Picolinic acid → N-{6-[5-({[3-(1-cyano-1-methylethyl)phenyl]carbonyl}amino)-2-methylphenoxy][1,2,4]triazolo[1,5-a]pyridin-2-yl}pyridine-2-carboxamide

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Reaction Steps

To a solution of pyridine-2-carboxylic acid (234 mg, 1.90 mmol) in tetrahydrofuran (6 mL) were added oxalyl chloride (206 μL, 2.38 mmol) and N,N-dimethylformamide (20 μL), and the mixture was stirred at room temperature for 1 hr. The reaction mixture was concentrated under reduced pressure. The obtained residue and N-{3-[(2-amino[1,2,4]triazolo[1,5-a]pyridin-6-yl)oxy]-4-methylphenyl}-3-(1-cyano-1-methylethyl)benzamide (203 mg, 0.475 mmol) were dissolved in pyridine (7 mL), and the mixture was stirred at room temperature for 23 hr. A saturated aqueous sodium hydrogen carbonate solution (50 mL) was added to the reaction mixture, and the mixture was extracted with ethyl acetate (50 mL, 20 mL). The combined organic layer was washed with saturated brine (10 mL) and dried over anhydrous sodium sulfate. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (NH silica gel, hexane/ethyl acetate=40/60→20/80), and fractions containing the desired product were concentrated under reduced pressure. The crystals precipitated during concentration were collected by filtration and dried to give the title compound (146 mg, 58%) as colorless crystals.

Provenance & Evidence