title: Dimeric aporphine alkaloids of Phoenicanthus obliqua from Sri Lanka.
abstract: A new dimeric aporphine alkaloid, phoenicanthusine (1), and six known alkaloids were isolated from the stem bark of Phoenicanthus obliqua. The structure of 1 was elucidated by 1D ((1)H, (13)C) and 2D ((1)H-(1)H COSY, HMQC, HMBC, and NOESY) NMR and HRMS studies. Phoenicanthusine represents the first example of a N-6--C-4' and C-7--C-5' linked dimeric aporphine alkaloid.
authors.affiliation: Southwest Center for Natural Products Research & Commercialization, Office of Arid Lands Studies, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706-6800, USA. kithsiri@ag.arizona.edu
authors.forename: E M
authors.initials: EM
authors.lastname: Wijeratne
authors.forename: B
authors.initials: B
authors.lastname: Don Lankananda
authors.forename: Y
authors.initials: Y
authors.lastname: Tezuka
authors.forename: T
authors.initials: T
authors.lastname: Nagaoka
authors.forename: A A
authors.initials: AA
authors.lastname: Gunatilaka
mesh_terms: D029061:Annonaceae / Q000737:chemistry*; D001060:Aporphines / Q000737:chemistry / Q000302:isolation & purification*; D002855:Chromatography, Thin Layer; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013188:Sri Lanka
chemical_list: C442599:7,7'-bis(dehydro-O-methylisopiline); C442601:7-dehydronuciferyl-7'-dehydro-O-methylisopiline; D001060:Aporphines; C442600:phoenicanthusine; C442602:urabaine