Three dihydroflavonol glycosides, 3-O-α-L-rhamnosides of (2S,3S)-, (2R,3R)- and (2R,3S)-5,7,3',4'-tetrahydroxydihydroflavonol, were isolated from Sphaerostephanos arbuscula as the first example of dihydroflavonols from ferns. Aglycone chirality was determined by 1H-NMR data.
1H-NMR, astilbin, Sphaerostephanos arbuscula, dihydroflavonol, chirality determination, fern
Publication DOI: 10.1248/cpb.43.338Journal NLM ID: 0377775Publisher: Pharmaceutical Society Of Japan
Institutions: Department of Botany, St. Xavier's College (Autonomous), Palayamkottai, India, Department of Chemistry, Manonmaniam Sundaranar University, Tirunelveli, India, Faculty of Pharmaceutical Sciences, Science University of Tokyo, Tokio, Japan
Methods: 13C NMR, 1H NMR, EI-MS, IR, acid hydrolysis, GLC, HPLC, UV, extraction, optical rotation measurement, CD, CC, melting point determination, precipitation, derivatization
Found