作者:Byung-Sun Min、Cao Van Thu、Nguyen Tien Dat、Nguyen Hai Dang、Han-Su Jang、Tran Manh Hung
DOI:10.1248/cpb.56.1725
日期:——
Four new flavonoids, 3′-formyl-4′,6′,4-trihydroxy-2′-methoxy-5′-methylchalcone (1), 3′-formyl-6′,4-dihydroxy-2′-methoxy-5′-methylchalcone 4′-O-β-D-glucopyranoside (2), (2S)-8-formyl-6-methylnaringenin (3), and (2S)-8-formyl-6-methylnaringenin 7-O-β-D-glucopyranoside (4) were isolated from the buds of Cleistocalyx operculatus (Myrtaceae). The structures of the new metabolites (1—4) were determined on the basic of spectroscopic analyses including 2 dimensional NMR. Compounds 1 and 3 exhibited 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity with IC50 values of 22.8 and 27.1 μM, respectively.
四种新的黄酮类化合物:3′-甲酰基-4′,6′,4-三羟基-2′-甲氧基-5′-甲基查尔酮(1),3′-甲酰基-6′,4-二羟基-2′-甲氧基-5′-甲基查尔酮 4′-O-β-<小>D小>-吡喃葡萄糖苷(2)、(2S)-8-formyl-6-methylnaringenin (3) 和 (2S)-8-formyl-6-methylnaringenin 7-O-β-D-glucopyranoside (4)是从桃金娘科植物 Cleistocalyx operculatus 的芽中分离出来的。根据光谱分析(包括二维核磁共振)确定了新代谢物(1-4)的结构。化合物 1 和 3 具有 1,1-二苯基-2-苦基肼自由基清除活性,IC50 值分别为 22.8 和 27.1 μ<小>M小>。