Hydrogen Bromide → HCID 19434901, compound

Participants

Reaction Steps

6.10 g (11.9 mmol) of the resulting 2-[4-[N-acetyl-N-(6-bromohexyl)amino]-3-fluorophenyl]-5-amino-6,8-difluoro-4H-1-benzopyran-4-one was dissolved in 60 ml of dioxane, 40 ml of 47% aqueous HBr was added and the mixture was heated at reflux for 3 hours. The reaction solution was cooled on ice, water was added and the mixture was extracted with ethyl acetate. The organic layer was washed once with 5% aqueous sodium bicarbonate and once with an aqueous saturated solution of sodium chloride and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (chloroform:methanol=100:1) to give 3.53 g (63%) of 5-amino-2-[4-(6-bromohexylamino)-3-fluorophenyl]-6,8-difluoro-4H-1-benzopyran-4-one.

Provenance & Evidence