STUDIES ON THE CHEMICAL CONSTITUENTS OF AQUILARIA SINENSIS(LOUR.) GILG. Ⅳ. ISOLATION AND CHARACTERIZATION OF 2-(2-PHENYLETHYL)CHROMONE DERIVATIVES

Six chromone derivatives were isolated from the ether soluble fraction of the alcoholic extract of Aquilaria sinensis(Lour.) Gilg.(Thymeleaceae) by silica gel chromatography. On the basis of spectrometric data (UV, IR, ¹HNMR and ¹³CNMR as well as MS) and chemical synthesis one of them was found to bea new chromone,6-hydroxy-2-2-(4'-methoxylphenyl)ethyl chromone(Ⅵ) and the other five known chromones are 2-(2-phenylethyl)chromone(Ⅰ), 6-methoxy-2-(2-phenylethyl)chromone (Ⅱ),6.7-dimethoxy-2-(2-phenylethyl)chromone(Ⅲ), 6-methoxy-2 2-(3'-methoxyphenyl)ethyl chromone(Ⅳ) and 6-hydroxy-2-(2-phenylethyl) chromone(Ⅴ). These compounds were obtained for the first time from this plant.