作者:C. N. O'Callaghan
DOI:10.1039/p19720001416
日期:——
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
3-水合吡唑烷-4-羧酸乙酯是在水合肼与αβ-不饱和二酯或与β-苯胺基二酯反应中形成的。该方法的有用性受到其他反应的发生的限制,特别是二酯的裂解(丙二酰肼和适当的醛嗪);在形成氧代吡唑烷之后,还产生了3-羟基吡唑-4-羧酸乙酯衍生物。