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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

Pyrrolizidine Alkaloids from Lithospermum canescens Lehm.

Helmut Wiedenfeld EMAIL logo , Agnieszka Pietrosiuk , Miroslava Furmanowa and Erhard Roeder

Seven pyrrolizidine alkaloids (PAs) have been isolated from Lithospermum canescens and their structures determined by spectroscopical methods. Besides the known lycopsamine, O7- acetyl-lycopsamine and O7-acetylintermedine four new PAs were found. Their structures are O7-(3-hydroxy-3-methyl-butanoyl)-O9-(+)-trachelanthoyl-heliotridine (= O7-(3-hydroxy-3- methyl-butanoyl)-rinderine = canescine), O7-(3-hydroxy-3-methyl-butanoyl)-O9-(D)-viridifloryl- heliotridine (= O7-(3-hydroxy-3-methyl-butanoyl)-echinatine = canescenine) and their O13-acetyl-derivatives (= acetylcanescine; acetylcanescenine).

Received: 2002-10-15
Revised: 2002-11-12
Published Online: 2014-6-2
Published in Print: 2003-4-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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