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BRANCO, Alexsandro; PINTO, Angelo C.; SCHRIPSEMA, Jan  and  BRAZ-FILHO, Raimundo. Anthraquinones from the bark of Senna macranthera. An. Acad. Bras. Ciênc. [online]. 2011, vol.83, n.4, pp.1159-1164. ISSN 0001-3765.

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 1H and 13C NMR chemical shifts were assigned by NMR one- (1HNMR, {1H}-13CNMR, and APT-13CNMR) 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.

Keywords : anthraquinone; 2-acetyl-physcion; Fabaceae; Senna acranthera.

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