Heliespirones B and C: two new plant heliespiranes with a novel spiro heterocyclic sesquiterpene skeleton.
From the medium, polar bioactive fractions of leaf aqueous extract of Helianthus annuus L., heliespirones B (2) and C (3) have been isolated. The structural elucidation was based on extensive spectral studies. A probable biogenesis of heliespirone skeleton is proposed and discussed. The structure of heliespirone B has been confirmed by X-ray diffraction analysis.
Macías
Francisco A
FA
Grupo de Alelopatía, Departamento de Química Organica, Universidad de Cadiz, Facultad de Ciencias, C/República Saharaui s/n, 11510 Puerto Real, Cadiz, Spain.
Galindo
José L G
JL
Varela
Rosa M
RM
Torres
Ascensión
A
Molinillo
José M G
JM
Fronczek
Frank R
FR
D016227:Benzoquinones / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006571:Heterocyclic Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D010944:Plants / Q000737:chemistry*; D012717:Sesquiterpenes / Q000737:chemistry*
D016227:Benzoquinones; D006571:Heterocyclic Compounds; D012717:Sesquiterpenes; C520940:heliespirone B; C520941:heliespirone C