Synthesis of Some 5-[2-Aryl-2-oxoethyl]-1,3-dimethylpyrimidine-2,4,6-trione Derivatives by a One-pot, Three-component Reaction

Abstract

This study reports the reduction of á,a-unsaturated ketones 4a-g, formed by condensation of arylglyoxals 2a-g with 1,3-dimethylbarbituric acid (3) by L-cysteine (5) in the presence of phosphotungstic acid as a catalyst. This reaction leads to the formation of 5-[2-aryl-2-oxoethyl]-1,3-dimethylpyrimidine-2,4,6-triones 6a-g, with no sign of any heterocyclic product formation. The structure of compound 6f was confirmed by X-ray crystallography.