反应详情

温度

40 °C

Ethyl 2-bromo-4-chloropyridine-3-carboxylate (1.5 g, 5.7 mmol) was dissolved in anhydrous dioxane (45 mL). A solution of diethyl zinc (4.6 mL, 5.1 mmol, 1.1 M in toluene) was added dropwise, and then was added (1,1′-bis(diphenylphosphino)ferrocene)dichloropalladium (62 mg, 85 μmol). The mixture was heated at 40° C. overnight, and then water plus 1 N HCl were added. The reaction mixture was extracted 3 times with ethyl acetate. The combined organic phase was washed with brine and dried over sodium sulfate. After evaporation, the residue was dissolved in DCM and purified on silica gel using 0-15% hexane/ethyl acetate to afford ethyl 4-chloro-2-ethylpyridine-3-carboxylate (687 mg, 57% yield).

1. extractionThe reaction mixture was extracted 3 times with ethyl acetate
2. washThe combined organic phase was washed with brine
3. dry with materialdried over sodium sulfate
4. customAfter evaporation
5. dissolutionthe residue was dissolved in DCM
6. custompurified on silica gel using 0-15% hexane/ethyl acetate