Nitric Acid → 6-Chloro-1,3-dimethyl-5-nitropyrimidine-2,4(1h,3h)-dione

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Reaction Steps

To 25 ml of surfuric acid was gradually added 8.5 g (0.049 mol) of 6-chloro-1,3-dimethyluracil as described in Synthesis Example 1. To the solution was gradually added at 0° to 5° C. 8.5 ml of fuming nitric acid and the mixture was stirred for 5 minutes. The reaction solution was poured onto ice and extracted twice with chloroform. The organic layer was dried with anhydrous magnesium sulfate, concentrated and the crystals thus-obtained were recrystallized from a solvent mixture of ethyl acetate and hexane to obtain 7.5 g of 6-chloro-1,3-dimethyl-5-nitrouracil.

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