title: Structure elucidation and NMR assignments for two xanthone derivatives from a mangrove endophytic fungus (No. ZH19).
abstract: The structure elucidations and complete (1)H and (13)C NMR assignments are reported for two new xanthone derivatives: 1,7-dihydroxy-2-methoxy-3-(3-methylbut-2-enyl)-9H-xanthen-9-one (1) and 1-hydroxy-4,7-dimethoxy-6-(3-oxobutyl)-9H-xanthen-9-one (2). Both of these secondary metabolites were isolated from the fermentation medium of a mangrove endophytic fungus (No. ZH19). High-resolution electron impact mass spectrometry (HREIMS), Fourier transform infrared (FT-IR) absorption spectrometry, and NMR experiments including gCOSY, gHMQC, and gHMBC were used for the determination of the structures and NMR spectral assignments. Preliminary pharmacological test showed that compounds (1) and (2) inhibited KB cells with IC(50) values of 20 and 35 micromol/ml, and KB(V)200 cells with IC(50) values of 30 and 41 micromol/ml, respectively.
authors.affiliation: College of Chemistry and Ecology Engineering, Guangxi University for Nationalities, Nanning 530006, P. R. China. zhongjinghuang@yahoo.cn
authors.forename: Zhongjing
authors.initials: Z
authors.lastname: Huang
authors.forename: Ruiyun
authors.initials: R
authors.lastname: Yang
authors.forename: Xianhong
authors.initials: X
authors.lastname: Yin
authors.forename: Zhigang
authors.initials: Z
authors.lastname: She
authors.forename: Yongcheng
authors.initials: Y
authors.lastname: Lin
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D005658:Fungi / Q000737:chemistry*; D006801:Humans; D020128:Inhibitory Concentration 50; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D044004:Xanthones / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology
chemical_list: C547454:1,7-dihydroxy-2-methoxy-3-(3-methylbut-2-enyl)-9H-xanthen-9-one; C547456:1-hydroxy-4,7-dimethoxy-6-(3-oxobutyl)-9H-xanthen-9-one; D044004:Xanthones