Abstract
The ethanol extract of the roots of Pelargonium sidoides (Geraniaceae) has yielded three novel coumarin sulfates, including 5,6-dimethoxycoumarin 7-sulfate and a mixture of the 6- and 8-monosulfate of 6,8-dihydroxy-5,7-dimethoxycoumarin. Their structures were determined unambiguously by comprehensive analyses of their NMR and MS data. Attempts to synthesize these compounds by adopting the dicyclohexylcarbodiimide-mediated esterification of their parent highly oxygenated coumarins with tetrabutylammonium hydrogen sulfate were unsuccessful. In contrast, this method was useful for the sulfation of a series of mono- and dioxygenated coumarins in a model reaction.
Cite
CITATION STYLE
Kolodziej, H., Kayser, O., & Tan, N. (2002). Novel Coumarin Sulfates from Pelargonium sidoides. In Natural Products in the New Millennium: Prospects and Industrial Application (pp. 59–64). Springer Netherlands. https://doi.org/10.1007/978-94-015-9876-7_3
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