Imidazo(1,2-a)pyridine-3-carboxylic acid → N-(3-ethyl-1-((2-methoxy-6-methylpyridin-3-yl)methyl)-1H-indazol-4-yl)imidazo[1,2-a]pyridine-3-carboxamide

Participants

Reaction Steps

To imidazo[1,2-a]pyridine-3-carboxylic acid (118 mg, 0.729 mmol) was added a mixture of 3:1 DCM/thionyl chloride (4 mL). The mixture was stirred at ambient temperature for 3 hours and then concentrated to a residue under N2 stream. The residue was dried under high vacuum for 30 minutes. 3-Ethyl-1-((2-methoxy-6-methylpyridin-3-yl)methyl)-1H-indazol-4-amine (108 mg, 0.364 mmol) in THF/DCE (1:1; 8 mL) was added to the dry acid-chloride residue. The reaction mixture was heated at 75° C. for 30 minutes. The mixture was concentrated under reduced pressure and diluted with DCM. The solution was washed with saturated NaHCO3 aqueous solution, dried (Na2SO4) and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 5% MeOH 0.5% NH4OH in DCM to give the product (57.6 mg).

Provenance & Evidence