Five biflavonoids from Calycopteris floribunda (Combretaceae)
Copyright policy )Five biflavonoids from Calycopteris floribunda (Combretaceae)
The structures of five biflavonoids, 6"-demethoxyneocalycopterone (1), calyflorenone C (2), 6"-epi-calyflorenone B (3), 6"-epi-calyflorenone C (4) and calyflorenone D (5) from the green parts of Calycopteris floribunda were established by NMR and MS. Their NMR and chiroptical properties (CD, [alpha]20D ) were compared with those of the known C. f. biflavonoids 6-11. Compound 1 represents a calycopterone derivative, 2-5 have a calyflorenone skeleton. With regard to one chiral center (C-6"), 4 and 3 are the respective epimers of 2 and 11.
Molecular Structure, Combretaceae, Circular Dichroism, Biflavonoids, Stereoisomerism, Nuclear Magnetic Resonance, Biomolecular, Mass Spectrometry
Molecular Structure, Combretaceae, Circular Dichroism, Biflavonoids, Stereoisomerism, Nuclear Magnetic Resonance, Biomolecular, Mass Spectrometry
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