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Elsevier, Phytochemistry, 2(64), p. 529-533, 2003

DOI: 10.1016/s0031-9422(03)00157-2

Elsevier, Phytochemistry, 7(64), p. 1295-1301, 2003

DOI: 10.1016/j.phytochem.2003.08.012

Wiley-VCH Verlag, ChemInform, 2(35), 2004

DOI: 10.1002/chin.200402194

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Absolute configurations of phytotoxins seiricardine A and inuloxin A obtained by chiroptical studies

Journal article published in 2015 by Fevzi Özgökce, Nigel C. Veitch, Ernesto Santoro, Giuseppe Mazzeo, Dirk C. Albach, Nina Rønsted, Ana G. Petrovic, Renée J. Grayer, Alessio Cimmino, Jun Koshoubu, Søren Rosendal Jensen, Antonio Evidente, Maria Angelica Bello, Stefano Superchi ORCID, Nina Berova
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Abstract

A survey of the flavonoid glycosides of selected taxa in the genus Veronica yielded two new acylated 5,6,7,3',4'-pentahydroxyflavone (6-hydroxyluteolin) glycosides and two unusual allose-containing acylated 5,7,8,4'-tetrahydroxyflavone (isoscutellarein) glycosides. The new compounds were isolated from V. liwanensis and V. longifolia and identified using NMR spectroscopy as 6-hydroxyluteolin 4'-methyl ether 7-O-alpha-rhamnopyranosyl(1"'-->2")[6"-O-acetyl-beta-glucopyranoside] and 6-hydroxyluteolin 7-O-(6"-O-(E)-caffeoyl)-beta-glucopyranoside, respectively. Isoscutellarein 7-O-(6"'-O-acetyl)-beta-allopyranosyl(1"'-->2")-beta-glucopyranoside was obtained from both V. intercedens and V. orientalis and its 4'-methyl ether from V. orientalis only. Complete 1H and 13C NMR spectral assignments are presented for both isoscutellarein glycosides. Two iridoid glucosides new to the genus Veronica (melittoside and globularifolin) were also isolated from V. intercedens.