Sulfuric Acid → 6-Amino-2-(ethoxymethyl)-5-nitroso-4(3H)-pyrimidinone

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Reaction Steps

17.7 g (0.256 mole) of sodium nitrite are added to a solution of 39.5 g (0.233 mole) of 6-amino-2-(ethoxymethyl)-4(3H)-pyrimidinone in 336 ml (0.336 mole) of 1N sodium hydroxide. A solution of 17.9 ml (0.320 mole) of 96% sulphuric acid diluted in 179 ml of water is then added dropwise at between 0° and 5° C. The precipitate formed is isolated by filtration immediately after completion of the addition. The solid obtained is washed with cold water and then with ethyl ether. After drying, it is used in the next step without further purification. Yld: 46.2 g (quantitative), m.p. 163°-165° C. An analytical sample was obtained by recrystallization from methanol. M.p. 166°-167° C.

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