Triethylamine → 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

Participants

Reaction Conditions

Reaction Steps

(3S)-3-(Dimethylamino)pyrrolidine (180 μl, 1.42 mmol) and triethylamine (238 μl, 1.70 mmol) were added to a dimethyl sulfoxide (5 ml) solution of tert-butyl [1-(4-cyano-7-fluoro-5-methyl-6-phenyl-1,3-benzoxazol-2-yl)azetidin-3-yl]carbamate (I-194) (400 mg, 0.947 mmol), followed by stirring in an oil bath at 130° C. for 3 hours. The reaction liquid was concentrated under reduced pressure, the residue was dissolved in chloroform (100 ml) and washed with saturated brine (100 ml). After drying over anhydrous sodium sulfate and concentration, the resulting residue was purified by silica gel column chromatography (eluent, chloroform:methanol=10:1) to obtain the entitled compound (260 mg, 53.2%) as a colorless solid.

Provenance & Evidence