Acetonitrile → Rosuvastatin Impurity 162

Participants

Reaction Conditions

Reaction Steps

In a 200 mL-volume glass flask were placed 27.6 g (95.1 mmol.) of 4-(4-fluorophenyl)-2-hydroxy-6-isopropyl-5-methoxycarbonylpyrimidine, 12.5 g (123 mmol.) of triethylamine, and 95 mL of acetonitrile. The mixture of the flask was chilled to 0-5° C. in an ice bath. To the chilled mixture was slowly added 20.0 g (105 mmol.) of p-toluenesulfonyl chloride, and the resulting mixture was subjected to reaction at 20-25° C. for one hour. After the reaction was complete, to the reaction mixture was added 95 mL of water. The aqueous reaction mixture was extracted with toluene and the toluene portion was separated. The toluene portion was washed with a saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The dried mixture was filtered and concentrated under reduced pressure. The residue was crystallized from methanol, to give 35.9 g of 4-(4-fluorophenyl)-6-isopropyl-5-methoxycarbonyl-2-(p-toluenesulfonyloxy)pyrimidine as a colorless crystalline product having the below-mentioned characteristics. The yield was 85% (based on the amount of 4-(4-fluorophenyl)-2-hydroxy-6-isopropyl-5-methoxycarbonylpyrimidine).

Provenance & Evidence