A process for preparing a 4-hydroxypyrimidine of Formula III:
wherein R₁ and R₂ each represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms or an aralkyl group having 1 to 10 carbon atoms, and R₄ represents an alkyl group having 7 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms,
which comprises subjecting a 3-amino-2-unsaturated carboxylate of Formula 1:
wherein R₁ and R₂ are as defined above and R₃ represents an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms or an aralkyl group having 7 to 10 carbon atoms,
and a carboxylic acid amide of Formula II:
R ₄ C O N H ₂
wherein R₄ is as defined above,
to reaction with each other in the presence of a base.
β-enaminones is presented: in the presence of tetraethyl orthosilicate, a number of highly functional β-enamino esters were obtained; this method provided an alternative for the formation of β-amino-α,β-unsaturated carbonyl compounds with mild and functional group compatible reaction conditions.