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Paper | Special issue | Vol 74, No. 1, 2007, pp.595-605
Published online, 16th October, 2007
DOI: 10.3987/COM-07-S(W)37
New Dimeric Flavans from Gambir, an Extract of Uncaria gambir

Shoko Taniguchi, Kayo Kuroda, Naomi Yoshikado, Kou-ichi Doi, Masahiro Tanabe, Takashi Shibata, Takashi Yoshida, and Tsutomu Hatano*

*Faculty of Pharmaceutical Science, Okayama University, 1-1-1 Tsushima-naka, Okayama 700-8530, Japan

Abstract

Three new dimeric flavans, catechin-(4α→8)-ent-epicatechin (7), gambirflavan D1 (8), and gambirflavan D2 (9), were isolated from gambir (an extract from the leaves and young twigs of Uncaria gambir), and their structures were determined based on spectroscopic and chemical data.