Divaccinosides A–D,four rare iridoid glucosidic truxillate esters from the leaves of Vaccinium bracteatum |
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| Authors: | Yong-Mei Ren Chang-Qiang Ke Chunping Tang Sheng Yao Yang Ye |
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| Institution: | 1. State Key Laboratory of Drug Research, and Natural Products Chemistry Department, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China;2. School of Life Science and Technology, ShanghaiTech University, Shanghai 201203, China;3. University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China |
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| Abstract: | Divaccinosides A–D (1–4), four rare iridoid glucoside cyclodimers in the truxillate forms, were characterized from the leaves of Vaccinium bracteatum. They were presumably biosynthesized from two known iridoid glucoside monomers, vaccinoside (5) and 10-O-trans-p-coumaroyl-6α-hydroxyl-dihydromonotropein (6), via a 2+2] cycloaddition reaction. The structures of the new compounds were established by comprehensive spectroscopic measurements, combined with chemical conversions and single crystal X-ray crystallographic analyses. |
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| Keywords: | Ericaceae Iridoid glucosides Divaccinosides [2+2] cycloaddition |
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