Chlorinated iridoid glucosides from Veronica longifolia and their antioxidant activity - PubMed (original) (raw)

. 2010 Sep 24;73(9):1593-6.

doi: 10.1021/np100366k.

Affiliations

• PMID: 20806928
• DOI: 10.1021/np100366k

Chlorinated iridoid glucosides from Veronica longifolia and their antioxidant activity

Søren R Jensen et al. J Nat Prod. 2010.

Abstract

From Veronica longifolia were isolated three chlorinated iridoid glucosides, namely, asystasioside E (6) and its 6-O-esters 6a and 6b, named longifoliosides A and B, respectively. The structures of 6a and 6b were proved by analysis of their spectroscopic data and by conversion to the catalpol ester verproside (5a) or to catalpol (5), respectively. The configuration of the previously known vanilloyl analogue, urphoside B, was shown to be the 6β-epimer (6c) of the structure originally reported. Longifoliosides A (6a) and B (6b) were found to exhibit radical-scavenging activity against nitric oxide, superoxide, and 2,2-diphenyl-1-picrylhydrazyl radicals.

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