title: Studies on the constituents of Syringa species. X. Five new iridoid glycosides from the leaves of Syringa reticulata (Blume) Hara.
abstract: Five new iridoid glycosides, (8Z)-ligstroside (1), (8Z)-nüzhenide (3), 6'-O-alpha-D-glucopyranosylsyringopicroside (4), 3'-O-beta-D-glucopyranosylsyringopicroside (5) and 4'-O-beta-D-glucopyranosylsyringopicroside (6) were isolated, together with a known one, (8E)-nüzhenide (2), from the leaves of Syringa reticulata. Their structures were established on the basis of chemical and spectral data. Compounds 1 and 3 are the first findings of a (8Z)-oleoside-type secoiridoid. Compound 4 is the first naturally occurring iridoid di-glycoside having an isomaltose.
authors.affiliation: Tohoku Pharmaceutical University, Sendai, Miyagi, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Machida
authors.forename: Atsuko
authors.initials: A
authors.lastname: Kaneko
authors.forename: Tomokazu
authors.initials: T
authors.lastname: Hosogai
authors.forename: Rie
authors.initials: R
authors.lastname: Kakuda
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Yaoita
authors.forename: Masao
authors.initials: M
authors.lastname: Kikuchi
mesh_terms: D039823:Iridoids / Q000737:chemistry* / Q000302:isolation & purification*; D008968:Molecular Conformation; D029592:Oleaceae / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D039823:Iridoids