Abstract
Dunaliine A (1), a new amino diketone, has been isolated from the leaves of Desmos dunalii together with four known dihydrochalcones: 2′,4-dihydroxy-4′,6′-dimethoxy-3′,5′-dimethyldihydrochalcone (2), 2′,4-dihydroxy-4′,6′-dimethoxydihydrochalcone (3), 2′,4-dihydroxy-4′,5′,6′-trimethoxydihydrochalcone (4) and 2′,4-dihydroxy-5′-methyl-4′,6′-dimethoxydihydrochalcone (5). The structures of these compounds were established notably by spectral analysis (1D- and 2D- 1H, 13C NMR), UV, IR and HRMS.
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Acknowledgements
This work was supported by F-Vote (No. Vote: F0150/2002C) of the University of Malaya. We also would like to thank Christian Girard for the HREIMS results.