Reaction #83236

Reaction equation

5-amino-3-(4-fluorophenyl)-4-(pyridin-4-yl)pyrazole

1,1-dicyano-2-ethoxyethylene

→

7-amino-6-cyano-2-(4-fluorophenyl)-3-(pyridin-4-yl)pyrazolo[1,5-a]pyrimidine

Yield 59.3%

Solvents

acetic acid

Conditions

Workup

1. 1
   Temperaturewas refluxed for 1 hour
2. 2
   ConcentrationThe reaction mixture was concentrated in vacuo
3. 3
   Otherthe residue was crystallized from ethanol

Procedure

A mixture of 5-amino-3-(4-fluorophenyl)-4-(pyridin-4-yl)pyrazole (100 mg) and 1,1-dicyano-2-ethoxyethylene (49 mg) in acetic acid (2 ml) was refluxed for 1 hour. The reaction mixture was concentrated in vacuo and the residue was crystallized from ethanol to give 7-amino-6-cyano-2-(4-fluorophenyl)-3-(pyridin-4-yl)pyrazolo[1,5-a]pyrimidine (77 mg).

Source