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作者从山豆科山豆根(Sophora subprostrata Chun et T.Chen)分离出两种黄酮甙(Ⅰ)和(Ⅱ)。 (Ⅰ)是橙黄色针状结晶,熔点176℃,分子式C_(25)H_(26)O_5,分子量406。紫外吸收光谱(λ_(max)~(乙醇)403毫微米)显示有查耳酮的骨架。核磁共振光谱显示有2,2-二甲基色烯环和异戊烯基各一个,红外吸收光谱显示有与羟基共轭的羰基的吸收。由(Ⅰ)甲基化而得到的二甲醚(Ⅲ)有一个羟基,由(Ⅲ)还原可得六氢化体。根据紫外吸收光谱可推定(Ⅰ)的羟基置换位置在2’,4位上;从(Ⅲ)的核磁共振光谱可推断
The authors isolated two flavonoid glycosides (I) and (II) from Sophora subprostrata Chun et T Chen. (Ⅰ) is an orange-yellow needle crystal, melting point 176 ℃, molecular formula C_ (25) H_ (26) O_5, molecular weight of 406. The ultraviolet absorption spectrum (λ max (ethanol) 403 nm) shows the chalcone skeleton. The nuclear magnetic resonance spectrum showed one each of 2,2-dimethylchromene ring and isopentenyl group, and the infrared absorption spectrum showed the absorption of the carbonyl group conjugated to the hydroxyl group. Dimethyl ether (Ⅲ) obtained from the methylation of (Ⅰ) has a hydroxyl group, which can be reduced by (Ⅲ) to obtain hexahydroxide. According to the ultraviolet absorption spectrum, it can be inferred that the hydroxyl substitution position of (I) is in the 2 ’and 4 positions; from the nuclear magnetic resonance spectrum of (III), it can be inferred