Revised Structures of Gambiriins A1, A2, B1, and B2, Chalcane-Flavan Dimers from Gambir (Uncaria gambir Extract)
作者:Shoko Taniguchi、Kayo Kuroda、Kou-ichi Doi、Masahiro Tanabe、Takashi Shibata、Takashi Yoshida、Tsutomu Hatano
DOI:10.1248/cpb.55.268
日期:——
Gambir, the aqueous extract from Uncaria gambir (Rubiaceae), has been used as an astringent medicine in Asian countries. Investigation of the constituents in the extract led to the isolation of four chalcane-flavan dimers, gambiriin A1 (6), A2 (7), B1 (8), and B2 (9), in addition to (+)-catechin (1), (+)-epicatechin (2), and dimeric proanthocyanidins, procyanidin B1 (3), procyanidin B3 (4), and gambiriin C (5). The spectroscopic and chemical data obtained in the present study indicated that their previously proposed structures 6a, 7a, 8a, and 9a should be revised to 6, 7, 8, and 9, respectively.
钩藤属植物钩藤(茜草科)的水提取物钩藤碱,在亚洲国家被用作收敛剂药物。对该提取物成分的调查导致分离得到四种查尔烷-黄烷二聚体,即钩藤碱A1(6)、A2(7)、B1(8)和B2(9),以及(+)-儿茶素(1)、(+)-表儿茶素(2)和二聚原花青素,原花青素B1(3)、原花青素B3(4)和钩藤碱C(5)。本研究获得的波谱和化学数据表明,它们之前提出的结构6a、7a、8a和9a应分别修订为6、7、8和9。