Hydrogenation of nitrobenzenes bearing aldehyde-containing substituents over heterogeneous platinum or palladium catalysts gives medium and/or large heterocyclic amines as a result of simple or dimeric cyclisation in moderate to good yields; a range of heteroatoms can be incorporated into the macrocycles, enhancing their potential as ligands.
T. Ventrice, E. M. Campi, W. Roy Jackson and A. F. Patti, Chem. Commun., 1999, 1463 DOI: 10.1039/A904168K
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