Efficient schemes for selective N-protection of 1,4,7-triazacyclononane and 1,5,9-triazacyclododecane and for synthesis of related bis-coronands are based upon the synthetic intermediacy of tricyclic orthoamides.
G. R. Weisman, D. J. Vachon, V. B. Johnson and D. A. Gronbeck, J. Chem. Soc., Chem. Commun., 1987, 886 DOI: 10.1039/C39870000886
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