title: New sesquiterpenes from Crossopetalum tonduzii.
abstract: Five new sesquiterpenes (1-5) with a dihydro-beta-agarofuran skeleton were isolated from Crossopetalum tonduzii. Their structures were elucidated by means of 1H and 13C NMR spectroscopic studies, including homonuclear and heteronuclear correlation experiments (COSY, ROESY, HMQC, and HMBC). The absolute configurations of 1 and 2 were determined by CD studies and chemical correlation. Compounds 1-3 were assayed against Spodoptera littoralis in an election test and showed low insect-antifeedant activity.
authors.affiliation: Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, La Laguna, 38206 Tenerife, Canary Islands, Spain.
authors.forename: B M
authors.initials: BM
authors.lastname: Tincusi
authors.forename: I A
authors.initials: IA
authors.lastname: Jiménez
authors.forename: A G
authors.initials: AG
authors.lastname: Ravelo
authors.forename: R
authors.initials: R
authors.lastname: Missico
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D005247:Feeding Behavior / Q000187:drug effects*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010176:Panama; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D010944:Plants / Q000737:chemistry*; D012717:Sesquiterpenes / Q000302:isolation & purification* / Q000494:pharmacology; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D018411:Spodoptera / Q000502:physiology*
chemical_list: D010936:Plant Extracts; D012717:Sesquiterpenes