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A number of chiral unsymmetrically N-substituted 1,4,7-triazacyclononane ligands have been prepared by modular methods. The key step in the synthesis centres on the macrocyclisation of three tertiary amide precursors under standard Richman–Atkins conditions which allows for subsequent N-functionalisation.

Graphical abstract: The synthesis of unsymmetrically N-substituted chiral 1,4,7-triazacyclononanes

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