title: Caffeoyl arbutin and related compounds from the buds of Vaccinium dunalianum.
abstract: Dunalianosides A-I (1-9), esters of arbutin and related phenolic glucosides, were isolated from the buds of Vaccinium dunalianum Wight (Ericaceae) together with 20 known compounds, and their structures were established on the basis of 1- and 2D NMR spectroscopic evidence. Dunalianosides F-H were dimers of p-hydroxyphenyl 6-O-trans-caffeoyl-beta-D-glucopyranoside (10). The latter was obtained in extraordinary high yield (22% of dry weight), and dunalianoside I (9) was found to be a conjugate of arbutin with an iridoid glucoside.
authors.affiliation: Laboratory of Natural Product Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo Machi 1-14, Nagasaki 852-8521, Japan.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhao
authors.forename: Takashi
authors.initials: T
authors.lastname: Tanaka
authors.forename: Keisuke
authors.initials: K
authors.lastname: Hirabayashi
authors.forename: Ying-Jun
authors.initials: YJ
authors.lastname: Zhang
authors.forename: Chong-Ren
authors.initials: CR
authors.lastname: Yang
authors.forename: Isao
authors.initials: I
authors.lastname: Kouno
mesh_terms: D001104:Arbutin / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000378:metabolism; D002109:Caffeic Acids / Q000737:chemistry* / Q000378:metabolism; D035264:Flowers / Q000737:chemistry*; D015394:Molecular Structure; D029796:Vaccinium / Q000737:chemistry*
chemical_list: D002109:Caffeic Acids; D001104:Arbutin