Pyridine → HCID 68695860, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 6-(4-methylpiperazin-1-yl)-3-nitropyridin-2-amine (1.2 g, 5.0 mmol) in hydrogen fluoride.pyridine (15 mL) is cooled to 0° C. in an ice-water bath. Sodium nitrite (0.36 g, 5.2 mmol) is added in a single portion, and the mixture is stirred for 30 minutes at 0° C. The bath is removed and the mixture is heated for 15 minutes in an oil bath on a 70° C. hot plate. After cooling to room temperature, the reaction mixture is poured onto ice (50 g), neutralized with saturated aqueous sodium hydrogen carbonate solution, and basified with 10 N sodium hydroxide solution. The mixture is extracted 3× with dichloromethane, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. Eighty-percent of the crude residue is purified by reverse-phase HPLC to give 1-(6-fluoro-5-nitropyridin-2-yl)-4-methylpiperazine.trifluoroacetic acid salt (0.40 g, 29%).

Provenance & Evidence