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  • Title: Yezo'otogirins D-H, Acylphloroglucinols and Meroterpenes from Hypericum yezoense.
    Author: Tanaka N, Tsuji E, Kashiwada Y, Kobayashi J.
    Journal: Chem Pharm Bull (Tokyo); 2016; 64(7):991-5. PubMed ID: 27373661.
    Abstract:
    Investigation of the methanolic extract from the aerial parts of Hypericum yezoense resulted in the isolation of three new acylphloroglucinols, yezo'otogirins D-F (1-3), and two new meroterpenes, yezo'otogirins G (4) and H (5). The structures of 1-5 were assigned on the basis of spectroscopic data. Yezo'otogirin D (1) is an acylphloroglucinol with a monoterpene moiety linked through an ether bond, while yezo'otogirins E (2) and F (3) are polyprenylated acylphloroglucinols possessing a tricyclic core. Yezo'otogirins G (4) and H (5) are linear meroterpenes with an enolized β-diketone moiety. Yezo'otogirin E (2) exhibited antimicrobial activity against Escherichia coli and Staphylococcus aureus.
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