Ethanol → 1-methyl-5-(2-phenylethenyl)-1H-pyrazole

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, a mixture of 1-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (1.50 g), β-bromostyrene (1.45 g), bis(triphenylphosphine)palladium(II) dichloride (506 mg), potassium carbonate (1.30 g), ethanol (3.8 mL) and dimethylformamide (7.5 mL) was stirred at 75° C. for 6 hours. Thereafter, 13-bromostyrene (1.45 g) was further added to the reaction solution, and the obtained solution was then stirred at 75° C. for 4 hours. Subsequently, the reaction solution was diluted with ethyl acetate, and was then washed with water. The organic layer was dried over anhydrous magnesium sulfate, and was then concentrated under a reduced pressure. The residue was purified by column chromatography (silica gel 60N, hexane:ethyl acetate=4:1 to 3:1), so as to obtain the title compound (990 mg) in the form of a light yellow solid.

Provenance & Evidence