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1H and 13C NMR assignments for two anthraquinones and two xanthones from the mangrove fungus (ZSUH-36)

✍ Scribed by Changlun Shao; Zhigang She; Zhiyong Guo; Hong Peng; Xiaoling Cai; Shining Zhou; Yucheng Gu; Yongcheng Lin

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
217 KB
Volume
45
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

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.

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