反应详情

温度

60 °C

Triphenylphosphine (126 mg, 0.48 mmol), bis(triphenylphosphine)palladium(II) chloride (1.01 g, 1.44 mmol) and triethylamine (3.65 g, 101.2 mmol) were dissolved in 40 ml of dry THF. This mixture was evacuated and backfilled with argon several times to remove oxygen from the solution. 4-iodo-2-methyl-1H-imidazole [Tetrahedron Letters 30(11), 1409 (1989)] (5.0 g, 20.8 mmol), 4-trimethylsilanylethynyl-pyridine-2-carbonitrile (4.43 g, 22.1 mmol) and copper (I) iodide (46 mg, 0.24 mmol) were added and the mixture was warmed to 60° C. A 1M solution of tetrabutylammonium fluoride (24 ml, 24.0 mmol) was added dropwise over a period of 30 min. After the addition was finished, the reaction mixture was stirred at 60° C. for another hour. The solvent was evaporated. The residue was taken up in 200 mL water and extracted three times with 200 ml of ethyl acetate. The combined organic extracts were dried with magnesium sulfate, filtered and evaporated. The crude product was purified by flash chromatography on silica gel (methanol/methylene chloride 5:95). The desired product was obtained as a light yellow solid (1.06 g, 21%). MS: m/e=208.9 (M+).

1. customThis mixture was evacuated
2. customto remove oxygen from the solution
3. additionAfter the addition
4. customThe solvent was evaporated
5. extractionextracted three times with 200 ml of ethyl acetate
6. dry with materialThe combined organic extracts were dried with magnesium sulfate
7. filtrationfiltered
8. customevaporated
9. customThe crude product was purified by flash chromatography on silica gel (methanol/methylene chloride 5:95)