Phosphorus oxychloride → 5-Chloro-2,3-bis(3,5-dimethylphenyl)pyrazine

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Reaction Conditions

Reaction Steps

Then, 7.0 g of 2,3-bis(3,5-dimethylphenyl)pyrazin-1-oxide obtained in Step 2 was put into a 100 mL three-neck flask and the air in the flask was replaced with nitrogen. Here, 20 mL of phosphoryl chloride was added and the mixture was stirred at 100° C. for 1 hour. The reacted solution was poured into water and the solution was subjected to extraction with chloroform. The obtained organic layer was washed with a saturated aqueous solution of sodium hydrogen carbonate, water, and saturated brine, and dried with magnesium sulfate. After the drying, the solution was filtered. The solvent of this solution was distilled off, whereby the pyrazine derivative to be produced was obtained as a gray powder in a yield of 90%. A synthesis scheme of Step 3 is shown in (h-3).

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