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Occurrence of Stilbene Glucosides in Upuna borneensis

✍ Scribed by Tetsuro Ito; Zulfiqar Ali; Ibrahim Iliya; Miyuki Furusawa; Toshiyuki Tanaka; Ken-ichi Nakaya; Yoshikazu Takahashi; Ryuichi Sawa; Jin Murata; Dedy Darnaedi; Munekazu Iinuma

Publisher: John Wiley and Sons
Year: 2005
Tongue: German
Weight: 147 KB
Volume: 88
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.200490293

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✦ Synopsis

Abstract

Four new stilbene glucosides, upunosides A (1), B (5), C (6), and D (7), were isolated from the stem of Upuna borneensis (Dipterocarpaceae) together with the three known glucosides 3, 4, and 8. Upunoside A (1) is the first natural instance of a glucoside of a resveratrol pentamer, and its aglycone has a dibenzo‐fused bicyclo[5.3.0]octadiene and two dihydrobenzofuran moieties. The relative structure of the aglycone was determined by spectral analysis including 1D and 2D NMR experiments.

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