反应详情

温度

-78 °C

To a 1 L 3-neck round-bottomed flask equipped with addition funnel and nitrogen inlet were added 10.0 g (40 mmol) 2-bromo-6-(2,5-dimethylpyrrol-1-yl)pyridine and 200 mL dry tetrahydrofuran. The solution was cooled at −78° C., and a 1.6 M solution of butyl lithium in hexane (25 mL, 40 mmol) was added dropwise over 10 min. The reaction was stirred at −78° C. for 20 min, then a 1.0 M solution of zinc chloride in ether (100 mL, 100 mmol) was added dropwise over 40 min keeping the temperature at −70° C. The reaction was then allowed to warm to room temperature, and 11.0 g (40 mmol) 2-(4-iodophenyl)ethylchloride was added, followed by 200 mg tetrakistriphenylphosphine palladium. The reaction was refluxed for 3 hours, cooled, and filtered through Celite. The filtrate was evaporated, and the residue taken up in ethyl acetate, washed with brine, dried over sodium sulfate, and evaporated. The residue was filtered through silica gel with methylene chloride, concentrated, and chromatographed on silica gel using 1% ethyl acetate in hexane as eluant to afford 7.3 g (59%) of the product as an oil.

1. customTo a 1 L 3-neck round-bottomed flask equipped with addition funnel and nitrogen inlet
2. customat −70° C
3. temperatureto warm to room temperature
4. temperatureThe reaction was refluxed for 3 hours
5. temperaturecooled
6. filtrationfiltered through Celite
7. customThe filtrate was evaporated
8. washwashed with brine
9. dry with materialdried over sodium sulfate
10. customevaporated
11. filtrationThe residue was filtered through silica gel with methylene chloride
12. concentrationconcentrated
13. customchromatographed on silica gel using 1% ethyl acetate in hexane as eluant