A rapid and simple enzymatic transformation of the representative coumarin esculetin (1) with polyphenol oxidase originating from Agaricus bisporus afforded five new oxidized metabolites, esculetinins A (2), B (3), C (4), D (5), and E (6), together with the known compound isoeuphorbetin (7). The structures of the oligomerized transformation products were established on the basis of spectroscopic interpretations
代表性
香豆素七叶苷 ( 1 ) 与源自双孢蘑菇的多
酚氧化酶进行快速简单的酶促转化,得到五种新的氧化代谢物,
七叶苷 A ( 2 )、B ( 3 )、C ( 4 )、D ( 5 ) 和 E ( 6 ),连同已知化合物异
大黄素 ( 7 )。低聚转化产物的结构是在光谱解释的基础上建立的。
七叶亭低聚物2和3对 α-
葡萄糖苷酶具有高度增强的抑制活性,IC 为50与原始
七叶苷相比,值分别为 0.7 ± 0.1 和 2.3 ± 0.3μM。动力学分析还表明,两种新的强效代谢物2和3具有竞争作用模式。