Ammonia → 1-(4-Aminophenyl)pyrimidine-2,4(1H,3H)-dione

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To a solution of 1.4 g 1-(4-Nitro-phenyl)-1H-pyrimidine-2,4-dione in 120 mL MeOH, 15 g Raney Nickel (washed three times with MeOH) were introduced under a nitrogen atmosphere. Then 15 mL of a 7 M solution of NH3 in MeOH were added. The nitrogen atmosphere was replaced by a hydrogen atmosphere and the mixture was hydrogenated under normal pressure at RT. After 2 h the reaction mixture was filtered through a pad of celite. The solvents were removed under reduced pressure and the residue was subjected to the next reaction step without further purification. Yield: 502 mg.

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