1H and 13C NMR assignments for two anthraquinones and two xanthones from the mangrove fungus (ZSUH-36).
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 degrees C. In addition, the plausible biogenetic path from 1 to 2 is discussed.
Shao
Changlun
C
School of Chemistry and Chemical Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
She
Zhigang
Z
Guo
Zhiyong
Z
Peng
Hong
H
Cai
Xiaoling
X
Zhou
Shining
S
Gu
Yucheng
Y
Lin
Yongcheng
Y
D000880:Anthraquinones / Q000737:chemistry*; D002247:Carbon Isotopes; D002681:China; D005658:Fungi / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009792:Oceans and Seas; D011522:Protons; D044004:Xanthones / Q000737:chemistry*
C521458:6,8-di-O-methyl versiconol; D000880:Anthraquinones; D002247:Carbon Isotopes; D011522:Protons; D044004:Xanthones; C521459:aversin