2-Amino-4-chloropyridine → HCID 23153342, compound

Participants

Reaction Conditions

Reaction Steps

2-Amino-4-chloropyridine (257 mg) was dissolved in 2-ethoxyethanol (10 ml), and then benzyl N-(4-aminophenyl)carbamate (533 mg) and pyridine hydrochloride (462 mg) were added thereto, followed by stirring at 120° C. overnight. The reaction mixture was cooled down to room temperature, and partitioned between ethyl acetate and a saturated aqueous solution of sodium hydrogencarbonate. The organic layer was washed with brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under a reduced pressure to give a residue, which was then purified by silica gel column chromatography (Fuji Silysia NH, eluent; ethyl acetate, then ethyl acetate:methanol=95:5). Fractions containing the target compound were concentrated to give a residue, to which ethyl acetate-hexane was then added to precipitate crystals. The solid was filtered, and dried under aeration to provide the titled compound (321.5 mg, 48%) as pale brown crystals.

Provenance & Evidence