Phosphorus oxychloride → 2-Chloro-3-methyl-6-pyridin-4-yl-5-m-tolyl-3H-pyrimidin-4-one

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Reaction Steps

A mixture of 3-methyl-5-(3-methylphenyl)-6-(4-pyridyl)-2,4(1 H,3 H)-pyrimidindione (12.5 g, 0.043 mol) and phosphorus oxychloride (65 ml) was refluxed for 16 h. The excess of phosphorus oxychloride was evaporated followed by co-distillation with toluene. The remainder was carefully partitioned between dichloromethane and aqueous sodium hydrogencarbonate. The organic solution was washed with water, dried and evaporated to leave the title compound. MS (m/z): 312 (M)+ ; C17H14ClN3O requir. 311.8.

Provenance & Evidence