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New chromonocoumarin (=6H, 7H-[1]Benzopyrano[4,3-b][1]benzopyran-6,7-dione) derivatives from Polygala fruticosa BERG

โœ Scribed by Ermindo R. Di Paolo; Matthias O. Hamburger; Helen Stoeckli-Evans; Colin Rogers; Kurt Hostettmann

Publisher
John Wiley and Sons
Year
1989
Tongue
German
Weight
532 KB
Volume
72
Category
Article
ISSN
0018-019X

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โœฆ Synopsis

Three chromonocoumarins ( = 6H,7H- [ l]benzopyrano [4.3-6][ l]benzopyran-6,7-diones) 1-3 have been isolated from the leaves and the root bark of Polygala fruticosa BERG. (syn. Polygala oppositifolia L.; Polygalaceae). The structure of frutinone A (1) was established by X-ray diffraction analysis. The structures of the previously undescribed compounds frutinone B (2) and C (3) were deduced by spectroscopic methods (EI-MS, UV, IR, 'Hand I3C-NMR, including NOE and COSY) in comparison with 1. Chromonocoumarins 1-3 are the first representatives of a new type of naturally occurring compounds. Frutinone A shows strong fungicidal activity against Cladosporium cucumerinum.

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## Abstract For Abstract see ChemInform Abstract in Full Text.