Structures of Alnusiin and Bicornin, New Hydrolyzable Tannins Having a Monolactonized Tergalloyl Group

Abstract

From the fruit extract of Alnus sieboldiana, a new hydrolyzable tannin, alnusiin (1), was isolated together with five known tannins : tellimagrandin I (6), pedunculagin (7), casuarinin (9), casuariin (10) and 2,3-O-(S)-hexahydroxydiphenoyl-D-glucose (11). The structure (1) of alnusiin in which a monolactonized tergalloyl group, a rare component unit, bonds to the glucose residue, was elucidated based on spectral analyses including ^1H-^<13>C long-range shift correlation spectroscopy, and chemical methods. Another new hydrolyzable tannin with a related structure, bicornin (21), and six known galloylglucoses as well as six ellagitannins (including oligomers), were isolated from Trapa bicornis fruits and their structures were characterized.

Journal

Chemical & pharmaceutical bulletin   [List of Volumes]

Chemical & pharmaceutical bulletin 37(10), 2655-2660, 1989-10-25  [Table of Contents]

The Pharmaceutical Society of Japan

Cited by:  2

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Codes

  • NII Article ID (NAID) :
    110003627299
  • NII NACSIS-CAT ID (NCID) :
    AA00602100
  • Text Lang :
    ENG
  • Article Type :
    Journal Article
  • ISSN :
    00092363
  • Databases :
    CJPref  NII-ELS 

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