Fragmentation of the tetracyclic amine (5), initiated by a chloroformate to give the putative iminium ion (6) in the presence of an aromatic nucleophile, provides convenient access to model bis-alkaloids such as (7)–(15).
P. Magnus, M. Ladlow, J. Elliott and C. S. Kim, J. Chem. Soc., Chem. Commun., 1989, 518 DOI: 10.1039/C39890000518
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