ISOLATION OF CANDIRONE: A NOVEL PENTAOXIGENATION PATTERN IN A NATURALLY OCCURRING 2-PHENYL-4H-1-BENZOPYRAN-4-ONE FROM TEPHROSIA CANDIDA

Article abstract of DOI:10.1016/S0040-4020(01)83467-0

Two flavones having very similar physical behaviour and spectral data have been isolated as minor constituents from the seeds of Tephrosia candida.Based upon a detailed and critical study of their mass spectra, extent of shifts in their UV spectra, X-ray diffraction studies, and preparation of their derivatives, the structures of these compounds have been established; one was found to be penduletin (1) and the other 5-hydroxy-2-(4-hydroxyphenyl)-3,6,8-trimethoxy-4H-1-benzopyran-4-one (2), for which the name candirone is proposed.To the best of our knowledge the latter is a new compound and this type of oxygenation pattern is not known earlier among natural flavones.