Isolation and structure elucidation of secondary metabolites in Central and South American Calea species and their biochemical systematic implications
Fourteen species of the genus Calea (Family Compositae, Tribe Heliantheae) from Central and northern South America, including the type species for the genus, were investigated chemically to determine their secondary metabolites. The taxa studied were C. leptocephala Blake, C. megacephala Rob, and Greenm., and C. trichotoma B. Smith from Mexico, C. prunifolia Kunth (syn. C. pittieri) from Costa Rica, C. prunifolia Kunth from Panama, C. jamaicensis L. from Jamaica, and the Venezuelan species C. berteriana DC., C. divaricata Benthem, C. oliverii Rob. and Greenm., C. prunifolia Kunth, C. septuplinervia Hieron., C. solidaginea Kunth, and C. subcordata Kunth. The chemical investigation of these Calea species, undertaken as part of biochemical systematic study, has resulted in the isolation of 83 compounds, of which 38 are new natural products. The isolated compounds were represented by a dioxin derivative, 3 benzofuranes, 5 chromenes, 12 flavones, and 62 sesquiterpene lactones. The structures of the new compounds were established by chemical and spectroscopic methods. These methods included MS, IR, UV, and CD, /sup 1/H NMR, /sup 13/C NMR, and single crystal x-ray diffraction analysis.
- Research Organization:
- Louisiana State Univ., Baton Rouge (USA)
- OSTI ID:
- 7108241
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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BENZOFURANS
BIOLOGICAL PATHWAYS
FLAVONES
LACTONES
BIOCHEMISTRY
CENTRAL AMERICA
CHROMIUM COMPOUNDS
DICHROISM
METABOLITES
NUCLEAR MAGNETIC RESONANCE
SOUTH AMERICA
SPECTROSCOPY
TAXONOMY
X-RAY DIFFRACTION
BIOLOGY
CHEMISTRY
COHERENT SCATTERING
DIFFRACTION
ESTERS
FLAVENOIDS
FURANS
HETEROCYCLIC COMPOUNDS
LATIN AMERICA
MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RESONANCE
SCATTERING
TRANSITION ELEMENT COMPOUNDS
550201* - Biochemistry- Tracer Techniques