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1 H and 13 C NMR assignments for two anthraquinones and two xanthones from the mangrove fungus (ZSUH‐36)
Author(s) -
Shao Changlun,
She Zhigang,
Guo Zhiyong,
Peng Hong,
Cai Xiaoling,
Zhou Shining,
Gu Yucheng,
Lin Yongcheng
Publication year - 2007
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1974
Subject(s) - chemistry , anthraquinones , mangrove , fungus , carbon 13 nmr , nuclear magnetic resonance spectroscopy , stereochemistry , botany , ecology , biology
We report the unambiguous assignments of the 1 H and 13 C NMR spectra of one new natural product, namely, 6,8‐di‐O‐methyl versiconol (1) together with one known anthraquinone aversin (2) and two xanthones 5‐methoxysterigmatocystin (3) and sterigmatocystin (4). These compounds were all isolated from the mangrove endophytic fungus ZSUH‐36 from the South China Sea. 1D and 2D NMR experiments including COSY, HMQC and HMBC were used to elucidate the structures. Variations in the 1 H NMR spectrum of 6,8‐di‐O‐methyl versiconol (1) were also observed in the temperature range 25–75 °C. In addition, the plausible biogenetic path from 1 to 2 is discussed. Copyright © 2007 John Wiley & Sons, Ltd.