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

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Reaction Conditions

Reaction Steps

18.5 g of 7-hydroxy-2,2-dimethyl-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one are suspended in 200 mL of dichloroethane. 48 mL of POCl3 are added and the mixture is heated to 60° C. for 3 h. After returning to RT, the solvents are dry evaporated. The residue is taken up in water and AcOET, 30% NaOH is added until pH=12. The product precipitates, it is filtered and then dried. 16.9 g (yield=83%) of 7-chloro-2,2-dimethyl-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one are obtained as a yellow solid and including the following characteristics:

Provenance & Evidence