反应详情

温度

45 °C

A mixture of 0.5 g of 2(1H), 3(4H)-quinoxalinedione, 1.60 g of pentafluoroethylphenyliodonium trifluoromethanesulfonate and 10 ml of dimethylformamide was stirred overnight on an oil bath at 45° C. Ethyl acetate was then added to the reaction mixture and the unreacted 2(1H), 3(4H)-quinoxalinedione was removed by filtration (recovery of the starting material: 0.13 g). Water was added to the filtrate and, after rendering the mixture neutral, the mixture was extracted with ethyl acetate. The extract was washed with water, dried over magnesium sulfate, and the solvent was distilled off. A small amount of methylene chloride was added to the residue and the precipitated crystals were collected by filtration to obtain 0.05 g of 6-pentafluoroethyl-2(1H), 3(4H)-quinoxalinedione as colorless crystals. Yield 6% (conversion yield, 8%). Melting Point (after recrystallized from acetonitrile): 317°-320° C. (with decomposition).

1. customthe unreacted 2(1H), 3(4H)-quinoxalinedione was removed by filtration (recovery of the starting material
2. additionWater was added to the filtrate
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with water
5. dry with materialdried over magnesium sulfate
6. distillationthe solvent was distilled off
7. additionA small amount of methylene chloride was added to the residue
8. filtrationthe precipitated crystals were collected by filtration