申请人:UBE INDUSTRIES, LTD.
公开号:EP0326389A2
公开(公告)日:1989-08-02
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.
一种制备式 III 的 4-羟基嘧啶的工艺:
其中 R₁ 和 R₂ 各自代表氢原子、具有 1 至 10 个碳原子的烷基、具有 3 至 10 个碳原子的环烷基或具有 1 至 10 个碳原子的芳基,而 R₄ 代表具有 7 至 10 个碳原子的烷基、具有 3 至 10 个碳原子的环烷基、具有 7 至 10 个碳原子的芳基或具有 6 至 10 个碳原子的芳基、
其中包括将式 1 的 3-氨基-2-不饱和羧酸酯
其中 R₁ 和 R₂ 如上文所定义,R₃ 代表具有 1 至 10 个碳原子的烷基、具有 3 至 10 个碳原子的环烷基或具有 7 至 10 个碳原子的芳基、
和式 II 的羧酸酰胺:
R ₄ C O N H ₂
其中 R₄ 如上定义、
在碱存在下相互反应。