Diethylenetriamine (1) reacts with dimethyl acetylenedicarboxylate (2) to give the tetrahydro-pyrazinodiazepinedione (3). On hydrolysis this gives the triazacycloundecanetrione (4).
T. Okawara, S. Ehara, S. Matsumoto, Y. Okamoto, T. Yamasaki and M. Furukawa, J. Chem. Soc., Perkin Trans. 1, 1990, 2615 DOI: 10.1039/P19900002615
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