反应详情

2-Hydroxyethylhydrazine (7.6 g.) was added slowly to a solution of potassium carbonate (13.8 g.) in water (40 ml.). The mixture was cooled to 0°, then 2-chloroacrylonitrile (8.75 g.) was added slowly with vigorous stirring. Stirring was continued for a further 17 hours and the mixture was then continuously extracted with EtOAc for 20 hours. On evaporation of the solvent, 3-amino-1-(2-hydroxyethyl)pyrazole was obtained (7.7 g.; 60%), b.p. 170/0.5 mm.

1. temperatureThe mixture was cooled to 0°
2. extractionthe mixture was then continuously extracted with EtOAc for 20 hours
3. customOn evaporation of the solvent