Tannins and Related Compounds. CXVI. Six New Complex Tannins, Guajavins, Psidinins and Psiguavin from the Bark of Psidium guajava L.

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Six new complex tannins, guajavins A (5) and B (1), psidinins A (9), B (11) and C (13), and psiguavin (15), together with a variety of condensed, hydrolyzable and complex tannins, have been isolated from the bark of Psidium guajava L. (Myrtaceae). On the basis of chemical and spectroscopic evidence, the structures of guajavins and psidinins were established to consist of a (+)-gallocatechin unit and a hydrolyzable tannin moiety linked C-glycosidically, while psiguavin was found to be a novel metabolite probably derived from eugenigrandin A (7) through successive oxidation, benzylic acid-type rearrangement, decarboxylation and oxidative coupling of the gallocatechin B-ring and one of the aromatic rings in the hydrolyzable tannin moiety.

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  • Chem. Pharm. Bull.

    Chem. Pharm. Bull. 40 2092-2098, 1992

    公益社団法人日本薬学会

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詳細情報 詳細情報について

  • CRID
    1573950402114329728
  • NII論文ID
    110003630156
  • NII書誌ID
    AA00602100
  • ISSN
    00092363
  • 本文言語コード
    en
  • データソース種別
    • CiNii Articles

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