申请人:Mitsubishi Kasei Corporation
公开号:US04904787A1
公开(公告)日:1990-02-27
A method for producing a 2,4-dihydroxyquinoline derivative of the formula: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is a hydrogen atom, a lower alkyl group, a lower alkoxy group or a halogen atom, and its tautomer, which comprises cyclizing an aryl malonic acid amide ester derivative of the formula: ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined above, and R.sup.5 is a lower alkyl group, by means of polyphosphoric acid.
一种生产2,4-二羟基喹啉衍生物的方法,其化学式为:##STR1## 其中R.sup.1、R.sup.2、R.sup.3和R.sup.4中的每一个均为氢原子、较低的烷基、较低的烷氧基或卤素原子,以及其互变异构体,包括通过聚磷酸的环化反应制备化合物的芳基丙二酸酰胺酯衍生物,其化学式为:##STR2## 其中R.sup.1、R.sup.2、R.sup.3和R.sup.4如上所定义,R.sup.5为较低的烷基。