Lithium Hexamethyldisilazide → N-(3-iodo-1-((2-methylthiazol-5-yl)methyl)-1H-indazol-4-yl)-7-(2-(4-methylpiperazin-1-yl)ethoxy)imidazo[1,2-a]pyridine-3-carboxamide

Participants

Reaction Steps

A solution of 3-iodo-1-((2-methylthiazol-5-yl)methyl)-1H-indazol-4-amine (40 mg, 0.11 mmol) in anhydrous THF (3 mL) was treated at ambient temperature under a nitrogen atmosphere with lithium bis(trimethylsilyl)amide (1.0 M in THF, 0.24 mL). The resulting brown solution was added dropwise to a cooled (ice-water) solution of ethyl 7-(2-(4-methylpiperazin-1-yl)ethoxy)imidazo[1,2-a]pyridine-3-carboxylate (35.9 mg, 0.11 mmol) in anhydrous THF (3 mL). The reaction mixture was allowed to warm to ambient temperature, and was diluted with water (10 ml). The resulting mixture was extracted thoroughly with ethyl acetate and dichloromethane. The combined organic extracts were dried over sodium sulfate, the solids removed by filtration, and the filtrate was concentrated to afford an oil. The crude oil was subjected to preparative thin-layer chromatography on silica with MeOH/DCM as the eluent to afford 11.6 mg of the desired product.

Provenance & Evidence