Trifluoroacetic acid → 5-(3-Methoxy-allylidene)-1,3-dimethyl-pyrimidine-2,4,6-trione

Participants

Reaction Conditions

Reaction Steps

1,3-Dimethylbarbituric acid (20 g, 0.1 mol; Aldrich) was placed in 100 mL round-bottom one-necked flask equipped with magnetic stir bar and reflux condenser, 1,1,3,3-tetramethoxy-propane, (40 mL, 0.2 mol; Aldrich) and 1 mL of Trifluoroacetic Acid (2 mL, 0.03 mol; Sigma) were added to the reaction mixture. The flask was heated at 100° C. with stirring for 5 hours and then cooled to room temperature. The crystallized product was filtered, washed with methanol and dried. The yield was 23 g (80% of theory).

Provenance & Evidence