Triethylamine → Benzyl (2-fluoro-4-{2-[3-methyl-3-(1-methylpiperidin-4-yl)ureido]pyridin-4-yloxy}phenyl)carbamate

Participants

Reaction Steps

To a solution of Benzyl [4-(2-aminopyridin-4-yloxy)-2-fluorophenyl]carbamate (200 mg) in tetrahydrofuran (5.0 ml) was added triethylamine (0.197 ml), and then phenyl chloroformate (0.107 ml) was added dropwise thereto, followed by stirring at room temperature for 10 min. The reaction mixture was concentrated under a reduced pressure to give a residue, to which N,N-dimethylformamide (2.0 ml) and 1-methyl-4-(methylamino)piperidine (0.329 ml) were then added, followed by stirring at room temperature for 18 hrs. To the reaction mixture was added ethyl acetate (50 ml) and water (30 ml) to partition. The organic layer was washed with brine (30 ml×3), and dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, which was then purified by silica gel column chromatography (FUJI Silysia NH, heptane:ethyl acetate=1:2, ethyl acetate, then ethyl acetate:methanol=20:1 to 10:1) to provide the titled compound (117 mg, 40.7%) as pale yellow powder.

Provenance & Evidence