ETHYL 5-AMINO-1-(4-FLUOROPHENYL)PYRAZOLE-4-CARBOXYLATE Chemical Properties

Melting point:

153 °C

Boiling point:

380.0±32.0 °C(Predicted)

Density 

1.33±0.1 g/cm3(Predicted)

storage temp. 

2-8°C, protect from light

pka

0.99±0.14(Predicted)

Appearance

Off-white to light yellow Solid

CAS DataBase Reference

138907-68-3(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36/37/39

Hazard Note 

Irritant

HS Code 

2933199090

ETHYL 5-AMINO-1-(4-FLUOROPHENYL)PYRAZOLE-4-CARBOXYLATE Usage And Synthesis

Synthesis

The general procedure for the synthesis of ethyl 5-amino-1-(4-fluorophenyl)-1H-pyrazole-4-carboxylate from ethyl ethoxymethylcyanoacetate was as follows: 11.38 g (70.0 mmol) of 4-fluorophenylhydrazine hydrochloride, 11.84 g (70.0 mmol) of ethyl ethoxymethylcyanoacetate and 9.67 g (70.0 mmol) of potassium carbonate were dissolved in 100 mL of ethanol The reaction was heated to reflux overnight. After the reaction was completed, 300 mL of water was added to the reaction mixture and a precipitate was precipitated. The precipitate was collected by filtration and dried under vacuum to give 12.87 g of light yellow crystalline solid in 74% yield. The product was recrystallized from ethanol and the melting point was 151-152 °C. Elemental analysis results (C12H12FN3O2): calculated value C 57.82%, H 4.85%, N 16.86%; measured value C 57.82%, H 4.78%, N 16.79%.

References

[1] Patent: US5064851, 1991, A

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