Potassium Carbonate → 2-(1-{[4-chloro-2-(trifluoromethyl)phenyl]methyl}-1H-pyrazol-3-yl)-1H-isoindole-1,3(2H)-dione

Participants

Reaction Steps

A mixture of 2-(1H-pyrazol-3-yl)-1H-isoindole-1,3(2H)-dione (for a preparation see Intermediate 28)(3 g, 14.1 mmol) and potassium carbonate (2.92 g, 21.1 mmol) in DMF (30 ml) was stirred under nitrogen at ambient temperature for 5 min. To the pale yellow suspension was added 1-(bromomethyl)-4-chloro-2-(trifluoromethyl)benzene (3.85 g, 14.07 mmol, Alfa Aesar). The mixture turned to a colourless suspension. The reaction mixture was stirred at ambient temperature under nitrogen overnight. The reaction mixture was diluted with DCM (50 ml) and water (50 ml). To the emulsion was added brine (30 ml). The resulting phases were separated and the aqueous layer further extracted with DCM (50 ml). The combined organic extracts were filtered through a hydrophobic frit and the solvent removed in vacuo to give 2-(1-{[4-chloro-2-(trifluoromethyl)phenyl]methyl}-1H-pyrazol-3-yl)-1H-isoindole-1,3(2H)-dione (6.14 g) as an off-white gum.

Provenance & Evidence