Tannins of Coriaria japonica A. GRAY. III. Structures of coriariins G, H, I and J

Tsutomu HATANO; Rieko YOSHIHARA; Shin HATTORI; Masao YOSHIZAKI; Tetsuro SHINGU; Takuo OKUDA

doi:10.1248/cpb.40.1703

Tsutomu HATANO, Rieko YOSHIHARA, Shin HATTORI, Masao YOSHIZAKI, Tetsuro SHINGU, Takuo OKUDA

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Keywords: tannin, hydrolyzable tannin, coriariin G, coriariin H, coriariin I, coriariin J, Coriaria japonica, sedoheptulose, depsidone, dehydrodigalloyl group

JOURNAL FREE ACCESS

1992 Volume 40 Issue 7 Pages 1703-1710

DOI https://doi.org/10.1248/cpb.40.1703

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Abstract

For new hydrolyzable tannins, coriariins G, H, I and J. were isolated from the leaf of Coriaria japonica (Coriariaceae). Structures 1, 2 and 3, having a sedoheptulose residue, were assigned for coriariins G, H and I, respectively. Structure 4, having a depsidone-forming dehydrodigalloyl group, was assigned for coriariin J, based on the chemical correlation with coriariin B (5). The orientation of the dehydrodigalloyl group in 5 was confirmed by ¹H-¹³C long-range shift-correlation spectroscopy.

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