Toluene → 2-{4-[10-(2-Naphthyl)-9-anthryl]phenyl}benzoxazole

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Reaction Steps

In a 50 mL three-neck flask, 0.90 g (2.0 mmol) of 2-[4-(10-bromo-9-anthryl)phenyl]benzoxazole, 0.37 g (2.2 mmol) of 2-naphthaleneboronic acid, 0.45 g (4.2 mmol) of sodium carbonate, 10 mL of toluene, 3 mL of ethanol, and 2 mL of water were placed. The mixture was degassed by being stirred under reduced pressure, and the air in the flask was replaced with nitrogen. To the mixture, 31 mg (0.027 mmol) of tetrakis(triphenylphosphine)palladium(0) was added, and the mixture was stirred under nitrogen stream at 80° C. for 7 hours. After a certain period, water was added to the mixture, and an aqueous layer was extracted with toluene. The obtained extracted solution and the organic layer were combined and washed with a saturated aqueous solution of sodium hydrogen carbonate and saturated saline, and the organic layer was dried with magnesium sulfate. The mixture was gravity filtered, and the obtained filtrate was condensed to give a solid. The solid was purified by silica gel column chromatograghy (toluene:hexane=2:1) and recrystallized with toluene/hexane, giving 0.92 g of the target yellow powder in a yield of 92%.

Provenance & Evidence