title: Andhraxylocarpins A-E: structurally intriguing limonoids from the true mangroves Xylocarpus granatum and Xylocarpus moluccensis.
abstract: Five new limonoids, including andhraxylocarpins A and B (1 and 2) which contain a 9-oxa-tricyclo[3.3.2.1(7, 10)]undecane-2-ene motif, andhraxylocarpins C and D (3 and 4), which contain a (Z)-bicyclo[5.2.1]dec-3-en-8-one substructure, and andhraxylocarpin E (5), which contains a tricyclo[3.3.1.1(3, 6)]decane-9-one scaffold, were isolated from the seeds of two true mangroves, Xylocarpus granatum and Xylocarpus moluccensis, that were collected in the estuaries of Andhra Pradesh, India. The absolute configurations of these compounds were determined by extensive NMR investigations, single-crystal X-ray diffraction analysis, and by circular dichroism and optical rotatory dispersion spectroscopy, in combination with quantum-chemical calculations. The pronounced structural diversity of limonoids from these mangroves might originate from environmental factors.
authors.affiliation: Key Laboratory of Marine Bioresources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, 510301 Guangzhou, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Min-Yi
authors.initials: MY
authors.lastname: Li
authors.forename: Torsten
authors.initials: T
authors.lastname: Bruhn
authors.forename: Daniel C G
authors.initials: DC
authors.lastname: Götz
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xiao
authors.forename: Tirumani
authors.initials: T
authors.lastname: Satyanandamurty
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.forename: Gerhard
authors.initials: G
authors.lastname: Bringmann
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry* / Q000302:isolation & purification / Q000633:toxicity; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D002942:Circular Dichroism; D018360:Crystallography, X-Ray; D006801:Humans; D036701:Limonins / Q000737:chemistry* / Q000302:isolation & purification / Q000633:toxicity; D009682:Magnetic Resonance Spectroscopy; D029582:Meliaceae / Q000737:chemistry*; D051379:Mice; D008968:Molecular Conformation; D009905:Optical Rotatory Dispersion; D011789:Quantum Theory; D012639:Seeds / Q000737:chemistry
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D036701:Limonins