Dimeric flavans from gambir and their structural correlations with (+)-catechin

Shoko Taniguchi, Kayo Kuroda, Kou ichi Doi, Masahiro Tanabe, Takashi Shibata, Takashi Yoshida, Tsutomu Hatano

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We isolated two new flavan dimers, gambirflavan D3 (10) and gambirflavan D4 (12), together with gambiriin A3 (11), from gambir, a hot-water extract of the leaves and young twigs of Uncaria gambir. Because their spectral analyses suggested that they are derived from catechin, we conducted a conversion reaction using (+)-catechin (1) to produce these dimers; another new flavan, gambirflavan D5 (13), was obtained as a product of this reaction. The structural relationship of these dimeric flavans with (+)-catechin (1) is discussed.

Original languageEnglish
Pages (from-to)1171-1180
Number of pages10
JournalHeterocycles
Volume76
Issue number2
DOIs
Publication statusPublished - Nov 1 2008

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Catechin
Dimers
Uncaria
Conversion Disorder
Water

Keywords

  • Catechin
  • Condensed Tannin
  • Dimeric Flavan
  • Gambir
  • Uncaria gambir

ASJC Scopus subject areas

  • Analytical Chemistry
  • Organic Chemistry
  • Pharmacology

Cite this

Dimeric flavans from gambir and their structural correlations with (+)-catechin. / Taniguchi, Shoko; Kuroda, Kayo; Doi, Kou ichi; Tanabe, Masahiro; Shibata, Takashi; Yoshida, Takashi; Hatano, Tsutomu.

In: Heterocycles, Vol. 76, No. 2, 01.11.2008, p. 1171-1180.

Research output: Contribution to journalArticle

Taniguchi, Shoko ; Kuroda, Kayo ; Doi, Kou ichi ; Tanabe, Masahiro ; Shibata, Takashi ; Yoshida, Takashi ; Hatano, Tsutomu. / Dimeric flavans from gambir and their structural correlations with (+)-catechin. In: Heterocycles. 2008 ; Vol. 76, No. 2. pp. 1171-1180.
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