2-Amino-4,6-dimethoxypyrimidine → Methyl 3 [[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl] aminosulfonyl]-2-thiophenecarboxylate

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Reaction Steps

To 1.5 g of 2-amino-4,6-dimethoxypyrimidine in 30 ml of anhydrous acetonitrile was added 2.7 g of 2-methoxycarbonyl-3-thiophenesulfonyl isocyanate with stirring at ambient temperature. All of the solid reactant dissolved and after twenty minutes of stirring a precipitate started to form. After two hours the mixture was filtered and the solid which was washed with anhydrous ethyl ether, melted at 191°-193°. The solid showed peaks by nuclear magnetic resonance spectroscopy at 4.0 ppm and 3.8 ppm for the methoxy groups, 6.0 ppm for the H of pyrimidine and 7.6 ppm for the hydrogens on thiophene. The infrared absorption spectrum showed absorption peaks at 1730 and 1700 cm-1 consistent for the two carbonyl peaks in the desired product.

Provenance & Evidence