Pyridine → N-(5-{[2-(acetylamino)-1,3-benzothiazol-6-yl]oxy}-2-methylphenyl)-3-(1-cyano-1-methylethyl)benzamide

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Reaction Steps

To a solution of N-{5-[(2-amino-1,3-benzothiazol-6-yl)oxy]-2-methylphenyl}-3-(1-cyano-1-methylethyl)benzamide (200 mg, 0.452 mmol) produced in Example A7(vii) in tetrahydrofuran (2.0 mL) were added pyridine (180 μL, 2.25 mmol) and acetyl chloride (51 μL, 0.723 mmol), and the mixture was stirred at room temperature for 2 hr. The reaction mixture was diluted with ethyl acetate (20 mL), washed with 5% aqueous sodium hydrogencarbonate solution (10 mL) and saturated brine (10 mL), successively, 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 basic silica gel column chromatography (hexane/ethyl acetate=50/50→0/100), and the obtained solution was concentrated under reduced pressure. The residue was recrystallized from 2-butanone/hexane to give the title compound (138 mg, 63%) as colorless crystals.

Provenance & Evidence