Three [1-amino-15N,1-13C]cadaverine (4) units are incorporated to about the same extent into sparteine (5); the presence of only two 13C–15N doublets in the 13C{1H} n.m.r. spectrum of sparteine indicates that two of these units are transformed into the outer rings of sparteine in a specific fashion.
J. Rana and D. J. Robins, J. Chem. Soc., Chem. Commun., 1983, 1335 DOI: 10.1039/C39830001335
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