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Carbon 13 nmr spectral assignments for pyrrolizidine alkaloids

Carbon 13 nmr spectral assignments for pyrrolizidine alkaloids

Journal of Natural Products (Lloydia) 42(2): 417-420

The natural abundance-13C NMR spectra of some [plant] pyrrolizidine alkaloids [many pharmacologically active] and their derivatives, retronecine, retronecine diacetate, retronecine hydrochloride, platynecine, heliotrine, heliotrine acetate, supinine, lasiocarpine, crispatine, monocrotaline and maduresine, were determined at 15.03 MHz. Several important chemical shift-trends were described which identify the basic pyrrolizidine alkaloid skeleton and the various ester groups in these alkaloids. Based on 13C NMR data for crispatine, monocrotaline and madurensine, the chemical shift assignments reported earlier for C-3, C-9, C-12' and C-16, in retrorsine were revised.

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Accession: 004876496

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