反应详情

Bis(triphenylphosphine)palladium(II) dichloride (54 mg, 0.076 mmol) was dissolved in degassed tetrahydrofuran (5 mL) Diisobutylaluminum hydride (1M in hexanes, 0.15 mL, 0.15 mmol) was added and the mixture was stirred for 15 minutes. 6-Methyl-2-pyridylzinc bromide (0.5 M in tetrahydrofuran, 2.29 mL, 1.15 mmol) and a solution of (4-chloro-phenyl)-(6-chloro-pyrazin-2-yl)-carbamic acid tert-butyl ester (260 mg, 0.76 mmol) in tetrahydrofuran (3 mL) was added and the mixture was stirred at room temperature over night. The reaction was quenched with aqueous sodium hydrogen carbonate. The aqueous phase was extracted with ethyl acetate (4×15 mL). The combined organic phases were washed with brine, dried over anhydrous sodium sulphate, filtrated and evaporated. The crude product was purified by column chromatography (ethyl acetate/heptane as eluent) to give (4-chloro-phenyl)-[6-(6-methyl-pyridin-2-yl)-pyrazin-2-yl]-carbamic acid tert-butyl ester (113 mg, 23%) as a yellow solid.

1. additionwas added
2. stirringthe mixture was stirred at room temperature over night
3. customThe reaction was quenched with aqueous sodium hydrogen carbonate
4. extractionThe aqueous phase was extracted with ethyl acetate (4×15 mL)
5. washThe combined organic phases were washed with brine
6. dry with materialdried over anhydrous sodium sulphate
7. filtrationfiltrated
8. customevaporated
9. customThe crude product was purified by column chromatography (ethyl acetate/heptane as eluent)