New Pyrrolizidine Alkaloids and Glycosides from Anchusa strigosa

Abstract

Six new pyrrolizidine alkaloids, a new carboxylic acid, a new phenolic and a new oleanane glycoside, together with the known compounds 7,7′-bis-(4-hydroxy-3,5-dimethoxyphenyl)-8,8′-dihydroxymethyltetrahydrofuran 4′-O-β-D-glucopyranoside, rosmarinic acid, caffeic acid, tormentic acid 28-O-β-D-glucopyranoside, euscaphic acid 28-O-β-D-glucopyranoside, euscaphic acid, and allantoin were isolated from Anchusa strigosa roots. Their structures were established by high resolution NMR, MS, elemental analysis, and chemical reactions.

Key words

Anchusa strigosa - Boraginaceae - pyrrolizidine alkaloids - phenolic glycoside - oleanane glycoside

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