Two new β-hydroxy amino acid-coupled secoiridoids from the flower buds of Lonicera japonica: Isolation, structure elucidation, semisynthesis, and biological activities
作者:Wei-Xia Song、Yong-Chun Yang、Jian-Gong Shi
DOI:10.1016/j.cclet.2014.05.037
日期:2014.9
were isolated from an aqueous extract of the flower buds of Lonicera japonic a. Their uncommon structures including absolute configurations were determined by spectroscopic data analysis, and confirmed by semisynthesis from the co-occurring secologanin ( 3 ) and secologanic acid ( 4 ). Compounds 1 and 2 exhibited resistant activity against β -glucosidase from almonds and hesperidinase from Aspergillus
摘要从忍冬(Lonicera japonic a)的花蕾水提物中分离出了两种新的β-羟基氨基酸偶联的类香豆素,分别称为丝氨酸二硒精(1)和苏糖二硒精(2)。通过光谱数据分析确定了它们的不常见结构(包括绝对构型),并通过同时存在的secologanin(3)和secologanic酸(4)的半合成证实了它们的结构。化合物1和2对杏仁的β-葡萄糖苷酶和黑曲霉的橙皮苷酶均具有抗药性,它们还对由血小板活化因子诱导的大鼠多形核白细胞中的葡萄糖醛酸苷酶释放具有抑制作用,抑制率分别为(34.9±3.1)%和分别为(53.6±2.6)%。