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1H and 13C NMR assignments for five anthraquinones from the mangrove endophytic fungus Halorosellinia sp. (No. 1403)

✍ Scribed by Xue-Kui Xia; Hua-Rong Huang; Zhi-Gang She; Chang-Lun Shao; Fan Liu; Xiao-Ling Cai; L. L. P. Vrijmoed; Yong-Cheng Lin

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
139 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 two new natural products, namely, 1,4,5,6,7,9‐hexahydroxy‐2‐methoxy‐7‐methyl‐5β,9β,8aβ, 6α,10aα‐hexahydroanthracen‐10 (10aH)‐one (1) and 1,4,6‐trihydroxy‐2‐methoxy‐7‐methylanthracene‐9, 10‐dione (2), together with three known anthraquinones. These compounds were all isolated from the marine endophytic fungus No. 1403 collected from the South China Sea. Compounds 3 and 4 were isolated from the marine fungus for the first time. The structures were elucidated by the spectroscopic methods 1D and 2D NMR including COSY, HMQC, HMBC and NOE, and HREIMS. In our cytotoxicity assays, compound 5 showed cytotoxicity toward KB and KBv‐200 cells with IC~50~ of 1.40 and 2.58 µg/ml, respectively. In addition, the plausible biogenic relationship of compounds 1, 2, 3 and 4 is discussed. Copyright © 2007 John Wiley & Sons, Ltd.

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