Toluene → 7-Bromo-2-tert-butyl-5-methyl-6-(3-nitrophenyl)-1,3-benzoxazole-4-carbonitrile

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A mixture of N-(2-bromo-5-cyano-3-hydroxy-6-methyl-3′-nitrobiphenyl-4-yl)-2,2-dimethylpropionamide (I-15) (490 mg, 1.13 mmol), p-toluenesulfonic acid monohydrate (22 mg, 4.23 mmol) and toluene (50 ml) was heated under reflux for 3 hours. After cooling, the reaction liquid was diluted with ethyl acetate, successively washed with an aqueous saturated sodium hydrogencarbonate solution and saturated brine, dried on anhydrous magnesium sulfate, the solvent was evaporated away under reduced pressure to obtain a pale brown residue. The resulting residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=5:1) to obtain the entitled compound (433 mg, 93%) as a pale yellow solid.

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