title: Diastereoselective addition of diazomethane to zaluzanin A.
abstract: The diastereoselectivity of diazomethane addition to the conjugated double bond of alpha,beta-unsaturated sesquiterpene lactones was explored using zaluzanin A (1) as a model. Thus, the absolute configuration of 1 was assured by X-ray diffraction analysis including evaluation of Flack and Hooft parameters, and by vibrational circular dichroism spectroscopy of its diacetyl derivative 2, while the absolute configuration of the diazomethane addition product, zaluzanin A pyrazoline (3), was determined by evaluation of the 1H NMR chemical shift changes with respect to 1, and confirmed by X-ray diffraction analysis, again including evaluation of Flack and Hooft parameters.
authors.forename: Adriana
authors.initials: A
authors.lastname: Ortiz-León
authors.forename: J Martín
authors.initials: JM
authors.lastname: Torres-Valencia
authors.forename: J Jesús
authors.initials: JJ
authors.lastname: Manríquez-Torres
authors.forename: José G
authors.initials: JG
authors.lastname: Alvarado-Rodríguez
authors.forename: Uvaldo
authors.initials: U
authors.lastname: Hernández-Balderas
authors.forename: Carlos M
authors.initials: CM
authors.lastname: Cerda-García-Rojas
authors.forename: Pedro
authors.initials: P
authors.lastname: Joseph-Nathan
mesh_terms: D003978:Diazomethane / Q000737:chemistry*; D007783:Lactones / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D012717:Sesquiterpenes / Q000737:chemistry*
chemical_list: D007783:Lactones; D012717:Sesquiterpenes; C572031:zaluzanin A; C000591497:zaluzanin A diacetate; C000591498:zaluzanin A pyrazoline; D003978:Diazomethane