Ethyl 3-oxopyrazolidine-4-carboxylates are formed in reactions of hydrazine hydrate with αβ-unsaturated diesters or with β-anilino-diesters. The usefulness of the method is limited by the occurrence of other reactions, notably cleavage of the diesters (to malonohydrazide and the appropriate aldehyde azine); ethyl 3-hydroxypyrazole-4-carboxylate derivatives are also produced, subsequent to formation of the oxopyrazolidines.
C. N. O'Callaghan, J. Chem. Soc., Perkin Trans. 1, 1972, 1416 DOI: 10.1039/P19720001416
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