Water → 2,6-Dioxo-5-[3-(3-trifluoromethyl-phenyl)-ureido]-1,2,3,6-tetrahydro-pyrimidine-4-carboxylic acid

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Reaction Steps

5-Amino-orotic acid (0.86 g) was dissolved in DMSO (10 ml), treated with 3-trifluoromethylphenylisocyanate (0.9 ml) and after an hour with another 0.5 ml. The reaction was stirred for three days at room temperature. Water was added and the mixture was filtered and washed with water. The residue was slurried in water, treated with NaOH and worked through until basic. Filtration and acidification of the filtrate provided a precipitate, which was filtered, washed with water and dried. Recrystallisation from 96% EtOH provided 2,6-dioxo-5-[3-(3-trifluoromethyl-phenyl)-ureido]-1,2,3,6-tetrahydro-pyrimidine-4-carboxylic acid (330 mg). Mp. >300° C.

Provenance & Evidence