Brimonidine → 8-(5-Bromo-6-quinoxalinyl)-2,3,5,6,7,8-hexahydro-5-oxoimidazo[1,2-a]pyrimidine-7-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Brimonidine (7.0 g) and maleic anhydride (3.53 g) were added to ethanol free chloroform (200 ml) and heated to 50° C. overnight. The solvent was evaporated and the residue slurried in MeCN (50 ml) at 30° C. for 2 h. The resultant solid was filtered washed with MeCN (25 ml) and dried in an oven at 40° C. to yield 10.5 g of 8-(5-bromoquinoxalin-6-yl)-5-oxo-2,3,5,6,7,8-hexahydroimidazo[1,2-a]pyrimidine-7-carboxylic acid.

Provenance & Evidence