Abstract One novel flavonoid sulphate ester and two known non-sulphated flavonoids were isolated from the leaves of Flaveria chloraefolia . The novel sulphated conjugate is 7,4′-dimethylquercetin (ombuin) 3-sulphate, and the known compounds are 6-methoxyquercetin and its 3-glucoside. The structure of ombuin 3-sulphate was established by UV spectroscopy, acid hydrolysis followed by EIMS of the aglycone, as
摘要 从绿叶黄花叶中分离得到一种新型
黄酮硫酸酯和两种已知的非
硫酸化
黄酮。新型
硫酸化偶联物是 7,4'-二甲基
槲皮素 (ombuin) 3-
硫酸盐,已知化合物是 6-甲氧基
槲皮素及其 3-
葡萄糖苷。ombuin 3-sulphate 的结构是通过紫外光谱法、酸
水解和糖苷配基的 EIMS 以及酶促合成建立的。