Oxalyl chloride → N-(5-{[2-(acetylamino)[1,3]thiazolo[5,4-b]pyridin-5-yl]oxy}-2-chlorophenyl)-2-chloro-3-(1-cyano-1-methylethyl)benzamide

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Reaction Steps

2-Chloro-3-(1-cyano-1-methylethyl)benzoic acid (120 mg, 0.537 mmol) produced in Example C61(v) was dissolved in tetrahydrofuran (3.0 mL) and N,N-dimethylformamide (0.01 mL), oxalyl chloride (56.87 μL, 0.672 mmol) was added, and the mixture was stirred at room temperature for 1 hr. The reaction mixture was concentrated under reduced pressure, toluene (10 mL) was added to the residue, and the mixture was again concentrated under reduced pressure. The residue was dissolved in N,N-dimethylacetamide (3.0 mL), N-[5-(3-amino-4-chlorophenoxy)[1,3]thiazolo[5,4-b]pyridin-2-yl]acetamide (90 mg, 0.269 mmol) was added to the reaction mixture, and the mixture was stirred at room temperature for 2 hr. The reaction mixture was diluted with ethyl acetate (80 mL), the organic layer was washed with aqueous sodium hydrogen carbonate solution (50 mL), dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane=40/60→100/0), further purified by basic silica gel column chromatography (ethyl acetate/hexane=50/50→100/0→ethyl acetate/methanol=90/10), and crystallized from diethyl ether to give the title compound (81 mg, 56%) as white crystals.

Provenance & Evidence