Ammonium Chloride → 2-Cyclopropyl-7-fluoro-6-(2-fluorophenyl)-5-methyl-1,3-benzoxazole-4-carbonitrile

Participants

Reaction Conditions

Reaction Steps

6-Bromo-2-cyclopropyl-7-fluoro-5-methyl-1,3-benzoxazole-4-carbonitrile (I-77) (200 mg, 0.68 mmol), 2-fluorophenylboronic acid (380 mg, 2.71 mmol) and tripotassium phosphate (288 mg, 1.36 mmol) were dissolved in 1,4-dioxane (8 ml), then at room temperature, tetrakis(triphenylphosphine)palladium(0) (157 mg, 0.14 mmol) was added. The solution was stirred under nitrogen atmosphere at 95° C. for 48 hours. After cooling to room temperature, aqueous saturated ammonium chloride solution was added to the reaction liquid, followed by stirring at room temperature for 5 minutes. This was extracted twice with ethyl acetate.

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