title: Dimeric Erythrina alkaloids from the flower of Erythrina variegata.
abstract: Unprecedented dimeric Erythrina alkaloids, spirocyclic (6/5/6/6) erythrivarine A (1) and spiro-fused (6/5/7/6) rings erythrivarine B (2), were isolated from the cultivated plant, E. variegata. The structures were determined on the basis of 1D and 2D NMR, FTIR, UV, and mass spectroscopic data and X-ray crystal diffraction. The biogenetic relationship of 1 and 2 is proposed.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Scienes , Kunming 650201, People's Republic of China.
authors.forename: Bing-Jie
authors.initials: BJ
authors.lastname: Zhang
authors.forename: Mei-Fen
authors.initials: MF
authors.lastname: Bao
authors.forename: Chun-Xia
authors.initials: CX
authors.lastname: Zeng
authors.forename: Xiu-Hong
authors.initials: XH
authors.lastname: Zhong
authors.forename: Ling
authors.initials: L
authors.lastname: Ni
authors.forename: Ying
authors.initials: Y
authors.lastname: Zeng
authors.forename: Xiang-Hai
authors.initials: XH
authors.lastname: Cai
mesh_terms: D000470:Alkaloids / Q000737:chemistry* / Q000302:isolation & purification; D004895:Erythrina / Q000737:chemistry*; D035264:Flowers; D026121:Indole Alkaloids / Q000138:chemical synthesis* / Q000737:chemistry / Q000302:isolation & purification; D007212:Indolizines / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D013141:Spiro Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000302:isolation & purification; D014961:X-Ray Diffraction
chemical_list: D000470:Alkaloids; D026121:Indole Alkaloids; D007212:Indolizines; D013141:Spiro Compounds; C000600371:erythrivarine A; C000600372:erythrivarine B