Tetrafluorophthalic anhydride → 1-Ethyl-5-methyl-5-(4,5,6,7-tetrafluoro-1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-2,4,6(1H,3H,5H)-pyrimidinetrione

Beteiligte Stoffe

Reaktionsschritte

A mixture of 5-amino-1-ethyl-5-methylbarbituric acid (0.28 g, 1.50 mmol) and tetrafluorophthalic anhydride (0.40 g, 1.80 mmol) in glacial AcOH (111 mL) was stirred under reflux for 3 hours. The yellow solution was then allowed to cool down to room temperature and evaporated to dryness under reduced pressure. The oily residue was recrystallized from EtOH to give 1-ethyl-5-methyl-5-(tetrafluorophthalimido)barbituric acid (19f) as white crystals.

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