Dimeric and trimeric hydrolyzable tannins from Quercus coccifera and Quercus suber |
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Authors: | Ito Hideyuki Yamaguchi Koji Kim Tae-Hoon Khennouf Seddik Gharzouli Kamel Yoshida Takashi |
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Institution: | Faculty of Pharmaceutical Sciences, Okayama University, Tsushima, Okayama, 700-8530, Japan. |
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Abstract: | Three new hydrolyzable tannins, cocciferins D(1) (1), D(2) (2), and T(1) (4), were isolated from the leaves of Quercus coccifera. Cocciferin D(2) (2) and two additional new tannins, cocciferins D(3) (3) and T(2) (5), were also obtained from the leaves of Quercus suber. Their oligomeric structures were elucidated on the basis of spectroscopic methods and chemical evidence. Compounds 2, 3, and 5 were rare oligomers possessing glucose cores with both open-chain and pyranose forms. |
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