title: Chromene chalcones from Tephrosia carrollii and the revised structure of Oaracacin.
abstract: The aerial parts of Tephrosia carrollii afforded two chromene chalcones. Their structures and stereochemistry were established by spectroscopic methods. The structure of oaxacacin was revised and confirmed by X-ray diffraction. In this paper, we describe the isolation of the chalcone known as "oaxacacin" and the new chalcone named epoxyobovatachalcone. The compound der. oaxacacin was found to be identical with obovatachalcone based on spectroscopic evidence and X-ray diffraction.
authors.affiliation: Instituto de Química de la Universidad Nacional Autónoma de México Circuito Exterior, Coyoacán.
authors.forename: F
authors.initials: F
authors.lastname: Gómez-Garibay
authors.forename: M D
authors.initials: MD
authors.lastname: Arciniega
authors.forename: C L
authors.initials: CL
authors.lastname: Céspedes
authors.forename: J
authors.initials: J
authors.lastname: Taboada
authors.forename: J S
authors.initials: JS
authors.lastname: Calderón
mesh_terms: D001578:Benzopyrans / Q000737:chemistry* / Q000302:isolation & purification; D002599:Chalcone / Q000737:chemistry* / Q000302:isolation & purification; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D015394:Molecular Structure; D019685:Rosales / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: C412074:5,7-dimethoxy-2-methyl-2H-benzopyran; D001578:Benzopyrans; D002599:Chalcone; C448638:oaxacacin