NMR. RESULTS： Two new chromones, 8-hydroxy-2-（2-phenylethyl）chromone （1） and 2-（2-phenylethyl） chromone-8-O-β-D-glucopyranoside （2）, and a new flavone glycoside, 4＇-methoxyflavone-6-O-β-D- glucopyranoside （5）, along with five known compounds, flidersiachromone （3）, 5-hydroxy-2-（2-phenylethyl） chromone （4）, flavone （6）, 4＇-hydroxy-5-methoxyflavone （7） and 5-hydroxyflavone （8） were isolated from Imperata cylindrica. CONCLUSION： Compounds 1, 2 and 5 were new comoounds.