反应详情

温度

100 °C

87 mg of tetrakis(triphenylphosphine)palladium was added to a toluene (25 ml) suspension of 966 mg of methyl 2-(3-cyano-4-{[(trifluoromethyl)sulfonyl]oxy}phenyl)isonicotinate, 610 mg of phenylboronic acid and 518 mg of potassium carbonate, followed by heating at 100° C. in an argon atmosphere for 2 hours. Water was added to the reaction mixture, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=95:5 to 70:30) to obtain 758 mg of methyl 2-(2-cyanobiphenyl-4-yl)isonicotinate. (2) 758 mg of this compound was dissolved in a mixture of 10 ml of methanol and 10 ml of THF, and 7.2 ml of aqueous 1 M sodium hydroxide solution was added thereto, followed by heating at 60° C. for 13 hours. The reaction mixture was cooled to room temperature, neutralized with 1 M hydrochloric acid, and concentrated under reduced pressure. The residue was recrystallized from a mixture of ethanol and water to obtain 472 mg of 2-(2-cyanobiphenyl-4-yl)isonicotinic acid. (3) 414 mg of this compound was dissolved in 15 ml of ethanol, and 1.5 ml of aqueous 1 M sodium hydroxide solution was added thereto, followed by stirring at room temperature for 30 minutes. The reaction solution was concentrated under reduced pressure to obtain 430 mg of sodium 2-(2-cyanobiphenyl-4-yl)isonicotinate.

1. extractionfollowed by extraction with ethyl acetate
2. washThe organic layer was washed with brine
3. customdried
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=95:5 to 70:30)