Corona D, Díaz E, Nava JL, Guzmán A, Barrios H, Fuentes A, Hernandez-Plata SA, Allard J, Jankowski CK. (1)H, (13)C NMR and X-ray crystallographic studies of highly polyhalogenated derivatives of costunolide lactone.
Spectrochim Acta A Mol Biomol Spectrosc 2005;
62:604-13. [PMID:
16257765 DOI:
10.1016/j.saa.2005.02.007]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2004] [Revised: 02/11/2005] [Accepted: 02/11/2005] [Indexed: 05/05/2023]
Abstract
The costunolide lactone, a sesquiterpene compound isolated from Zaluzania triiloba species, reacted with several dihalocarbene sources produced by trihaloform-NaOH under successive phase transfer reactions yielding mono-, bis- and tris-dihalocyclopropane adducts. The structures, as well as the configurational assignments of the different derivatives, were established by (1)H and (13)C NMR spectroscopy and assisted by X-ray crystallographic and molecular modelling studies. The specific shielding of protons in the neighbourhood of different halogens on the cyclopropane moieties was correlated to the pseudocontact interactions.
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