反应详情

4-Iodo-2-fluoropyridine (1.09 g, 4.9 mmol) was dissolved in anhydrous tetrahydrofuran (20 mL). To this solution was added triethylamine (0.9 mL, 6.5 mmol), copper (I) iodide (80 mg, 0.4 mmol) and dichlorobis(triphenylphosphine) palladium (II) (60 mg, 0.32 mmol). 4-Ethynyl-2-(methylsulfanyl)pyrimidine (example 4, 0.75 g, 4.9 mmol) in tetrahydrofuran was added dropwise to the resulting solution. After the addition was complete the reaction was stirred at room temperature overnight. The mixture was concentrated to give a syrup, that was purified by silica gel chromatography (1:1 ethyl acetate:hexane) to give after removal of solvents 0.84 g (70%) of 4-[(2-fluoro-4-pyridinyl)ethynyl]-2-(methylsulfanyl)pyrimidine as a white solid. 1H NMR (CDCl3): δ 8.61 (d, 1H), 8.32 (d, 1H), 7.39 (d, 1H), 7.17 (m, 2H), 2.64 (s, 3H); 19F NMR (CDCl3): 8–66.82; MS m/z 246 (M+1).

1. additionAfter the addition
2. concentrationThe mixture was concentrated
3. customto give a syrup, that
4. customwas purified by silica gel chromatography (1:1 ethyl acetate:hexane)
5. customto give
6. customafter removal of solvents 0.84 g (70%) of 4-[(2-fluoro-4-pyridinyl)ethynyl]-2-(methylsulfanyl)pyrimidine as a white solid