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Dibenzocyclooctadiene-type lignans fromMagnolia pyramidata

Authors
Journal
Phytochemistry
0031-9422
Publisher
Elsevier
Publication Date
Volume
55
Issue
6
Identifiers
DOI: 10.1016/s0031-9422(00)00234-x
Keywords
  • Magnolia Pyramidata
  • Magnoliaceae
  • Dibenzocyclooctadiene-Type Lignans
  • Pyramidatins A–H

Abstract

Abstract Eight dibenzocyclooctadiene-type lignans, pyramidatin A–H, were isolated from the leaves of Magnolia pyramidata. Their structures were established by spectral methods, mainly 2D NMR spectroscopic techniques, which involved combined applications of COSY, DEPT, 1H, 13C correlations, COLOC, INAPT and long-range inverse 1H, 13C NMR correlations. The molecular structures of pyramidatin A and B were determined by single crystal X-ray diffraction. The absolute configurations of all eight lignans were derived from CD spectral correlations with structurally related dibenzocyclooctadienes of known absolute configuration.

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