Hydrochloric Acid → 4-(3-methyl-4-nitrophenyl)-6-[2-(propyloxy)phenyl]pyrimidin-2(1H)-one

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To a solution of (1Z)-3-imino-3-(3-methyl-4-nitrophenyl)-1-[2-(propyloxy)phenyl]prop-1-en-1-amine (2.20 g, 6.45 mmol) in ethanol (100 mL) was added urea (6.0 g, 100 mmol) and hydrochloric acid in dioxane 4.0 N (25 mL) at room temperature. The reaction mixture was heated to 75° C. for 16 h, at which time it was concentrated in vacuo, diluted with water (200 mL) and adjusted to pH 10 with sodium hydroxide 2.0 N. The product was extracted with chloroform (200 mL) then diluted with hexanes (50 mL) to precipitate the product. The solid was filtered and washed with chloroform/hexanes (1:4) to give 4-(3-methyl-4-nitrophenyl)-6-[2-(propyloxy)phenyl]pyrimidin-2(1H)-one (1.80 g, 81%). MS (EI) for C20H19N4O3: 363 (MH+).

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