申请人:Sumitomo Chemical Company, Limited
公开号:US06156891A1
公开(公告)日:2000-12-05
Carboxylic acids of formula (1): ##STR1## wherein R.sup.2 and R.sup.3 are independently hydrogen or C.sub.1 -C.sub.3 alkyl, and Q is optionally substituted phenyl, can be easily converted by ring closing into pyridazin-3-one derivatives of formula (7): ##STR2## The carboxylic acids of formula (1) can be produced by reacting hydrazone compounds of formula (5): ##STR3## wherein R.sup.3 and Q are as defined above, with malonic acid derivatives of formula (6): R.sup.2 CH(COOH).sub.2 wherein R.sup.2 is as defined above in the presence of a base.
公式(1)的羧酸:其中R.sup.2和R.sup.3分别独立表示氢或C.sub.1-C.sub.3烷基,Q是可选择取代的苯基,可以通过环闭合轻松转化为公式(7)的吡啶并[3,2-b]吡嗪-3-酮衍生物:##STR2## 公式(1)的羧酸可以通过将公式(5)的腙化合物与公式(6)的丙二酸衍生物在碱存在下反应制备,其中R.sup.3和Q如上定义,R.sup.2 CH(COOH).sub.2中的R.sup.2如上定义。