Reaction #1583841

Reaction equation

cesium carbonate

3-(3-chlorophenyl)-1H-pyrazole

salicylaldoxime

5-bromo-2-chlorotoluene

→

title compound

Yield 21.7%

1-(3-methyl-4-chlorophenyl)-3-(3-chlorophenyl)-1H-pyrazole

Yield 21.7%

Solvents

N,N-dimethylformamide

Conditions

Workup

1. 1
   Otherprepared
2. 2
   Temperatureto cool to room temperature
3. 3
   FiltrationThe resulting suspension was filtered
4. 4
   Concentrationthe filtrate was concentrated
5. 5
   OtherThe resulting residue was purified by medium pressure liquid chromatography (2 to 10% gradient of ethyl acetate in hexanes as eluant)

Procedure

A mixture of 3-(3-chlorophenyl)-1H-pyrazole (5.3 g, 29.8 mmol) (prepared according to the method given in European Patent Publication EP 538156), salicylaldoxime (0.58 g, 4.25 mmol), 5-bromo-2-chlorotoluene (2.8 g, 21.3 mmol), copper oxide (0.15 g, 1.06 mmol) and cesium carbonate (11.8 g, 36.2 mmol) in 20 mL of N,N-dimethylformamide was heated at 140° C. overnight and then allowed to cool to room temperature. The resulting suspension was filtered and the filtrate was concentrated under reduce pressure. The resulting residue was purified by medium pressure liquid chromatography (2 to 10% gradient of ethyl acetate in hexanes as eluant) to give the title compound as a white solid (1.4 g).

Source