Phytochemistry p. 1181 - 1186 (1995)
Update date:2022-08-16
Topics:
Kayser, Oliver
Kolodziej, Herbert
The sample of natural simple coumarins is extended by discovery of the highly oxygenated representatives 6,8-dihydroxy-7-methoxycoumarin, 6,7,8-trihydroxycoumarin, 6,8-dihydroxy-5,7-dimethoxycoumarin, and 7-acetoxy-5,6-dimethoxycoumarin.They are accompanied in the roots of Pelargonium sidoides by the widely occuring scopoletin, associated with the uncommon analoges 5,6,7-trimethoxycoumarin, 7-hydroxy-5,6-dimethoxycoumarin (umckalin), and 5,6,7,8-tetramethoxycoumarin (artelin), these being reported from a plant source for the second time.The structures of these compounds were established from chemical and spectroscopic studies.Differentiation between oxygenation patterns is discussed on the basis of chemical shift data.
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