A practical protocol for the preparation of quinoxaline-2,3(1H,4H)-diones through direct C (sp 2 )À H hydroxylation of quinoxalin-2(1H)-ones in recyclable DL-α-Tocopherol methoxypolyethylene glycol succinate solution (2 wt% in water) (TPGS-750-M/H 2 O) was developed. The target products were exclusively generated and could be collected through extraction and recrystallization.