Trifluoroacetic acid → N-(1-{4-Cyano-7-[(3S)-3-(dimethylamino)pyrrolidin-1-yl]-5-methyl-6-phenyl-1,3-benzoxazol-2-yl}azetidin-3-yl)methanesulfonamide

Participants

Reaction Steps

With cooling with ice, trifluoroacetic acid (1 ml) was added to a dichloromethane (2 ml) solution of tert-butyl (1-{4-cyano-7-[(3S)-3-(dimethylamino)pyrrolidin-1-yl]-5-methyl-6-phenyl-1,3-benzoxazol-2-yl}azetidin-3-yl)carbamate (I-195) (77.6 mg, 0.15 mmol), followed by stirring with cooling with ice for 1 hour. The reaction liquid was concentrated under reduced pressure, dissolved in dichloromethane (2 ml), and with cooling with ice, triethylamine (210 ml, 1.52 mmol) and methanesulfonyl chloride (25.6 μl, 0.33 mmol) were added, followed by stirring at room temperature for 1 hour. The reaction liquid was concentrated under reduced pressure, the residue was dissolved in chloroform (50 ml), and washed with saturated brine (50 ml). After drying over anhydrous sodium sulfate and concentration, the resulting residue was purified by preparative TLC (eluent, chloroform:methanol=10:1) to obtain the entitled compound (15.0 mg, 19.7%) as a colorless solid.

Provenance & Evidence