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Abstract
The regio-specific bromination of multiflorine, an alkaloid isolated from Lupinus albus is described. The bromomultiflorine and its molecular complex with succinimide have been characterized by IR and NMR spectroscopy, as well as by X-ray diffraction. The conformation in solution and in the solid state has been determined. The molecular complex formation between 3-bromomultiflorine and succinimide molecules is the first case in the class of lupine alkaloids. Both molecules of this complex are held together by an intermolecular hydrogen bond NH⋯N which leads to a conversion of alkaloid nitrogen atom configuration. As a consequence, ring C adopts a chair conformation, whereas it is in a boat form in 3-bromomultiflorine.
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