Phosphorus pentachloride → HCID 59443043, compound

Participants

Reaction Steps

Phosphorus pentachloride (5.5 g) was added to a solution of 2,2-dimethyl-7-nitro-3,4-dihydro-2H-1,3-benzoxazine-4-one (4 g) in phosphoryl chloride (15 mL) at 0° C., and the mixture was stirred at room temperature for one hour. The mixture was heated to 60° C. and stirred at the same temperature overnight. After cooling to 0° C., the reaction mixture was poured into ice water (300 mL). After stirring for 30 minutes, the mixture was extracted with ethyl acetate (100 mL×2). The combined organic layer was washed with brine (100 mL×2), dried over sodium sulfate and concentrated in vacuo to give the titled compound (2.34 g) as a brown oil, which was used in the next step without further purification.

Provenance & Evidence