Six flavonol glycosides and ent-epicatechin were isolated from Dryas octopetala and their structures elucidated by chemical and spectroscopic methods. Two new flavonoids, 3-O-α-L-arabinofuranosyl-8-methoxyquercetin (2) and 3-O-β-galactopyranosyl-8-methoxykaempferol (6), were identified along with 3-O-β-D-galactopyranosylquercetin (hyperin) (3), 3-O-α-L-arabinofuranosylquercetin (avicularin) (5), 3-O-β-L-arabinopyranosylquercetin (4), and 3-O-β-D-galactopyranosyl-8-methoxyquercetin (1).
flavonol glycosides, Dryas octopetala
NCBI PubMed ID: 6512533Publication DOI: 10.1021/np50035a009Journal NLM ID: 7906882Publisher: American Society of Pharmacognosy
Institutions: Dipartimento di Biología, Università di Milano, Milano, Italy, Istituto di Farmacologia e Farmacognosia, Università di Milano, Milano, Italy, Dipartimento di Chimica Organica, Università di Pavia, Pavia, Italy
Methods: 1H NMR, EI-MS, methylation, IR, TLC, acid hydrolysis, GC, extraction, optical rotation measurement, acetylation, CC, RP-HPLC, melting point determination, derivatization, evaporation