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1H and 13C NMR signal assignments of Paecilin A and B, two new chromone derivatives from mangrove endophytic fungus Paecilomyces sp. (tree 1–7)

✍ Scribed by Zhiyong Guo; Zhigang She; Changlun Shao; Lu Wen; Fan Liu; Zhonghui Zheng; Yongcheng Lin

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

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✦ Synopsis

Abstract

Two new natural products, named paecilin A (1) and B (2), together with two known compounds secalonic acid D (3) and (11)‐cytochalasa‐6(12),13‐diene‐1,21‐dione‐16,18‐dimethyl‐7‐hydroxy‐l0‐phenyl‐(7__S__*,13__E__,16__S__*,18__S__*) (4), were isolated from the mangrove endophytic fungus, Paecilomyces sp. (tree 1–7) from the South China Sea. 1D and 2D NMR experiments including COSY, HMQC, and HMBC were used for the determination of their structures. In our cytotoxicity assays, secalonic D (3) showed cytotoxicity toward KB cells with IC~50~ < 1 µg ml^−1^ and inhibiting human topoisomerase I with IC~50~ at 0.16 µmol ml^−1^. 1, 2, and 4 showed no activity to KB cells. Copyright © 2007 John Wiley & Sons, Ltd.

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