Piperidine → HCID 57677479, compound

Participants

Reaction Steps

4-(4-Amino-3-chlorophenoxy)pyridin-2-ylamine (750 mg, 3.18 mmol) was dissolved in tetrahydrofuran (30 ml), and then triethylamine (0.444 ml, 4.77 mmol) was added thereto. Phenyl chloroformate (0.399 ml, 4.77 mmol) was added dropwise thereto while ice-cooling, followed by stirring at room temperature for 3.5 hrs. Triethylamine (0.444 ml) and phenyl chloroformate (0.399 ml) were further added thereto while ice-cooling, followed by stirring for 15 min. N,N-dimethylformamide (6.0 ml) and piperidine (1.5 ml) were added thereto, followed by stirring at room temperature for 5.5 hrs. The reaction mixture was concentrated under a reduced pressure, and then N,N-dimethylformamide (4.0 ml) and piperidine (1.0 ml) were added thereto, followed by stirring at room temperature for 36 hrs. The reaction mixture was partitioned between ethyl acetate and water. The organic layer was washed with brine, and dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, which was then purified by silica gel column chromatography (eluent; hexane:ethyl acetate=1:1 to 1:2, ethyl acetate, then ethyl acetate:methanol=10:1). Fractions containing the target compound were concentrated to give a solid, which was suspended in diethyl ether, filtered, and dried under aeration to provide the titled compound (462 mg, 1.33 mmol, 41.9%) as a pale yellow solid.

Provenance & Evidence