(10R,11S). The preparation of 2,3-dehydrosilychristin (4) was optimized. The Folin–Ciocalteau reduction and DPPH and ABTS radical scavenging assays revealed silychristin and its analogues to be powerful antioxidants, which were found to be more potent than silybin and 2,3-dehydrosilybin. Compounds 4–6 exhibited inhibition of microsomal lipoperoxidation (IC50 4–6 μM). Moreover, compounds 4–8 were found
水飞蓟素是在
水飞蓟果实中含量第二高的黄素
木脂素(仅次于
水飞蓟宾)。A组包含
水飞蓟亭(化合物3)及其衍
生物,例如2,3- dehydrosilychristin(4),2,3- dehydroanhydrosilychristin(5),anhydrosilychristin(6),silyhermin(7),和isosilychristin(8)进行了研究。比较了以高分辨率获得的这些化合物的理化数据。有人认为silyhermin(7)的绝对构型与D环(10 R,11 S)中的silychristin A(3a)相同。)。优化了2,3-脱氢
硅水杨苷(4)的制备。Folin–Ciocalteau还原以及
DPPH和
ABTS自由基清除测定表明
水飞蓟素及其类似物是强大的
抗氧化剂,被发现比
水飞蓟宾和2,3-脱氢
水飞蓟宾更有效。化合物4 – 6表现出对微粒体脂质过氧化的抑制作用(IC 50 4–6μM)。此外,化合物4