Sodium Carbonate → 4-Methyl-6-phenylpyrimidine

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Reaction Steps

First, in a recovery flask equipped with a reflux pipe were put 4.90 g of 4-chloro-6-methylpyrimidine, 4.80 g of phenylboronic acid, 4.03 g of sodium carbonate, 0.16 g of bis(triphenylphosphine)palladium(II) dichloride (abbreviation: Pd(PPh3)2Cl2), 20 mL of water, and 10 mL of acetonitrile, and the air in the flask was replaced with argon. This reaction container was subjected to irradiation with microwaves (2.45 GHz, 100 W) for one hour to be heated. Here, in the flask were further put 2.28 g of phenylboronic acid, 2.02 g of sodium carbonate, 0.082 g of Pd(PPh3)2Cl2, 5 mL of water, and 10 mL of acetonitrile, and the mixture was heated again by irradiation with microwaves (2.45 GHz, 100 W) for 60 minutes. After that, water was added to this solution and extraction with dichloromethane was carried out. The obtained solution of the extract was washed with a saturated sodium carbonate aqueous solution, water, and then with saturated saline, and dried with magnesium sulfate. The solution which had been dried was filtered. The solvent of this solution was distilled off, and then the obtained residue was purified by silica gel column chromatography using dichloromethane and ethyl acetate as a developing solvent in a volume ratio of 9:1, so that a pyrimidine derivative Hmppm, which was the target substance, was obtained (orange oily substance, yield of 46%). Note that the irradiation with microwaves was performed using a microwave synthesis system (Discover, manufactured by CEM Corporation). A synthesis scheme (b-1) of Step 1 is shown below.

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