title: New cytotoxic 1-azaanthraquinones and 3-aminonaphthoquinone from the stem bark of Goniothalamus marcanii.
abstract: Guided by brine shrimp toxicity and human tumor cell toxicity, fractionation of the alcoholic extract from the stem bark of Goniothalamus marcanii led to the isolation of four new 1-azaanthraquinones: marcanines B (3), C (4), D (5), and E (6), along with two known derivatives: marcanine A and dielsiquinone. A new 5-hydroxy-3-amino-2-aceto-1,4-naphthoquinone (7), a possible 1-azaanthraquinone biosynthetic precursor, was also isolated. The structures of the compounds were elucidated by spectroscopic analyses, mainly 1D and 2D NMR techniques ((1)H, (13)C, NOEDS, COSY, HMQC, and HMBC), as well as comparison with literature data. All the compounds except 6 were evaluated for cytotoxic activity. They exhibited significant cytotoxicity against several human tumor cell lines, A-549, HT-29, MCF7, RPMI, and U251 with the ED(50) in the range of 0.04-3.03 microM.
authors.affiliation: Departments of Pharmacognosy, Pharmaceutical Botany, and Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: N
authors.initials: N
authors.lastname: Soonthornchareonnon
authors.forename: K
authors.initials: K
authors.lastname: Suwanborirux
authors.forename: R
authors.initials: R
authors.lastname: Bavovada
authors.forename: C
authors.initials: C
authors.lastname: Patarapanich
authors.forename: J M
authors.initials: JM
authors.lastname: Cassady
mesh_terms: D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006801:Humans; D009285:Naphthoquinones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D018547:Plant Stems / Q000737:chemistry; D010944:Plants / Q000737:chemistry*; D013057:Spectrum Analysis; D014407:Tumor Cells, Cultured
chemical_list: C400575:3-aminonaphthoquinone; D000880:Anthraquinones; D000972:Antineoplastic Agents, Phytogenic; D009285:Naphthoquinones