title: New naphthopyranone glycosides from Paepalanthus vellozioides and Paepalanthus latipes.
abstract: Three new compounds-3, 4-dihydro-10-hydroxy-7-methoxy-3-(R)-methyl-1H-3,4-dihydronaphtho- ]2, 3c]-pyran-1-one-9-O-beta-D-glucopyranoside (1), 3, 4-dihydro-10-hydroxy-7-methoxy-3-(R)-methyl-1H-3,4-dihydronaphtho- [2, 3c]-pyran-1-one-9-O-beta-D-glucopyranosyl-(1-->6)-glucopyranoside (2), and 3,4-dihydro-10-dihydroxy-7-methoxy-3-(R)-methyl-1H-3, 4-dihydronaphtho-[2,3c]-pyran-1-one-9-O-beta-D-allopyranosyl (1-->6)glucopyranoside (3)-were isolated from the leaves of Paepalanthus vellozioides and Paepalanthus latipes and characterized by spectrometric methods, mainly electrospray mass spectrometry and 1D and 2D NMR experiments. These unusual glycosylated dihydronaphthopyranones may serve as taxonomic markers of the genus Paepalanthus, since these compounds were not detected in other genera belonging to the Eriocaulaceae family.
authors.affiliation: Universidade Estadual Paulista, Instituto de Quimica de Araraquara, Caixa Postal 355, 14800-900 Araraquara, SP, Brazil.
authors.forename: W
authors.initials: W
authors.lastname: Vilegas
authors.forename: A L
authors.initials: AL
authors.lastname: Dokkeddal
authors.forename: S
authors.initials: S
authors.lastname: Piacente
authors.forename: L
authors.initials: L
authors.lastname: Rastrelli
authors.forename: C
authors.initials: C
authors.lastname: Pizza
mesh_terms: D001938:Brazil; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D006027:Glycosides / Q000737:chemistry*; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010946:Plants, Medicinal / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D006027:Glycosides