New resveratrol tetramers from the stem bark of Upuna borneensis |
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Authors: | Ito Tetsuro Ali Zulfiqar Furusawa Miyuki Iliya Ibrahim Tanaka Toshiyuki Nakaya Ken-ichi Murata Jin Darnaedi Dedy Oyama Masayoshi Iinuma Munekazu |
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Affiliation: | Gifu Prefectural Institute of Health and Environmental Sciences, 1-1 Naka-fudogaoka, Kakamigahara 504-0838, Japan. zvn00510@nifty.ne.jp |
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Abstract: | Five new resveratrol (=5-[(E)-2-(4-hydroxyphenyl)ethenyl]benzene-1,3-diol) tetramers, upunaphenols H-J (1-3) and trans-(4) and cis-upunaphenol K (5), were isolated from the stem of Upuna borneensis (Dipterocarpaceae). Their structures were elucidated on the basis of 1D- and 2D-NMR as well as FAB-MS data. Compounds 1-3 bear a rare biphenyl bond in their frameworks. Compounds 1 and 2 have an unprecedented nonacyclic fused ring system, and compounds 2 and 3 have symmetrical structures. |
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