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A New Triterpenoid Saponin from Ononis spinosa and Two New Flavonoid Glycosides from Ononis vaginalis

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A New Triterpenoid Saponin from Ononis spinosa and Two New Flavonoid Glycosides from Ononis vaginalis

Kamel H. Shakerb, Katja Dockendorffa, Mirko Bernhardta, and Karlheinz Seiferta

aUniversity of Bayreuth, Organic Chemistry, NW II, D-95440 Bayreuth, Germany.

bNational Research Centre, Laboratory of Natural Products, Dokki-Cairo, Egypt Reprint requests to Prof. Dr. K. Seifert. Fax: 49-921-555358.

E-mail: karlheinz.seifert@uni-bayreuth.de

Z. Naturforsch. 59b, 124 – 128 (2004); received October 21, 2003

The new triterpenoid saponin 3-O-[α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranosyl-(1→2)- β-D-glucuronopyranosyl]-3β,22α-dihydroxyolean-13-en-11-one has been isolated from Ononis spinosa. The new flavonoid glycoside 3-O-[2-O-(E)-p-coumaroyl-β-D-galactopyranosyl]-7-O-β- D-glucopyranosylkaempferol and the new pterocarpan glucoside 3,4-di-O-β-D-glucopyranosyl-4- hydroxymedicarpin have been obtained from Ononis vaginalis. The structures were determined pri- marily by NMR spectroscopy. The assignment of NMR signals was performed by means of1H-1H COSY, ROESY, TOCSY, HMQC HMQC-COSY and HMBC experiments.

Key words: Ononis spinosa, Ononis vaginalis, Triterpenoid Saponin, Flavonoid Glycosides

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