Phosphorus oxychloride → 3-benzyl-6-chloro-5-isopropylpyrimidine-2,4(1H,3H)-dione

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Reaction Steps

To 16.8 ml of 50% ethanol, 78.7 ml (844 mmol) of phosphorus oxychloride was added drop by drop, with stirring under ice cooling conditions. To this solution, 26.03 g (100 mmol) of 3-benzyl-5-isopropylpyrimidine-2,4,6(1H,3H)-trione was added little by little. This mixture was stirred at 50° C. for 30 minutes and then at 100° C. for 90 minutes. After cooling, the reaction mixture was poured into ice water and stirred for 1 hour. The resulting precipitate was collected by filtration, washed with water and n-hexane and dried to yield 27.05 g (97.0%, white crystal) of the desired product.

Provenance & Evidence