Chromone and flavonol glycosides from Delphinium hybridum cv. “Belladonna Casablanca”
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One new chromone and six known flavonol glycosides were isolated from the stems and leaves of Delphinium hybridum cv. “Belladonna Casablanca” (Ranunculaceae). The new chromone glycoside was elucidated as 2-methyl-chromone-5,7-diol 7-O-α-l-rhamnopyranosyl-(1→6)-β-d-glucopyranoside (1). The six known flavonol glycosides were designated as compounds 2–5, being kaempferol-type glycosides, and compounds 6 and 7, being quercetin-type glycosides. The structures of these glycosides were determined by two-dimensional nuclear magnetic resonance (2D NMR) spectroscopic analysis and chemical evidence.
KeywordsDelphinium Chromone glycoside Flavonol glycoside Ranunculaceae
We thank Mr. K. Takeda and Mr. T. Iriguchi of the Center for Instrumental Analysis, Kumamoto University, for the NMR measurement.
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