N-Glycosides of Amino Acid Amides from Hemerocallis fulva var. sempervirens

概要

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As part of our search for sedative substances from natural sources, we isolated two novel amino acid amides connected with the fructopyranose, kwansonine A (1) and kwansonine B (2), together with three known amino acid amides, longitubanine A (3), longitubanine B (4), and pinnatanine (5), from Hemerocallis fulva L. var. sempervirens (ARAKI) M. HOTTA. The structures of 1 and 2 have been determined on the spectroscopic evidences as N2-(1-β-D-fructopyranosyl)-N5-(2′,5′-dihydro-2′-furyl-3′-hydroxymethyl)-γ-hydroxyglutamine and N2-(1-β-D-fructopyranosyl)-N5-(2-hydroxymethylbutadienyl)-γ-hydroxyglutamine. This is the first report on the isolation of amino acid amide N-furctoside from Hemerocallis genus plant.