Sodium Carbonate → HCID 57584405, compound

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Reaction Steps

First, into a recovery flask equipped with a reflux pipe were put 5.0 g of 4,6-dichloropyrimidine, 11.7 g of 2-naphthaleneboronic acid, 7.2 g of sodium carbonate, 0.29 g of bis(triphenylphosphine)palladium(II)dichloride (abbreviation: Pd(PPh3)2Cl2), 20 mL of water, and 20 mL of acetonitrile, and the air in the flask was replaced with argon. This reaction container was heated by irradiation with microwaves (2.45 GHz, 100 W) for 60 minutes. Here, into the flask were further put 2.9 g of 2-naphthaleneboronic acid, 1.8 g of sodium carbonate, 0.070 g of Pd(PPh3)2Cl2, 5 mL of water, and 5 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 an organic layer was extracted with dichloromethane. The obtained organic layer was washed with water and dried with magnesium sulfate. The solution after drying was filtered. The solvent of this solution was distilled off, and then the obtained residue was purified by silica gel column chromatography using hexane and ethyl acetate as a developing solvent in a ratio of 5:1, so that a pyrimidine derivative 4-chloro-6-(naphthalen-2-yl)pyrimidine, which was the objective substance, was obtained (yellow white powder, yield of 48%). Note that the irradiation with microwaves was performed using a microwave synthesis system (Discover, manufactured by CEM Corporation). A synthesis scheme (h-1) of Step 1 is shown below.

Provenance & Evidence