Dimethylformamide → N-(1-benzyl-5-chloro-3-ethyl-1H-indazol-4-yl)-7-(2-methoxyethoxy)imidazo[1,2-a]pyridine-3-carboxamide

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Reaction Steps

To a magnetically stirred, ice cooled, suspension of 7-(2-methoxyethoxy)imidazo[1,2-a]pyridine-3-carboxylic acid (6.76 mg, 0.0286 mmol) (prepared as in Example 1, steps A-D) in dichloromethane (1 mL) was added N,N-dimethylformamide (1 μL) followed by oxalyl chloride (18.3 μL, 0.0365 mmol; 2M solution in dichloromethane). The mixture was allowed to warm to ambient temperature with occasional venting to allow gases to evolve. After stirring for 30 minutes, 1-benzyl-5-chloro-3-ethyl-1H-indazol-4-amine (8.70 mg, 0.0304 mmol) was added as a solution in dichloromethane (0.5 mL). The mixture was stirred for 60 minutes and then concentrated under reduced pressure. The material was purified using preparative thin layer chromatography on silica, eluting with 5% methanol in dichloromethane to give N-(1-benzyl-5-chloro-3-ethyl-1H-indazol-4-yl)-7-(2-methoxyethoxy)imidazo[1,2-a]pyridine-3-carboxamide (5.4 mg). MS (APCI), positive scan, m/z=504.3 (M+H).

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