Novel intramolecular rearrangement of 5-carbamoyluraclls into barbituric acids

Abstract Heating of 5-carbamoyl- ( 1 ) and 5-thiocarbamoyl-3-methyl-1-phenyluracil ( 5 ) derivatives in ethanolic sodium ethoxide causes a novel intramolecular rearrangement to give 5-anilinomethylenebarbituric acids( 2 ) and 5-anilinomethylene-4-thiobarbituric and( 6 ), respectively.