(+)-gallocatechin-(4α->8')-epigallocatechin | 68964-95-4

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 黄酮类化合物
• 英文名称: (+)-gallocatechin-(4α->8')-epigallocatechin
• 英文别名: gallocatechin-(4α→8)-epigallocatechin；gallocatechin(4α->8)epigalocatechin；gallocatechin-(4α,8)-epigallocatechin；gallocatechin-(4α-8)-epigallocatechin；prodelphinidin B-4；prodelphinidin B4；Gallocatechin-(4alpha->8)-epigallocatechin；(2R,3R)-2-(3,4,5-trihydroxyphenyl)-8-[(2R,3S,4S)-3,5,7-trihydroxy-2-(3,4,5-trihydroxyphenyl)-3,4-dihydro-2H-chromen-4-yl]-3,4-dihydro-2H-chromene-3,5,7-triol
• CAS: 68964-95-4
• 化学式: C₃₀H₂₆O₁₄
• 分子量: 610.528
• InChiKey: RTEDIEITOBJPNI-MMKMIGCXSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.7
• 重原子数：
  44
• 可旋转键数：
  3
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.2
• 拓扑面积：
  261
• 氢给体数：
  12
• 氢受体数：
  14

反应信息

• 作为反应物：
  描述：

  乙酸酐 、 (+)-gallocatechin-(4α->8')-epigallocatechin 在 吡啶 、 4-二甲氨基吡啶 作用下， 以27%的产率得到gallocatechin-(4β->8)-epigallocatechin peracetate
  参考文献：
  名称：

  Syntheses of prodelphinidin B1, B2, and B4 and their antitumor activities against human PC-3 prostate cancer cell lines

  摘要：

  Total synthesis of prodelphinidin B1, B2, and B4 has been accomplished. The key step is Lewis acid-mediated equimolar condensations between an epigallocatechin and/or a gallocatechin nucleophile and an epigallocatechin and/or a gallocatechin electrophile. The antitumor effects of synthetic prodelphinidin B1-B4 against human PC-3 prostate cancer cell lines have been investigated. These compounds showed significant antitumor effects. Their activity seemed to be little bit stronger than EGCG and prodelphinidin B3, known antitumor agent. (C) 2013 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetlet.2013.10.113
• 作为产物：
  描述：

  [4,8’]-2,3-trans-3.4-trans:2’,3’-cis-decabenzyloxy-(+)-gallocatechin-(-)-epigallocatechin 在 20% palladium hydroxide-activated charcoal 、 氢气 作用下， 以 四氢呋喃 、 甲醇 、 水 为溶剂， 反应 4.0h， 以100%的产率得到(+)-gallocatechin-(4α->8')-epigallocatechin
  参考文献：
  名称：

  Syntheses of prodelphinidin B1, B2, and B4 and their antitumor activities against human PC-3 prostate cancer cell lines

  摘要：

  Total synthesis of prodelphinidin B1, B2, and B4 has been accomplished. The key step is Lewis acid-mediated equimolar condensations between an epigallocatechin and/or a gallocatechin nucleophile and an epigallocatechin and/or a gallocatechin electrophile. The antitumor effects of synthetic prodelphinidin B1-B4 against human PC-3 prostate cancer cell lines have been investigated. These compounds showed significant antitumor effects. Their activity seemed to be little bit stronger than EGCG and prodelphinidin B3, known antitumor agent. (C) 2013 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetlet.2013.10.113

文献信息

• Tannins and related compounds. XC. 8-C-ascorbyl (-)-epigallocatechin 3-O-gallate and novel dimeric flavan-3-ols, oolonghomobisflavans A and B, from oolong tea.(3).
  作者：Fumio HASHIMOTO、Gen-ichiro NONAKA、Itsuo NISHIOKA

  DOI：10.1248/cpb.37.3255

  日期：——

  A chemical examination of the polypenolic constituents in commercial oolong tea has led to the isolation of a new-flavan-3-ol, two novel dimeric flavan-3-ols named oolonghomobisflavans A and B eight new proanthocyanidins, together with twenty-one known polyphenols including proanthocyanidins, hydrolyzable tannins and red pigments. On the basis of chemical and spectroscopic evidence, the flavan-3-ol has been characterized as 8-C-ascorbyl (-)-epigallocatechin 3-O-gallate (22), while oolonghomobisflavans A (26) and B (27) have been determined to be dimeric flavan-3-ols in which two units are linked through a methylene bridge at the 8, 8'- and 8, 6'-positions, respectively. The structures of the new proanthocyanidins were elucidated mainly by tannase hydrolysis and thiolytic degradtion as epicatechin-(4β→8)-epigallocatechin 3-O-gallate (29), epicatechin 3-O-gallate-(4β→8)-epigallocatechin 3-O-gallate (30), catechin-(4α→8)-epigallocatechin 3-O-gallate (31), prodelphinidin B-4 3'-O-gallate (32), epicatechin 3-O-gallate-(4β→6)-epigallocatechin 3-O-gallate (33), epigallocatechin 3-O-gallate-(4β→6)-epicatechin 3-O-gallate (34), epiafzelechin 3-O-gallate-(4β→6)-epigallocatechin 3-O-gallate (35) and prodelphinidin B-2 3'-O-gallate (36).

  对商业乌龙茶中的多酚成分进行化学检查，导致了一种新的黄烷-3-醇的分离，两个新型的二聚黄烷-3-醇被命名为乌龙双黄烷 A 和 B，以及八种新的原花青素，并与二十一种已知的多酚类物质包括原花青素、水解单宁和红色素一同发现。根据化学和光谱证据，该黄烷-3-醇被表征为8-C-抗坏血酸 (-)-表没食子酸-3-O-没食子酸酯（22），而乌龙双黄烷 A（26）和 B（27）被确定为二聚黄烷-3-醇，其中两个单元通过甲撑桥分别在8, 8'-和8, 6'-位连接。新的原花青素的结构主要通过单宁酶水解和硫解降解阐明，分别为表没食子酸-(4β→8)-表没食子酸-3-O-没食子酸酯（29）、表没食子酸-3-O-没食子酸酯-(4β→8)-表没食子酸-3-O-没食子酸酯（30）、儿茶素-(4α→8)-表没食子酸-3-O-没食子酸酯（31）、前南梅素 B-4 3'-O-没食子酸酯（32）、表没食子酸-3-O-没食子酸酯-(4β→6)-表没食子酸-3-O-没食子酸酯（33）、表没食子酸-3-O-没食子酸酯-(4β→6)-表没食子酸-3-O-没食子酸酯（34）、表阿伏塞黑素-3-O-没食子酸酯-(4β→6)-表没食子酸-3-O-没食子酸酯（35）和前南梅素 B-2 3'-O-没食子酸酯（36）。