反应详情

温度

110 °C

A mixture of 3.18 g of caesium carbonate, 25 mL of dioxane, 9.3 mL of water, 500 mg of 2-iodopyridine, 89 mg of [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium and 848 mg of ethyl 6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)imidazo[1,2-a]pyridine-2-carboxylate hydrobromide (1:1) is heated for 2 hours at 110° C., and then partially concentrated, diluted with dichloromethane and filtered. The organic phase is washed with water and dried over magnesium sulfate, filtered and concentrated to dryness under reduced pressure. The residue is chromatographed on a silica cartridge, eluting with a mixture of dichloromethane and cyclohexane (80/20). The fractions containing the expected product are combined and concentrated to dryness under reduced pressure to give 317 mg of ethyl 6-(pyrid-2-yl)imidazo[1,2-a]pyridine-2-carboxylate in the form of a brown oil.

1. concentrationpartially concentrated
2. additiondiluted with dichloromethane
3. filtrationfiltered
4. washThe organic phase is washed with water
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated to dryness under reduced pressure
8. customThe residue is chromatographed on a silica cartridge
9. washeluting with a mixture of dichloromethane and cyclohexane (80/20)
10. additionThe fractions containing the expected product
11. concentrationconcentrated to dryness under reduced pressure