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In a preferred reaction, sodium ethoxide in an anhydrous ethanol are introduced into a reaction vessel and 3-hydrazinopyridine•dihydrochloride is added. The mixture is stirred and diethyl maleate is added. The mixture is heated at about 60° C. until most of the 3-hydrazinopyridine has reacted. The mixture is allowed to cool and the excess base is neutralized with acid. The crude ethyl 5-oxo-2-(pyridin-3-yl)pyrazolidine-3-carboxylate (10a) is conveniently isolated and purified by standard techniques.

1. additionare introduced into a reaction vessel
2. customhas reacted
3. temperatureto cool