New Coumarins from Pterocaulon polystachyum

 

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Abstract

Aerial parts of Pterocaulon polystachyum from Chaco province, Argentina, afforded the known coumarins ayapin, isoscopoletin, prenyletin, prenyletin methyl ether, virgatenol, obtusinin, 5-methoxy-6,7-methylenedioxycoumarin, 5-(3,3-dimethylallyloxy)-6,7-methylenedioxycoumarin, 5-(2′,3′-dihydroxy-3-methylbutanoxy)-6,7-methylenedioxycoumarin, haplopinol methyl ether, 6-(1,1-dimethyl-2-propenyl)-7-hydroxycoumarin and demethylnieshoutin; the last two are new as natural products while the five new coumarins from the collection were isovirgatenol, 3′-deoxyobtusinin, 6-methoxy-7-(2′-hydroxyethoxy)-coumarin, 5-(2′-hydroxyethoxy)-6,7-methylenedioxycoumarin and a substance tentatively identified as 5-hydroxy-6,7-methylenedioxy-8-(3,3-dimethylallyl)-coumarin.

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Prof. Werner Herz

Department of Chemistry

The Florida State University

Tallahassee

FL 32306-4390

USA

Fax: +1-850-644-8281

Email: jdulin@chem.fsu.edu