Cl.[Cl:2][C:3]1(C(OC)=O)[CH:8](O)[NH:7][C:6](=[O:10])[NH:5][C:4]1=[O:11]>>[Cl:2][C:3]1[C:4](=[O:11])[NH:5][C:6](=[O:10])[NH:7][CH:8]=1In 15 ml. of concentrated hydrochloric acid, 345 mg. of methyl 5-chloro-6-hydroxy-1,2,3,4,5,6-hexahydro-2,4-dioxopyrimidine-5-carboxylate is heated under reflux for 15 hours. The reaction mixture is cooled with ice, whereupon 92 mg. of 5-chlorouracil is obtained as colorless prisms.
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