反应详情

2.78 ml (56 mmol) of hydrazine hydrate are added to a slurry of 9.8 9 (46.8 mmol) of 3-(morpholin-4-yl)-3methylsulfanyl-2-cyanoacrylonitrile in 60 ml of methanol and heated to boiling, with the solid dissolving. After 3.5 hours, the reaction mixture is cooled to RT, concentrated by evaporation and recrystallised from ≈70 ml of boiling ethanol, yielding 5-amino-3-(morpholin-4-yl)-1H-pyrazole-4-carbonitrile: m.p. 199-201° C.; TLC: Rf=0.19 (ethyl acetate/toluene=3 3:1).

1. temperatureheated
2. dissolutiondissolving
3. concentrationconcentrated by evaporation
4. customrecrystallised from ≈70 ml of boiling ethanol