Potassium Carbonate → 2-(2-dimethylaminobenzyl)thio-4(3H)-pyrimidinone

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Reaction Steps

The solution of 0.38 g (3.0 mmol) of 2-thiouracil [Am. Chem. J. 40, 550 (1908)] in 6 ml of aqueous 1N sodium hydroxide solution is added to the solution of 0.62 g (3.0 mmol) of (2-chloromethylphenyl)dimethylammonium chloride in 6 ml of chloroform at room temperature under vigorous stirring within about 30 minutes. After termination of the addition the pH value of the aqueous solution is controlled and, when necessary, it is adjusted to 9 by adding 20% potassium carbonate solution. Thereafter, the reaction mixture is stirred for 2 hours, the phases are separated, the aqoeous layer is extracted twice with 5 ml of chloroform each, the combined organic phase is washed with 5 ml of 1N sodium hydroxide solution and then twice with 5 ml of water each, dried over anhydrous sodium sulfate and evaporated under reduced pressure. The residue is thoroughly triturated with petroleum ether, filtered and recrystallized from ethanol to give 0.66 g (84%) of the title compound as a white crystalline product, m.p.: 156°-158° C.

Provenance & Evidence