反应详情

Sequentially add tri-tert-butylphosphine (88 mg, 0.437 mmol) in anhydrous 1,4-dioxane (1 mL), diisopropylethylamine (1.5 mL, 8.74 mmol), 5-bromo-2-fluorobenzoic acid methyl ester, (prepared as described in PREPARATION 42), (1.69 g, 7.28 mmol) and a solution of 5-ethynylnicotinonitrile, (prepared as described in PREPARATION 4), (0.93 g, 7.28 mmol) in anhydrous 1,4-dioxane (4 mL), to a stirring mixture of dichloro(benzonitrile)palladium (II) (84 mg, 0.218 mmol) and copper (I) iodide (28 mg, 0.146 mmol) in anhydrous 1,4-dioxane (1 mL) under nitrogen. Stir for 2 h and concentrate. Purify the residue twice by silica gel chromatography, eluting with 10:90 ethyl acetate:hexanes, to give the title compound as a white solid (0.9 g, 44%).

1. concentrationconcentrate
2. customPurify the residue twice by silica gel chromatography
3. washeluting with 10:90 ethyl acetate