Sodium Hydroxide → 7-chloro-2,2-dimethyl-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one

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반응 단계

4.5 g of 7-hydroxy-2,2-dimethyl-2,3-dihydro-1H-imidazo[1,2-a]pyrimidin-5-one and 35 ml of phosphorus oxychloride are introduced into a round-bottomed flask. The resulting mixture is then heated at 120° C. for three hours. After cooling, the reaction mixture is concentrated to dryness under reduced pressure. Ice is added to the residue obtained, and then concentrated sodium hydroxide is added until a pH in the region of 5-6 is obtained. The solid formed is filtered off so as to give 1 g of 7-chloro-2,2-dimethyl-2,3-dihydro-1H-imidazo[1,2-a]pyrimidin-5-one, in the form of a brown solid, the characteristics of which are the following:

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