Abstract
AbstractThe preparation of several ethyl 3‐(1,2‐dialkylhydrazino)propanoates (III) by the reaction of 1,2‐dialkylhydrazines with acrylates is described. Compound III is accompanied by small amounts of the bis addition products (V) in the reactions of ethyl acrylate with a few of the hydrazines. Cyclization of III to 1,2‐dialkyl‐3‐pyrazolidinones (IV) was achieved with sodium methoxide. 1,2‐Dialkyl‐5‐methyl‐3‐pyrazolidinones were obtained directly from 1,2‐dialkylhydrazines and ethyl crotonate. A procedure for the preparation of 1,2‐di‐(2‐ethoxycarbonylethyl)hydrazines is also given.
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