The structure of gentioflavine, a new alkaloid of some Gentiana species
作者:N.L. Marekov、S.S. Popov
DOI:10.1016/0040-4020(68)88083-4
日期:1968.1
Gentioflavine, a new alkaloid from some Gentiana species, is shown to be a dihydropyridine lactonic alkaloid. Its structure (III) has been established on the basis of NMR and IR spectral evidence, oxidative degradation and conversion into the known alkaloid gentianidine (II).
Synthesis of gentianine N-oxide by enzymatic hydrolysis of swertiamarin in the presence of hydroxylamine and reaction pathway to gentianine and gentianol
materials for the synthesis of gentianine. This study describes the β-glucosidase-catalyzed hydrolysis of gentiopicroside and swertiamarin in the presence of hydroxylamine to afford gentianine N-oxide, which can be a synthetic precursor of gentianine derivatives. Enzymatic hydrolysis of swertiamarin selectively afforded gentianine N-oxide in 81% yield, whereas gentiopicroside afforded gentianine N-oxide and