title: Flavonoids from two Lonchocarpus species of the Yucatan Peninsula.
abstract: Leaves, stem bark and root of Lonchocarpus xuul and Lonchocarpus yucatanensis were studied separately. A chalcone, 2',4-dimethoxy-6'-hydroxylonchocarpin (), and the flavones 5,4'-dihydroxy-3'-methoxy-(6:7)-2,2-dimethylpyranoflavone (2) and 5,4'-dimethoxy-(6:7)-2,2-dimethylpyrano-flavone (3), together with the known carpachromene (4), were isolated from the leaves of both species. Similarly, the previously reported flavans xuulanin (5) and 3beta-methoxyxuulanin (6), together with the novel 3beta,4beta,5-trimethoxy-4'-hydroxy-(6:7)-2,2-dimethylpyranoflavan (7), 3-hydroxy-4,5-dimethoxy-(6:7)-2,2-dimethyl-pyranoflavan (8), and 3,4-dihydroxy-5-methoxy-(6:7)-2,2-dimethylpyranoflavan (10), were isolated from the stem bark and root of both species. Finally, the known 2',4'-dihydroxy-3'-(3-methylbut-2-enyl) chalcone (13) was obtained from the root of L. xuul only. The structures of the various metabolites were established by interpretation of their spectroscopic data.
authors.affiliation: Grupo de Química Orgánica, Unidad de Biotecnología, Centro de Investigación Científica de Yucatán, Calle 43 No. 130, Colonia Chuburná de Hidalgo, Mérida, 97200, Yucatán, Mexico
authors.forename: Rocío
authors.initials: R
authors.lastname: Borges-Argáez
authors.forename: Luis M
authors.initials: LM
authors.lastname: Peña-Rodríguez
authors.forename: Peter G
authors.initials: PG
authors.lastname: Waterman
mesh_terms: D007887:Fabaceae / Q000737:chemistry* / Q000145:classification*; D005419:Flavonoids / Q000032:analysis* / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008800:Mexico; D015394:Molecular Structure; D018514:Plant Structures / Q000737:chemistry
chemical_list: D005419:Flavonoids