N-bromobutanimide → HCID 19434932, compound

Participants

Reaction Steps

2.50 g (11.9 mmol) of 5-amino-2-(4-aminophenyl)-4H-1-benzopyran-4-one (EP-A-374789) was dissolved in 75 ml of dioxane, 1.86 g (13.1 mmol) of N-bromosuccinimide was added and the mixture was stirred at room temperature for 2 hours. The reaction solution was concentrated under reduced pressure, and the residue was extracted with a mixed solution of chloroform and methanol. The extract was washed with an aqueous saturated solution of sodium chloride and dried over anhydrous sodium sulfate. The organic layer was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (chloroform/acetone=40:1) to give 767 mg (20%) of Compound 5.

Provenance & Evidence