Tannins and related compounds. XXXIX. Procyanidin C-glucosides and an acylated flavan-3-ol glucoside from the barks of Cinnamomum cassia Blume and C. obtusifolium Nees.
作者:SATOSHI MORIMOTO、GEN-ICHIRO NONAKA、ITSUO NISHIOKA
DOI:10.1248/cpb.34.643
日期:——
Along with procyanidins B-1 (4), B-2 (5), B-5 (6) and B-7 (7), and the doubly linked proanthocyanidin, A-2 (8), two new procyanidin glucosides have been isolated from the bark of Cinnamomum cassia BLUME( ?? ?? ?? ?? )(Lauraceae), and characterized as procyanidin B-2 8-C- and 6-C-β-D-glucopyranosides (1 and 2, respectively) on the basis of proton and carbon-13 nuclear magnetic resonance examinations and the results of thiolytic degradation. In addition, from the bark of Cinnamomum obtusifolium NEES( ?? ?? ?? ?? ?? ?? ), an acylated flavan-3-ol glucoside (3) has been isolated, together with the known proanthocyanidins B-1 (4), B-2 (5), B-5 (6) and A-2 (8). The structure of 3 has been established to be (+)-catechin 5-O-β-D-(2"-O-feruloyl-6"-O-p-coumaroyl)-glucopyranoside on the basis of chemical and spectral evidence.
除了原花青素 B-1 (4)、B-2 (5)、B-5 (6)和 B-7 (7)以及双链原花青素 A-2 (8)之外,还从肉桂 Cinnamomumum cassia BLUME( ?? ?? ?? ?? )( 月桂科)树皮中分离出两种新的原花青素葡萄糖苷,并根据核碳-13 磁性原花青素 B-2 8-C- 和 6-C-β-D-Glucopyranosides (1 和 2)的特征,将其分别命名为原花青素 B-2 8-C- 和 6-C-β-D-Glucopyranosides (1和2)。) (Lauraceae) 树皮中分离出了两种新的原花青素苷,并根据质子和碳 13 核磁共振检测以及硫代降解的结果,将其分别定性为原花青素 B-2 8-C- 和 6-C-β-D-Glucopyranosides (1 和 2)。此外,还从肉桂(Cinnamomum obtusifolium NEES)树皮中分离出一种酰化黄烷-3-醇葡萄糖苷(3),以及已知的原花青素 B-1(4)、B-2(5)、B-5(6)和 A-2(8)。根据化学和光谱证据,3 的结构被确定为 (+)-catechin 5-O-β-D-(2"-O-feruloyl-6"-O-p-coumaroyl)-glucopyranoside 。