title: Anthraquinones from the bark of Senna macranthera.
abstract: 2-acetyl physcion (2-acetyl-1,8-dihydroxy-6-methoxy-3-methyl-9,10-anthraquinone, 2), a rare anthraquinone, was isolated from Senna macranthera var. nervosa (Vogel) H.S. Irwin & Barneby (Fabaceae). The chemical structure was elucidated and all (1)H and (13)C NMR chemical shifts were assigned by NMR one- ((1)HNMR, {(1)H}-(13)CNMR, and APT-(13)CNMR) and two (COSY, NOESY, HMQC and HMBC) dimensional of this natural compound. Furthermore, the minor anthraquinones chrysophanol (3), chrysophanol-8-methyl ether (4) and physcion (5) were characterized by GC-MS analysis. The occurrence of the anthraquinones 3-5 confirms that S. macranthera is a typical representative of the genus Senna.
authors.affiliation: Laboratório de Fitoquímica, Departamento de Saúde, Universidade Estadual de Feira de Santana, Brazil. branco@uefs.br
authors.forename: Alexsandro
authors.initials: A
authors.lastname: Branco
authors.forename: Angelo C
authors.initials: AC
authors.lastname: Pinto
authors.forename: Jan
authors.initials: J
authors.lastname: Schripsema
authors.forename: Raimundo
authors.initials: R
authors.lastname: Braz-Filho
mesh_terms: D000880:Anthraquinones / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D029846:Senna Plant / Q000737:chemistry*
chemical_list: D000880:Anthraquinones