Two New Resveratrol (=5-[(1E)-2-(4-Hydroxyphenyl)ethenyl]benzene-1,3-diol) Tetramers with a Tetrahydrofuran Ring from Dipterocarpus grandiflorus
✍ Scribed by Tetsuro Ito; Toshiyuki Tanaka; Munekazu Iinuma; Ken-ichi Nakaya; Yoshikazu Takahashi; Ryuichi Sawa; Jin Murata; Dedy Darnaedi
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- German
- Weight
- 430 KB
- Volume
- 87
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Two new stilbene tetramers, grandiphenols A (1) and B (2), along with ten known stilbene oligomers and bergenin were isolated from the stem of Dipterocarpus grandiflorus. The structures of 1 and 2 composed of four resveratrol (=5‐[(1__E__)‐2‐(4‐hydroxyphenyl)ethenyl]benzene‐1,3‐diol) units had eight asymmetric C‐atoms in the partial structures of a tetrahydrofuran and two dihydrobenzofuran moieties. Detailed spectroscopic analyses, especially HMBC and NOESY experiments, allowed to differentiate the configurations of 1 and 2.