Dimethyl Sulfoxide → 4-cyano-N-[2-(dimethylamino)-2-oxoethyl]-7-[(3S)-3-(dimethylamino)pyrrolidin-1-yl]-N,5-dimethyl-6-phenyl-1,3-benzoxazole-2-carboxamide

Participants

Reaction Steps

Under nitrogen atmosphere, a dimethyl sulfoxide (1 ml) solution of (3S)-3-(dimethylamino)pyrrolidine (52 μl, 408 μmol) was added at 150° C. to a dimethyl sulfoxide (6 ml) solution of 4-cyano-N-[2-(dimethylamino)-2-oxoethyl]-7-fluoro-N,5-dimethyl-6-phenyl-1,3-benzoxazole-2-carboxamide (I-125) (134 mg, 340 μmol) and triethylamine (62 μl, 442 μmol), followed by stirring at the same temperature for 50 minutes. After cooling, saturated brine was added to the reaction liquid, and the reaction liquid was extracted with ethyl acetate. Next, the combined organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated under reduced pressure. The resulting residue was subjected to silica gel column chromatography, and the eluate with dichloromethane/methanol (20:1, v/v) gave the entitled compound (24 mg, 14%) as an amorphous substance.

Provenance & Evidence