2008/06/13 by Shan He, Bin Wu, Yuanjiang Pan +1 · 2 citations
Medicine · Biochemistry, Genetics and Molecular Biology · #Sirtuins and Resveratrol in Medicine #Biological and pharmacological studies of plants #Plant biochemistry and biosynthesis
paper · doi:10.1021/jo8001112
openalex publication_date 2008/06/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/26
Five new stilbene oligomers, laetevirenol A-E (4-8), were isolated from Parthenocissus laetevirens, together with three known stilbene oligomers (2, 3, and 9). The structures of the new compounds were elucidated by spectroscopic analysis, including 1D and 2D NMR experiments. Afterward the absolute configurations were determined. Biomimetic transformations revealed a possible biogenetic route, where stilbene trimers were enzymatically synthesized for the first time. In addition, their antioxidant activities were evaluated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. The results showed that stilbene oligomers with an unusual phenanthrene moiety exhibited much stronger antioxidant activities. Thus, the photocatalyzed cyclization of stilbenes was supposed to be an antioxidant activity promoting transformation, which was hypothesized to play a role in the antioxidative defense system of the plant.