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Further iridoid glucosides in the genus Manulea (Scrophulariaceae)
Chrysoula Gousiadou1, Tetsuo Kokubun2, Charlotte H Gotfredsen1
1Department of Chemistry, The Technical University of Denmark, Build. 201, DK-2800 Lyngby, Denmark.
Abstract:
From Manulea altissima (Scrophulariaceae) were isolated five known secoiridoid glucosides sweroside, eustomoside, eustoside, secoxyloganin and secologanoside as well as the 4″-O-rhamnopyranosyl-feruloyl ester of adoxosidic acid, named altissimoside. Also, the caffeoyl phenylethanoid glycoside verbascoside was isolated. In addition two previously unknown terpenoid esters of 6β-hydroxy 8-epi-boschnaloside, named manucoside A and B were isolated from a formerly obtained fraction from the work-up of Manulea corymbosa. The distribution of iridoid glucosides in the Scrophulariaceae is discussed.
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