Water → 5-Butyl barbituric acid

Participants

Reaction Conditions

Reaction Steps

A quantity of 3.85 g of 1-t.butyl-3-phenylurea is stirred at 0° C. in 50 ml of dry diethyl ether. 1.95 ml of malonylchloride are slowly added dropwise to this solution. After the addition of a little triethylamine the reaction mixture is slowly heated to approximately 30° C. After 2 hours 50 ml of water are added. The ether layer is separated, washed with water, dried and evaporated. After recrystallisation from ethanol, 1-phenyl-3-t.butyl-barbituric acid is obtained in a yield of 0.6 g; melting-point 118°-125° C. The resulting product is acetylated as described in Example III, the title compound (28) being obtained; melting-point 145°-148° C.

Provenance & Evidence