Abstract
Two C-glucosides of resveratrol dimers (uliginoside A ( 1) and hemsleyanoloside B ( 2)) consisting of enantiomeric aglycones and two C-glucosides of resveratrol trimers (uliginosides B ( 3) and C ( 4)) consisting of diastereomeric aglycones were isolated from Shorea uliginosa (Dipterocarpaceae). These structures were elucidated by spectroscopic analysis including NMR experiments, and their absolute configurations were determined based on circular dichroism data. Resveratrol oligomers of C-glucosides with a 1,2-diaryldihydrobenzofuran ring are produced with specific biogenetic routes.
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