Cyanoacetic acid → 6-Amino-1-butyl-1,2,3,4-tetrahydropyrimidine-2,4-dione

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Reaction Conditions

Reaction Steps

To a solution of 46 g (0.55 mol) cyanoacetic acid and 100 ml of acetic anhydride was added 58 g (0.5 mol) of n-butylurea. The solution was stirred at 70° C. for 2 hours. After cooling white crystals were filtered off and washed with ethanol. Yield 68 g (74%) (VII). This was stirred in 500 ml of water and 20 ml of 5N NaOH was added in portions so the solution the whole time was basic. The reaction mixture was refluxed for 20 minutes and then neutralized with 5N HCl. After cooling, white crystals were filtered off. Yield 50.6 g (75%) (VIII), NMR.

Provenance & Evidence