反应详情

温度

60 °C

To a magnetically stirring solution of 5,6 dichloronicotinic acid (2.7 g, 14.06 mmol) in THF (70.0 mL), was added isobutyronitrile (6.37 mL, 69.66 mmol) followed by potassium hexamethyldisilazide 0.5 M in toluene (70 mL). The resulting orange mixture was stirred at 60° C. overnight. Solvents were removed and residue portioned between ethyl acetate (100 mL) and 1N HCl (100 mL). The layers of the resulting reaction mixture were separated and the aqueous layer was extracted three additional times with ethyl acetate. The organic layers were combined and dried over Na2SO4, filtered and concentrated in vacuo to a yellow solid (3.34 g). This crude residue was dissolved in THF (80 mL) and reaction cooled to 0° C. BH3.THF 1 M solution in THF (22.30 mL) was added and reaction stirred at 0° C. for 4 hours, then room temperature overnight. Solid K2CO3 (2 g) and water (100 mL) were added and the aqueous layer was extracted three additional times with ethyl acetate. The organics were combined dried over Na2SO4, filtered and concentrated in vacuo to a clear oil which was purified by silica gel chromatography (hexanes) to give the title compound as a white solid (0.95 g, 32%). ESIMS (MH+): 210.

1. customSolvents were removed
2. customThe layers of the resulting reaction mixture
3. customwere separated
4. extractionthe aqueous layer was extracted three additional times with ethyl acetate
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo to a yellow solid (3.34 g)
8. dissolutionThis crude residue was dissolved in THF (80 mL)
9. customreaction
10. temperaturecooled to 0° C
11. customreaction
12. stirringstirred at 0° C. for 4 hours
13. customroom temperature overnight
14. extractionthe aqueous layer was extracted three additional times with ethyl acetate
15. dry with materialThe organics were combined dried over Na2SO4
16. filtrationfiltered
17. concentrationconcentrated in vacuo to a clear oil which
18. customwas purified by silica gel chromatography (hexanes)