Hydrochloric Acid → 2-Pyridin-2-yl-4-pyridin-3-yl-1,2-dihydro-3H-pyrazol-3-one

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Reaction Steps

3.95 g (13.9 mmol) of the compound from Example 3A are initially introduced into 80 ml ethanol under argon and 945 mg (13.9 mmol) sodium ethanolate are added in portions at RT. After stirring for 30 min, 13.9 ml 1 M hydrochloric acid are added dropwise. The precipitate which has separated out is filtered off with suction, washed with cold ethanol (20 ml) and with water (twice with 20 ml each time) and dried in vacuo. 2.80 g (85% of th.) of the title compound are obtained.

Provenance & Evidence