New acylated flavonol glucosides in Allium tuberosum Rottler.
作者:TAKATOSHI YOSHIDA、TAKASHI SAITO、SHIZUO KADOYA
DOI:10.1248/cpb.35.97
日期:——
Six flavonoids (1-6) were isolated from the leaves of Allium tuberosum ROTTLER (Liliaceae). Their structures were characterized as 3-Ο-β-sophorosyl-7-Ο-β-D- (2-Ο-feruloyl) glucosylkaempferol (1), 3, 4'-di-Ο-β-D-glucosyl-7-Ο-β-D- (2-Ο-feruloyl) glucosylkaempferol (2), 3-Ο-β-D- (2-Ο-feruloyl) -glucosyl-7, 4'-di-Ο-β-D-glucosylkaempferol (3), 3, 4'-di-Ο-β-D-glucosylkaempferol (4), 3, 4'-di-Ο-β-D-glucosylquercetin (5) and 3-Ο-β-sophorosylkaempferol (6) by examination of their physicochemical properties. On partial acid hydrolysis, 1 gave 7-Ο-β-D- (2-Ο-feruloyl) glucosylkaempferol (10), and on enzymatic hydrolysis, 1 and 3 afforded 3-Ο-β-D-glucosyl-7-Ο-β-D- (2-Ο-feruloyl) -glucosylkaempferol (11) and 3-Ο-β-D- (2-Ο-feruloyl) glucosylkaempferol (14), respectively. At pH 7.0 or at pH 11.0, or both, the 2-Ο-feruloyl group of 1, 2, 10 and 11 migrated to give the corresponding 6-Ο-feruloyl derivatives (15, 17, 16 and 18). Compounds 1-3 and their derivatives 10, 11, 14, 15, 16, 17 and 18 are new acylated flavonol glucosides.
从百合科植物 Allium tuberosum ROTTLER 的叶片中分离出六种黄酮类化合物(1-6)。它们的结构特征为 3-Ο-β-sophorosyl-7-Ο-β-D- (2-Ο-feruloyl) glucosylkaempferol (1)、3、4'-二-Ο-β-D-葡萄糖基-7-Ο-β-D-(2-Ο-阿魏酰)葡萄糖基山奈酚(2)、3-Ο-β-D-(2-Ο-阿魏酰)-葡萄糖基-7、在部分酸水解过程中,1, 4'-二-Ο-β-D-葡糖基山奈酚(3)、3, 4'-二-Ο-β-D-葡糖基山奈酚(4)、3, 4'-二-Ο-β-D-葡糖基槲皮素(5)和 3-Ο-β-槐糖基山奈酚(6)的理化性质受到检测。在部分酸水解过程中,1 得到了 7-Ο-β-D- (2-Ο-feruloyl) 葡糖基莰菲醇(10);在酶水解过程中,1 和 3 得到了 3-Ο-β-D- (2-Ο-feruloyl) 葡糖基莰菲醇(10)、1 和 3 分别得到 3-Ο-β-D- 葡糖基-7-Ο-β-D-(2-Ο-阿魏酰基)-葡糖基莰菲醇(11)和 3-Ο-β-D- (2-Ο-阿魏酰基)葡糖基莰菲醇(14)。在 pH 值为 7.0 或 pH 值为 11.0 时,或同时在这两种条件下,1、2、10 和 11 的 2-Ο-feruloyl 基团发生迁移,生成相应的 6-Ο-feruloyl 衍生物(15、17、16 和 18)。化合物 1-3 及其衍生物 10、11、14、15、16、17 和 18 是新的酰化黄酮醇葡萄糖苷。