title: Chemical constituents of Piptadenia gonoacantha J.F. Macbr.
abstract: The phytochemical investigation of Piptadenia gonoacantha (Mart.) J.F. Macbr. (Leguminosae-Mimosoideae), commonly known as "pau jacaré" (alligator stick), afforded sitosterol, campesterol, stigmasterol, the N-benzoylphenylalanine-2-benzoylamide-3-phenylpropyl ester, known as asperphenamate, sitosterol-3-O-β-D-glucopyranoside, besides three flavonoids, apigenin, 5-O-methylapigenin and 7,4'-dihydroxy-3',5-dimethoxyflavone from its branches. From its leaves, the methyl gallate and two flavonoids, vitexin and isovitexin, were isolated. From its bark, a mixture of sitosterol, campesterol, and stigmasterol, besides a mixture of cycloartenone, cycloartan-25-en-3-one, and 24-methylene-cycloartenone, and the pure triterpenes 24-methylenecycloartanol, friedelin, lupeol and lupenone, were isolated. Their structures were established on the basis of spectral analysis, comparison with literature data and GC-MS analysis of the mixtures. The ester, flavonoids and the cycloartanes are been identified for first time in the genus Piptadenia.
authors.affiliation: Departamento de Química, ICE, Universidade Federal Rural do Rio de Janeiro, Serópedica, RJ, Brazil. mgeraldo@ufrrj.br
authors.forename: Mário G de
authors.initials: MG
authors.lastname: Carvalho
authors.forename: Maritza A R
authors.initials: MA
authors.lastname: Cardozo
authors.forename: Francisco E A
authors.initials: FE
authors.lastname: Catunda Junior
authors.forename: Acácio G de
authors.initials: AG
authors.lastname: Carvalho
mesh_terms: D002850:Chromatography, Gel; D007887:Fabaceae / Q000737:chemistry* / Q000145:classification; D013058:Mass Spectrometry; D024301:Plant Bark / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*
chemical_list: D010936:Plant Extracts