The pyrazolidinones (IIa–c) react with dimethyl acetylenedicarboxylate (I) to give the tetrahydro-1,2-diazepin-5-ones (IVa–c) as well as the expected Michael addition products (IIIa–c).
S. N. Eğe, E. Y. Tsui, R. L. Spencer, B. E. Potter, B. K. Eagleson and H. Z. Friedman, J. Chem. Soc., Chem. Commun., 1974, 216 DOI: 10.1039/C39740000216
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