Triethylamine → 7-[(3S)-3-(Dimethylamino)pyrrolidin-1-yl]-5-methyl-6-phenyl-2-(pyrazin-2-yl)-1,3-benzoxazole-4-carbonitrile

Participants

Reaction Conditions

Reaction Steps

(3S)-3-(Dimethylamino)pyrrolidine (93.4 μl, 0.736 mmol) and triethylamine (121 μl, 0.866 mmol) were added to a dimethyl sulfoxide (4 ml) solution of 7-fluoro-5-methyl-6-phenyl-2-(pyrazin-2-yl)-1,3-benzoxazole-4-carbonitrile (I-187) (143 mg, 0.433 mmol), followed by stirring in an oil bath at 95° C. for 0.2 hours. The reaction liquid was concentrated under reduced pressure, the residue was dissolved in chloroform (100 ml), washed with saturated brine (50 ml). After drying over anhydrous sodium sulfate, the solvent was evaporated away, and the resulting residue was purified by silica gel column chromatography (eluent, chloroform:methanol=9:1), the eluate was recrystallized from isopropanol to obtain the entitled compound (71.0 mg, 38.6%) as a pale yellow acicular crystal.

Provenance & Evidence