1,4,7,10-Tetraazacyclododecane reacts regioselectively in acid solution with several chloroformates to give 1,7-diprotected derivatives which could be alkylated and deprotected to afford 1,7-disubstituted 1,4,7,10-tetraazacyclododecanes.
Z. Kovacs and A. D. Sherry, J. Chem. Soc., Chem. Commun., 1995, 185 DOI: 10.1039/C39950000185
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