Phosphorus tribromide → HCID 68576825, compound

Participants

Reaction Steps

To a solution of ethyl 8-fluoro-6-(methoxy)-4-oxo-1,4-dihydro-3-quinolinecarboxylate (12 g, 45 mmol) in DMF (56 ml) was added dropwise phosphorus tribromide (4.5 ml, 47 mmol) over fifteen minutes (slightly exothermic). The reaction was held at 0° C., with an ice bath, for one hour and allowed to warm to room temperature then stirred for a further 2 hours. The mixture was then diluted with water (400 mL). A solution of sodium bicarbonate was added to reach pH 7. The reaction mixture was stirred for one hour at 0° C. then filtered. The precipitate was washed with water and dried in vacuo to afford the product as a yellow solid (12.2 g, 82%).

Provenance & Evidence