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Coumarins and their taxonomic value in the genus phebalium



Coumarins and their taxonomic value in the genus phebalium



Phytochemistry 31(9): 3083-3089



An examination of the aerial parts of 15 taxa (14 species, two subspecies) of Phebalium (Rutaceae) has confirmed the ubiquitous occurrence of coumarins in the genus. In total 34 coumarins were isolated, of which 28 are new to the genus and seven appear to be novel natural products. The latter have been identified as 7-[(E)-7-hydroxy-3,7-dimethylocta-2,5-dienyloxy]-coumarin, 5-methoxymarmesin, 2',3'-dehydromarmesin, 1'2'-epoxycasegravol-4'-isovalerate {7-methoxy-8-[1,2-epoxy-3-hydroxy-3-methyl-4-(isovaleroyl)-butyl]-coumarin}, murrangatin-1'-acetate [7-methoxy-8-(1-acetoxy-2-hydroxy-3-methylbut-3-enyl)-coumarin], 3',4'-dehydromurrranganon acetate [7-methoxy-8-(1-acetoxy-2-oxo-3-methylbut-3-enyl)-coumarin], and 3',4'-dehydroisomurranganon acetate [7-methoxy-8-(2-acetoxy-1-oxo-3-methylbut-3-enyl)-coumarin]. Earlier comments on the chemotaxonomic value of coumarins of Phebalium are updated in the light of these results.

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Accession: 007165860

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DOI: 10.1016/0031-9422(92)83450-d


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