Cl[Si](C)(C)C.[I-].[Na+].C[O:9][C:10]1[CH:15]=[CH:14][N:13]=[C:12]([C:16]2[CH:17]=[N:18][N:19]3[CH:24]=[CH:23][C:22]([C:25]#[N:26])=[CH:21][C:20]=23)[N:11]=1>C(#N)C>[OH:9][C:10]1[CH:15]=[CH:14][N:13]=[C:12]([C:16]2[CH:17]=[N:18][N:19]3[CH:24]=[CH:23][C:22]([C:25]#[N:26])=[CH:21][C:20]=23)[N:11]=1Chlorotrimethylsilane (0.61 mL, 4.83 mmol) and sodium iodide (0.72 g, 4.83 mmol) were added to a stirred suspension of 3-(4-methoxypyrimidin-2-yl)pyrazolo[1,5-a]pyridine-5-carbonitrile (Preparation 3a, 0.14 g, 0.54 mmol) in acetonitrile (11 mL) and the mixture was heated at 70° C. in a sealed tube and left overnight. The mixture was then cooled and the solvent evaporated. Water (4 mL) and 10% aqueous sodium thiosulfate solution (5 mL) were added to the residue and the suspension was stirred for 20 minutes. The suspension was filtered and the precipitate was dried in vacuo to give the title compound in quantitative yield which was used in the next synthetic step without further purification.
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