反应详情

123 mg of 6-ethynyl-N-phenylimidazo[1,2-a]pyridine-2-carboxamide, 46 mg of sodium azide, 38 mg of ammonium chloride and 5 mL of N,N-dimethylformamide are placed in a microwave tube. The reaction mixture is heated for 20 minutes in a microwave machine set at 170° C. and then for a further 30 minutes under the same conditions, followed by addition of 46 mg of sodium azide and 38 mg of ammonium chloride, and finally concentrated at 50° C. under reduced pressure. The residue is taken up in 20 mL of ethyl acetate and 20 mL of water. The aqueous phase is extracted twice with 20 mL of ethyl acetate and the combined organic phases are washed with 30 mL of saturated brine and then dried over magnesium sulfate and concentrated to dryness under reduced pressure. The residue is chromatographed on a silica cartridge, eluting with a gradient of dichloromethane and methanol (from 100/0 to 90/10). The fractions containing the expected product are combined and concentrated to dryness under reduced pressure to give 36 mg of N-phenyl-6-(1H-1,2,3-triazol-4-yl)imidazo[1,2-a]pyridine-2-carboxamide in the form of an off-white solid.

1. temperatureThe reaction mixture is heated for 20 minutes in a microwave machine
2. customset at 170° C.
3. concentrationfinally concentrated at 50° C. under reduced pressure
4. extractionThe aqueous phase is extracted twice with 20 mL of ethyl acetate
5. washthe combined organic phases are washed with 30 mL of saturated brine
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated to dryness under reduced pressure
8. customThe residue is chromatographed on a silica cartridge
9. washeluting with a gradient of dichloromethane and methanol (from 100/0 to 90/10)
10. additionThe fractions containing the expected product
11. concentrationconcentrated to dryness under reduced pressure