Phosphorus oxychloride → Ethyl 4-chloro-2-(dimethylamino)pyrimidine-5-carboxylate

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Reaction Steps

A suspension of 16 g of 2-dimethylamino-4-hydroxy-5-carboethoxy-pyrimidine in 100 ml of phosphorus oxychloride is heated to the boil for half an hour whilst stirring and is then filtered hot, and the filtrate is evaporated under reduced pressure. 200 g of ice are added to the oily residue. 200 ml of methylene chloride are added and 30% strength sodium hydroxide solution is then added, whilst cooling with ice, until the pH reaches 8. Inorganic salts which have precipitated are then filtered off and rinsed with methylene chloride. The organic phase is washed with water, dried over sodium sulphate and evaporated. 2-Dimethylamino-4-chloro-5-carboethoxypyrimidine is obtained as a yellowish oil which can be used further without purification.

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