申请人:UBE Industries, Ltd.
公开号:US04935516A1
公开(公告)日:1990-06-19
A process for preparing a 4-hydroxypyrimidine of Formula III: ##STR1## wherein R.sub.1 and R.sub.2 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 2 to 10 carbon atoms, and R.sub.4 represents hydrogen an alkyl group having 1 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 I: ##STR2## wherein R.sub.1 and R.sub.2 are as defined above and R.sub.3 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.sub.4 CONH.sub.2 wherein R.sub.4 is as defined above, to reaction with each other in the presence of a base.
一种制备化合物III的4-羟基嘧啶的方法:其中R₁和R₂分别表示氢原子,具有1至10个碳原子的烷基基团,具有3至10个碳原子的环烷基基团或具有2至10个碳原子的芳基基团,R₄表示氢原子,具有1至10个碳原子的烷基基团,具有3至10个碳原子的环烷基基团,具有7至10个碳原子的芳基基团或具有6至10个碳原子的芳基基团,包括将化合物I的3-氨基-2-不饱和羧酸酯:其中R₁和R₂如上定义,R₃表示具有1至10个碳原子的烷基基团,具有3至10个碳原子的环烷基基团或具有7至10个碳原子的芳基基团,以及化合物II的羧酰胺:R₄CONH₂其中R₄如上定义,在碱存在下使它们相互反应的方法。