[Br:1][C:2]1[CH:3]=[N:4][N:5]2[CH:10]=[CH:9][C:8]([CH:11](Br)[CH3:12])=[CH:7][C:6]=12.[CH3:14][NH:15][C:16]1[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][N:17]=1.C([O-])([O-])=O.[K+].[K+].O>C(#N)C>[Br:1][C:2]1[CH:3]=[N:4][N:5]2[CH:10]=[CH:9][C:8]([CH:11]([N:15]([CH3:14])[C:16]3[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][N:17]=3)[CH3:12])=[CH:7][C:6]=12
A suspension of 3-bromo-5-(1-bromoethyl)pyrazolo[1,5-a]pyridine (I-18, 400 mg, 1.32 mmol), N,5-dimethylpyridin-2-amine (230 mg, 1.98 mmol) and K2CO3 (546 mg, 3.96 mmol) in acetonitrile was heated to 90° C. in a sealed tube for overnight. The reaction mixture was cooled to room temperature and water (10 mL) was added. The aqueous phase was extracted with ethyl acetate (2×10 mL). The combined organic layers were dried over Na2SO4 and solvents were removed under reduced pressure. The resulting crude product was purified by column chromatography over silica gel (petroleum ether/EtOAc, 0-4% EtOAc) to afford 210 mg (46%) of N-(1-(3-bromopyrazolo[1,5-a]pyridin-5-yl)ethyl)-N,5-dimethylpyridin-2-amine (I-19) as a yellow solid. ESI-LC/MS (m/z): [M+H]+ 345.2, [(M+2)+H]+ 347, RT 3.31 min.
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