Simon Carrington, Ian S. Blagbrough and Alan H. Fairlamb
Novel 23-, 24- and 28-membered cyclic polyamine amides (cinnamamides) have been prepared by closure of diphenyl ethers; functionalized conjugates of spermidine and spermine underwent intramolecular aromatic nucleophilic substitution to afford nitro-substituted analogues of cadabicine class (24-membered polyamine lactam) alkaloids.