Tetrafluorophthalic anhydride → 5-Ethyl-1-phenyl-5-(tetrafluorophthalimido)barbituric acid

Participants

Reaction Steps

A mixture of about 250 mg (about 1 mmol) of 5-amino-5-ethyl-1-phenylbarbituric acid, about 260 mg (about 1.2 mmol) of tetrafluorophthalic anhydride, and about 7 mL of acetic acid was refluxed for about 3 hours. The solvent was evaporated to dryness under reduced pressure of from about 200 to about 15 mbar. The residue was recrystallized from ethyl alcohol to yield about 270 mg 5-ethyl-1-phenyl-5-(tetrafluorophthalimido)barbituric acid (a 60% yield) having a melting point of about 218° to about 220° C.

Provenance & Evidence