Triethylamine → 4-cyano-6-(3-fluorophenyl)-N,N,5-trimethyl-7-[(3S)-3-methyl-3-(methylamino)pyrrolidin-1-yl]-1,3-benzoxazole-2-carboxamide

Participants

Reaction Conditions

Reaction Steps

A dimethyl sulfoxide (0.5 ml) solution of the above-mentioned tert-butyl methyl[(3S)-3-methylpyrrolidin-3-yl]carbamate (I-348) and triethylamine (172 μl, 1.23 mmol) was added to a dimethyl sulfoxide (4.5 ml) solution of 4-cyano-7-fluoro-6-(3-fluorophenyl)-N,N,5-trimethyl-1,3-benzoxazole-2-carboxamide (I-184) (300 mg, 0.878 mmol) stirred in an oil bath at 150° C., followed by stirring in an oil bath at 150° C. for 30 minutes. The reaction liquid was concentrated under reduced pressure, the residue was dissolved in ethyl acetate, and washed with water and saturated brine. After drying over anhydrous sodium sulfate, the insoluble matter was separated by filtration, and the residue obtained by concentration was purified by silica gel column chromatography (eluent, n-hexane:ethyl acetate=1:1→1:2, v/v). The obtained yellow foamy substance was dissolved in dichloromethane (3 ml), and with cooling with ice, trifluoroacetic acid (6 ml) was added, followed by stirring at room temperature for 8 hours. The reaction liquid was concentrated under reduced pressure, then an aqueous saturated sodium hydrogencarbonate solution was added, followed by extraction with chloroform. After drying over anhydrous sodium sulfate, the insoluble matter was separated by filtration, the residue obtained by concentration was purified by preparative TLC (eluent, chloroform:methanol=10:1, v/v), and the obtained eluate was purified in slurry with a mixed solvent of isopropyl ether and hexane to obtain the entitled compound (80.0 mg, 21%) as a pale yellow solid.

Provenance & Evidence