title: Constituents from the root and stem of Aristolochia elegans.
abstract: Four new tetralones, aristelegone-A (1), aristelegone-B (2), aristelegone-C (3), and aristelegone-D (4); one new isoquinoline, pericampylinone-A (5); four new biphenyl ethers, aristogin-A (6), aristogin-B (7), aristogin-D (8), and aristogin-E (9); three new lignans, aristelegin-A (10), aristelegin-B (11), and aristelegin-C (12); and a new dimer, aristolin (13), have been isolated from the root and stem of Aristolochia elegans. The structures were established on the basis of 1D and 2D NMR and mass spectral data. This is the first report of isoquinolones and biphenyl ethers from this plant which may be representative units for the formation of bisbenzylisoquinoline alkaloids that are common metabolites of Aristolochia species. Aristolin (13) is also the first report of a diterpene linked with an aristolochic acid.
authors.affiliation: Department of Chemistry, National Cheng Kung University, Tainan, Taiwan, Republic of China. tswu@mail.ncku.edu.tw
authors.forename: Tian-Shung
authors.initials: TS
authors.lastname: Wu
authors.forename: Yao-Lung
authors.initials: YL
authors.lastname: Tsai
authors.forename: A G
authors.initials: AG
authors.lastname: Damu
authors.forename: Ping-Chung
authors.initials: PC
authors.lastname: Kuo
authors.forename: Pei-Lin
authors.initials: PL
authors.lastname: Wu
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification*; D030022:Aristolochia / Q000737:chemistry*; D007546:Isoquinolines / Q000737:chemistry / Q000302:isolation & purification*; D017705:Lignans / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010647:Phenyl Ethers / Q000737:chemistry / Q000302:isolation & purification*; D018517:Plant Roots / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D013624:Taiwan
chemical_list: D000470:Alkaloids; D007546:Isoquinolines; D017705:Lignans; D010647:Phenyl Ethers