Journal
CHEMICAL & PHARMACEUTICAL BULLETIN
Volume 55, Issue 2, Pages 268-272Publisher
PHARMACEUTICAL SOC JAPAN
DOI: 10.1248/cpb.55.268
Keywords
gambir; Uncaria gambir; chalcane-flavan dimer; catechin; gambiriin
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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), 131 (8), and B2 (9), in addition to (+)-catechin (1), (+)-epicatechin (2), and dimeric proanthocyanidins, procyanidin 131 (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.
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