Formaldehyde → 3-(1-cyano-1-methylethyl)-N-[3-({2-[(cyclopropylcarbonyl)amino]-7-(dimethylamino)-1,3-benzothiazol-6-yl}oxy)phenyl]benzamide

Participants

Reaction Steps

To a solution of N-[3-({7-amino-2-[(cyclopropylcarbonyl)amino]-1,3-benzothiazol-6-yl}oxy)phenyl]-3-(1-cyano-1-methylethyl)benzamide (100 mg, 0.195 mmol) produced in Example 43 in acetic acid (2 mL) were added para-formaldehyde (36 mg, 1.19 mmol) and sodium cyanoborohydride (45 mg, 0.644 mmol), and the mixture was stirred at room temperature for 12 hr. The reaction mixture was diluted with ethyl acetate (10 mL), washed successively with saturated aqueous sodium hydrogen carbonate solution (10 mL) and saturated brine (10 mL), and dried over anhydrous sodium sulfate. Insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by basic silica gel column chromatography (ethyl acetate/n-hexane=20/80→80/20), and the obtained solution was concentrated under reduced pressure. The residue was crystallized from ethyl acetate/n-hexane to give the title compound (72 mg, 68%) as a white powder.

Provenance & Evidence