Sodium Carbonate → 5-Methyl-6-(pyridin-3-yl) imidazo[1,2-a]pyridine-3-carbaldehyde

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Reaktionsschritte

6-bromo-5-methylimidazo[1,2-a]pyridine-3-carbaldehyde (125 mg, 0.523 mmol), Pyridine-3-boronic acid (77.5 mg, 0.603 mmol), dichlorobis(triphenylphosphine) palladium (II) (36.7 mg, 0.05 mmol) and 2M aqueous Na2CO3 (2 ml) were dissolved in DMF (3 ml) and refluxed for 2 hours. The reaction mixture was diluted with ethyl acetate and washed with water and brine. The solvent was evaporated to obtain crude product, which was purified by column chromatography (silica gel, 0.5% methanol in chloroform) to obtain the title compound. Yield: 40%; 1H NMR (DMSO-d6; 300 MHz): 69.90(s, 1H), 8.39 (s, 1H), 7.73 (d, 1H, J=9.6 Hz), 7.56 (d, 1H, J=9.3 Hz), 3.11 (s, 3H); MS: m/z 238 (M+1)+.

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