A mixture of 1.93 g of N-(1-tert-butyl-1H-pyrazol-5-yl)-2-chloro-6-methylpyrimidine -4-amine, 328 mg of palladium acetate, 804 mg of 1,1′-bisdiphenylphosphinoferrocene, 920 mg of sodium hydrogen carbonate, 20 ml of methanol and 20 ml of N,N-dimethylformamide was stirred at 100° C. for 16 hours under 3 atmospheric pressure of carbon monoxide, cooled to room temperature, and then diluted with ethyl acetate. An insoluble matter was filtered off using Celite and the resulting ethyl acetate solution was washed with water and saturated brine. The organic layer was dried over anhydrous magnesium sulfate and filtered, and the filtrate was concentrated. The residue was purified by a silica gel column chromatography (eluent: hexane/ethyl acetate=7/1 to 0/1) to give the title compound.
