申请人:Ciba-Geigy Corporation
公开号:US04803268A1
公开(公告)日:1989-02-07
The present invention relates to a novel, optimized process for the preparation of cyclohexanedionecarboxylic acid derivatives of formula I which can be carried out in a single vessel affording a very good yield, which process comprises heating a reactive carboxylic acid derivative of formula III ##STR1## wherein X is a halide, an alkylsulfonic or arylsulfonic acid radical or the molecular radical ##STR2## which is necessary to form an anhydride and R.sub.1 is alkyl or cycloalkyl, with an alkali metal cyanide or copper cyanide, in an inert organic solvent, to give a mixture, then adding in succession to said mixture, at a temperature in the range from 0.degree. C. to room temperature, zinc chloride, an equimolar amount, with respect to the carboxylic acid derivative of formula III, of a 3,5-cyclohexanedione-1-carboxylic acid derivative of formula II ##STR3## wherein A is an ester or amide radical, and, dropwise, an amine, and, after acidifying the reaction mixture with an aqueous acid, isolating the resultant 4-acyl-3,5-cyclohexanedione-1-carboxylic acid derivative of formula I ##STR4## by extraction. Said cyclohexanedionecarboxylic acid derivatives have herbicidal and plant growth regulating properties.
本发明涉及一种新的、优化的制备环己二酮二
羧酸衍
生物的方法,该方法可以在单个反应容器中进行,得到很高的收率。该方法包括将式III的反应性
羧酸衍
生物加热,其中X为卤素、烷基
磺酸或芳基
磺酸基团或分子基团,其必要性在于形成酸酐,R1为烷基或环烷基,与碱
金属
氰化物或
铜氰化物在惰性有机溶剂中反应,得到混合物,然后依次加入在0℃到室温范围内的温度下,与式III的
羧酸衍
生物相当的摩尔量的式II的3,5-环己二酮-1-
羧酸衍
生物,其中A为酯或酰胺基团,以及滴加胺,然后用
水酸酸化反应混合物,通过萃取分离所得的4-酰基-3,5-环己二酮-1-
羧酸衍
生物,即式I。所述的环己二酮二
羧酸衍
生物具有除草和植物生长调节作用。