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Org Lett. 2014 Mar 7;16(5):1378-81. doi: 10.1021/ol500146a. Epub 2014 Feb 24.

New metabolites of C-glycosidic ellagitannin from Japanese oak sapwood.

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1
Graduate School of Biomedical Sciences, Nagasaki University , 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.

Abstract

Two unusual ellagitannin metabolites, quercusnins A (3) and B (4), have been isolated from the sapwood of Quercus crispula, and their structures determined by spectroscopic methods, as well as DFT calculations of (1)H and (13)C NMR chemical shifts of the possible four diastereomers. Treatment of the major ellagitannin species, vescalagin, with Shiitake mushroom (Lentinula edodes) gave 3, which indicated that these unique ellagitannins were the fungal metabolites of ellagitannins.

PMID:
24564450
DOI:
10.1021/ol500146a
[Indexed for MEDLINE]
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