Abstract:
:Chemical investigations of a microfungus Xylaria sp. isolated from the Australian rainforest tree Glochidion ferdinandi have afforded two new natural products, 2-hydroxy-6-methyl-8-methoxy-9-oxo-9H-xanthene-1-carboxylic acid (1) and 2-hydroxy-6-hydroxymethyl-8-methoxy-9-oxo-9H-xanthene-1-carboxylic acid (2). Compound 1 has previously been synthesised but only partially characterised. Methylation of 1 using diazomethane afforded the crystalline compound 2,8-dimethoxy-6-methyl-9-oxo-9H-xanthene-1-carboxylic acid methyl ester (3), whose structure was determined by single crystal X-ray analysis. This paper reports the full spectroscopic characterisation of compounds 1-3 by NMR, UV, IR and MS data. All compounds were inactive in a brine shrimp lethality assay and several antimicrobial screens.
journal_name
Phytochemistryjournal_title
Phytochemistryauthors
Healy PC,Hocking A,Tran-Dinh N,Pitt JI,Shivas RG,Mitchell JK,Kotiw M,Davis RAdoi
10.1016/j.phytochem.2004.07.019subject
Has Abstractpub_date
2004-08-01 00:00:00pages
2373-8issue
16eissn
0031-9422issn
1873-3700pii
S0031-9422(04)00357-7journal_volume
65pub_type
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