反应详情

To a suspension of 200 mg of 6-formyl-N-phenylimidazo[1,2-a]pyridine-2-carboxamide (Intermediate 8) in 10 mL of methanol are added 104 mg of potassium carbonate and 147 mg of para-toluenesulfonylmethylisonitrile (TOSMIC). The reaction mixture is refluxed for 2 hours and then evaporated to dryness under reduced pressure, taken up in 300 mL of dichloromethane and washed with water. The organic phase is dried and concentrated to dryness on silica and then chromatographed on a silica cartridge, eluting with a gradient of from 0 to 20% of methanol in dichloromethane. The fractions containing the expected product are concentrated to dryness and the solid obtained is triturated with a small amount of dichloromethane, filtered off and dried to give 80 mg of 6-(oxazol-5-yl)-N-phenylimidazo[1,2-a]pyridine-2-carboxamide in the form of a white solid.

1. temperatureThe reaction mixture is refluxed for 2 hours
2. customevaporated to dryness under reduced pressure
3. washwashed with water
4. customThe organic phase is dried
5. concentrationconcentrated to dryness on silica
6. customchromatographed on a silica cartridge
7. washeluting with a gradient of from 0 to 20% of methanol in dichloromethane
8. additionThe fractions containing the expected product
9. concentrationare concentrated to dryness
10. customthe solid obtained
11. customis triturated with a small amount of dichloromethane
12. filtrationfiltered off
13. customdried