Carboxylic acids of formula (1):
wherein R2 and R3 are independently hydrogen or C1-C3 alkyl, and Q is optionally substituted phenyl, can be easily converted by ring closing into pyridazin-3-one derivatives of formula (7):
The carboxylic acids of formula (1) can be produced by reacting hydrazone compounds of formula (5):
wherein R3 and Q are as defined above, with malonic acid derivatives of formula (6):
R2CH(COOH)2
wherein R2 is as defined above, in the presence of a base.
公式(1)的
羧酸:其中R2和R3独立地为氢或C1-C3烷基,Q是可选取代的苯基,可以通过环闭合轻松转化为公式(7)的
吡嗪-3-酮衍
生物:公式(1)的
羧酸可以通过以下反应生成:公式(5)的腙化合物与公式(6)的
丙二酸衍
生物反应,在碱的存在下,其中R3和Q如上所定义,R2如上所定义。