Two benzophenone O-arabinosides and a chromone from Hypericum annulatum

Add time:08/27/2019    Source:sciencedirect.com

Two benzophenone O-arabinosides, annulatophenonoside (1) and acetylannulatophenonoside (2) were isolated from the methanol extract of the herb of Hypericum annulatum. The structures of the benzophenones were established as 2-O-α-l-arabinofuranosyl-3′,5′,6-trihydroxy-4-methoxybenzophenone (1) and 2-O-α-l-3″-acetylarabinofuranosyl-3′,5′,6-trihydroxy-4-methoxybenzophenone (2) based on spectral and chemical evidence. A chromone, 5,7-dihydroxy-3-methylchromone (3) was isolated from the chloroform extract. Although it has been previously synthesized it is encountered in a plant source for the first time. Co-occurrence of the two new benzophenone O-arabinosides along with the biogenetically related 1,5,7-trihydroxy-3-methoxyxanthone was not found.

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