title: New alkaloids from Cephalotaxus fortunei.
abstract: Four new cephalotaxus alkaloids, cephalotaxine alpha-N-oxide (1), cephalotaxine beta-N-oxide (2), 11-beta-hydroxycephalotaxine beta-N-oxide (3), and isocephalotaxine (4), were isolated, together with several known alkaloids from an EtOAc extract of the fruits of Cephalotaxus fortunei. The structures were determined by spectral analysis including mass spectrometry and 2D NMR. Compounds 1, 2, 3, and 4 displayed cytotoxicity against nasopharynx KB cells with IC50 values of 30, 14, 31, and 15 micro g/mL, respectively.
authors.affiliation: Laboratoire de Chimie des Substances Naturelles, ESA 8041, CNRS, Muséum National d'Histoire Naturelle, 63 Rue Buffon 75005 Paris, France.
authors.forename: Mamadou
authors.initials: M
authors.lastname: Bocar
authors.forename: Akino
authors.initials: A
authors.lastname: Jossang
authors.forename: Bernard
authors.initials: B
authors.lastname: Bodo
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D032483:Cephalotaxus / Q000737:chemistry*; D004354:Drug Screening Assays, Antitumor; D005638:Fruit / Q000737:chemistry; D006801:Humans; D020128:Inhibitory Concentration 50; D007624:KB Cells / Q000187:drug effects; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010946:Plants, Medicinal / Q000737:chemistry*; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000470:Alkaloids; D000972:Antineoplastic Agents, Phytogenic