Photoreduction and ketone-sensitized reduction of alkaloids.
作者： Helmut Görner , Zsombor Miskolczy , Mónika Megyesi , László Biczók
DOI: 10.1111/J.1751-1097.2010.00880.X
关键词:
摘要: The photoprocesses of berberine, palmatine, coralyne, sanguinarine, flavopereirine and ellipticine were studied in several solvents. quantum yields Φ(Δ) singlet molecular oxygen formation palmatine sanguinarine are moderate dichloromethane (0.2-0.6) much smaller acetonitrile or trifluoroethanol. For the other alkaloids examined, is rather independent solvent polarity. direct ketone-sensitized photolysis, using steady-state irradiation at 313 nm 248/308 laser pulses, was by absorption fluorescence spectroscopy. Thereby, radicals observed yielding eventually dihydro derivatives as major products, which thermally back-converted on admission oxygen. yield conversion to dihydroalkaloids enhanced presence triethylamine. reaction ketones electron H-atom donors has a close unity.
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