Triethylamine → N-[4-({2-[(Azetidin-1-ylcarbonyl)amino]pyridin-4-yl}oxy)-2,5-difluorophenyl]-N'-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide

Participants

Reaction Steps

N-{4-[(2-Aminopyridin-4-yl)oxy]-2,5-difluorophenyl}-N′-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide (100.0 mg) was dissolved in tetrahydrofuran (1 ml) under a nitrogen atmosphere, and triethylamine (0.0630 ml) and phenyl chloroformate (0.0624 ml) were added dropwise at 0° C. in this order, followed by stirring for 30 min. The reaction mixture was stirred after addition of ethyl acetate (5 ml) and a saturated aqueous solution of sodium hydrogencarbonate (5 ml). The organic layer was separated, washed with brine, and dried over anhydrous sodium sulfate. The solvent was concentrated under reduced pressure. The residue was dissolved in N,N-dimethylformamide (1.0 ml). Triethylamine (0.315 ml) and azetidine hydrochloride (84.6 mg) were added at room temperature, followed by stirring for 16.5 hr. The reaction mixture was partitioned between ethyl acetate (10 ml) and a saturated aqueous solution of sodium hydrogencarbonate (5 ml). The organic layer was washed with brine, and dried over anhydrous sodium sulfate. The solvent was concentrated under reduced pressure. To the residue were added ethyl acetate (3 ml) and heptane (3 ml) to precipitate a solid. The solid was collected by filtration. The resultant solid was washed with heptane:ethyl acetate=1:1, dried under hot air at 60° C. for 4 hr to provide the titled compound as white powder (94.0 mg, 79%).

Provenance & Evidence