Tannins and related compounds. XXXVIII. Isolation and characterization of flavan-3-ol glucosides and procyanidin oligomers from cassia bark (Cinnamomum cassia Blume).
作者:SATOSHI MORIMOTO、GEN-ICHIRO NONAKA、ITSUO NISHIOKA
DOI:10.1248/cpb.34.633
日期:——
A chemical examination of the bark of Cinnamomum cassia( ?? ?? ?? ?? : Lauraceae) has led to the isolation of three flavan-3-ol glucosides (1-3) and three oligomeric procyanidins (4-6) named cinnamtannins A2-A4, together with (-)-epicatechin(7), procyanidins B-2 (8), B-5 (9) and C-1 (11), and a doubly-linked proanthocyanidin (10). On the basis of chemical and spectroscopic evidence, compounds 1-3 were characterized as (-)-epicatechin 3-O-, 8-C- and 6-C-β-D-glucopyranosides, respectively, while compounds 4-6 were shown to be tetrameric, pentameric and hexameric procyanidins, respectively, consisting exclusively of (-)-epicatechin units linked linearly through C(4β)-C(8) bonds.
通过对肉桂树皮进行化学研究,分离出三种黄烷-3-醇葡糖苷(1-3)和三种低聚原花青素(4-6),分别命名为肉桂单宁 A2-A4,以及(-)-表儿茶素(7)、原花青素 B-2 (8)、B-5 (9)和 C-1 (11)和一种双链原花青素(10)。根据化学和光谱证据,化合物 1-3 的特征分别是(-)-表儿茶素 3-O-、8-C-和 6-C-β-D 吡喃葡萄糖苷,而化合物 4-6 则分别是四聚、五聚和六聚原花青素,完全由通过 C(4β)-C(8) 键线性连接的(-)-表儿茶素单元组成。