Sodium Hydroxide → HCID 54710167, compound

Participants

Reaction Steps

Phosphorus trichloride (0.353 ml) was added dropwise to a water-cooled solution of N-methyl-4-fluoroaniline (3.04 g) in toluene (18 ml). The mixture was stirred at room temperature for 30 minutes. 6-Carboxy-2,3-dihydro-7-hydroxy-5-oxo-5H-pyrido[1,2,3-de]-1,4-benzoxazine (2 g) was added thereto, and the resulting mixture was stirred at 100° C. for 2 hours. Water (20 ml) and 4N sodium hydroxide (15 ml) were added thereto. The insoluble material was filtered and the filtrate was separated. The aqueous layer was acidified with hydrochloric acid and extracted with chloroform. The extract was dried over magnesium sulfate, filtered, and concentrated. The residue was recrystallized from a mixture of ethanol and isopropyl ether to give pale brown crystals of 2,3-dihydro-7-hydroxy-6-[N-(4-fluorophenyl)-N-methylcarbamoyl]-5-oxo-5H-pyrido[1,2,3-de]-1,4-benzoxazine (2.1 g).

Provenance & Evidence