Ethanol → 2-Methyl-1'H,2H-3,4'-bipyrazole

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, a mixture of 5-iodo-1-methyl-1H-pyrazole (750 mg), [1-(tert-butoxycarbonyl)-1H-pyrazol-4-yl]boronic acid (1.27 g), tetrakis(triphenylphosphine)palladium(0) (209 mg), 2 M sodium carbonate aqueous solution (3.6 mL), ethanol (3.6 mL) and toluene (7.2 mL) was stirred at 100° C. for 14 hours. Thereafter, water was added to the reaction solution, and the obtained mixture was then extracted with ethyl acetate. 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 cartridge, hexane:ethyl acetate=4:1 to 0:10), so as to obtain the title compound (176 mg) in the form of a light yellow solid.

Provenance & Evidence