Water → 1-(2-Mercapto-4-methoxyphenyl)-5-carboxypyrimidine-2,6-dione

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Reaction Steps

25 g. Diethyl N-(6-methoxybenzthiazol-2-yl)-aminomethylenemalonate are introduced into a solution of 36 g. sodium hydroxide, 360 ml. water and 120 ml. ethanol which has been heated to 70° C. and the reaction mixture is heated under reflux for 30 minutes. A part of the ethanol is then removed in vacuo, filtered and, after cooling, the filtrate is acidified with 2 N hydrochloric acid. 1-(2-Mercapto-4-methoxyphenyl)-5-carboxypyrimidine-2,6-dione is obtained in a yield of 14.7 g. (70% of theory). According to the melting point and the IR, UV and NMR spectra, the product is identical with the compound prepared according to Variant I.

Provenance & Evidence