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In a typical reaction, 3-hydrazinopyridine•dihydrochloride and an anhydrous alcohol are introduced into a reaction vessel and the alkoxide base is gradually added. The mixture is stirred and the acrylonitrile is added. The mixture is stirred 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 1-(pyridin-3-yl)-4,5-dihydro-1H-pyrazol-3-amine (9a) is conveniently isolated and purified by standard techniques.

1. customhas reacted
2. temperatureto cool