Yu Shaofu, Fu Shuna, Liu Bailian, Zhang Ying, Zhou Guangxiong
a Institute of Traditional Chinese Medicine and Natural Products, Jinan University , Guangzhou 510632 , P.R. China.
Nat Prod Res. 2015;29(14):1336-41. doi: 10.1080/14786419.2014.1001389. Epub 2015 Feb 6.
Two new quercetin glycoside derivatives named quercetin-3-O-[2-O-trans-caffeoyl-α-L-rhamnopyranosyl-(1 → 6)-β-D-glucopyranoside] (1) and quercetin-3-O-[2-O-trans-caffeoyl-β-L-rhamnopyranosyl-(1 → 6)-β-D-glucopyranoside] (2) along with three known flavonoids, 5-hydroxy-6,7,3',4',5'-pentamethoxyflavone (3), 5,7-dihydroxy-8-methoxyflavone (4) and kaempferol 3-O-β-D-glucopyranoside (5), were isolated from the fruits of Gardenia jasminoides var. radicans. The structures of the new compounds were determined by means of extensive spectroscopic analysis (1D, 2D NMR and HR-ESI-MS), glycoside hydrolysis and sugar HPLC analysis after derivatisation. This is the first report on the isolation of a pair of compounds with α or β-L-rhamnopyranosyl configuration from plant and the first detail assignment of their NMR data.
从栀子变种的果实中分离出两种新的槲皮素糖苷衍生物，分别命名为槲皮素-3-O-2-O-反式咖啡酰基-α-L-鼠李糖基-(1→6)-β-D-葡萄糖苷和槲皮素-3-O-2-O-反式咖啡酰基-β-L-鼠李糖基-(1→6)-β-D-葡萄糖苷，以及三种已知的黄酮类化合物，5-羟基-6,7,3',4',5'-五甲氧基黄酮(3)、5,7-二羟基-8-甲氧基黄酮(4)和山柰酚3-O-β-D-葡萄糖苷(5)。通过广泛的光谱分析(1D、2D NMR和HR-ESI-MS)、糖苷水解以及衍生化后的糖HPLC分析确定了新化合物的结构。这是首次从植物中分离出一对具有α或β-L-鼠李糖基构型的化合物，并首次对其NMR数据进行详细归属。
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