Chloroform → 2-bromo-N-(4-oxo-1-benzopyran-3-yl)-acetamide

Participants

Reaction Conditions

Reaction Steps

The starting material can be prepared for example as follows: 10 ml of chloroform are added to 8 g of 3-aminochromone in 200 ml of toluene and the mixture is warmed to 40° C. After cooling to 20° C., 10 ml of N,N-diisopropylethylamine are added with stirring, followed by the addition of 4.8 ml of bromoacetyl chloride in 20 ml of toluene at 10° C. in the course of 5 minutes. When the addition is complete, the reaction mixture is stirred for 1 hour at room temperature. The crystalline precipitate which has formed is collected by suction, washed with water and recrystallised from ethanol/petroleum ether, yielding 11.8 g of 2-bromo-N-(4-oxo-1-benzopyran-3-yl)-acetamide with a melting point of 198° C.

Provenance & Evidence