Sodium Hydroxide → 5'-Acetyl-2'-fluorobiphenyl-2-carbonitrile

関与物質

反応手順

1-(3-Chloro-4-fluorophenyl)ethanone (0.86 g, 5.0 mmol), 2-(4,4,5,5-tetramethyl[1,3,2]dioxaborolan-2-yl)benzonitrile (1.37 g, 6.0 mmol) (prepared according to the procedure described in WO 02/74773) and potassium fluoride (0.96 g, 16.5 mmol) were suspended in tetrahydrofuran (20 ml) and the mixture degassed with nitrogen for 30 min. Tris(dibenzylidineacetone)dipalladium(0) (0.14 g, 0.15 mmol) and tri-tert-butylphosphine (0.3M in 1,4-dioxane, 1.0 ml) were added and the mixture stirred at room temperature for 1 h then heated at 50° C. for 18 h. The mixture was allowed to cool to room temperature and then poured into 0.5N sodium hydroxide solution (300 ml) and stirred for 30 min. The solid was filtered, washed with water (50 ml) and isohexane (50 ml) and the brown solid left to air-dry. The solid was purified by flash column chromatography on silica eluting with isohexane on a gradient of ethyl acetate (10-30%). Collecting the appropriate fractions gave 5′-acetyl-2′-fluorobiphenyl-2-carbonitrile (0.31 g, 26%) as a yellow solid: δH(400 MHz, CDCl3) 2.64 (3H, s), 7.31 (1H, t, J 8.8 Hz), 7.52-7.56 (2H, m), 7.68-7.72 (1H, m), 7.81 (1H, dd, J 0.8, 7.4 Hz), 8.04-8.09 (2H, m).

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