申请人:Ciba-Geigy Corporation
公开号:US04997947A1
公开(公告)日:1991-03-05
The invention relates to processes for the preparation of 6-substituted 2-(imidazolin-2-yl)-nicotinic acid derivatives that are distinguished by excellent herbicidal and plant growth-regulating properties, and to intermediates and processes for the preparation of the intermediates. The derivatives correspond to formula I ##STR1## in which R.sub.1 represents hydrogen or a salt, ester or amide radical, each of R.sub.2 and R.sub.3, independently of the other, represents C.sub.1 -C.sub.4 -alkyl or they together represent a C.sub.3 -C.sub.5 -alkylene radical, X represents hydrogen or methyl, Y represents hydrogen, halogen, alkyl, haloalkyl, hydroxyalkyl, alkoxy, alkylthio, phenoxy, nitro, cyano, alkylamino, phenyl, alkenyloxy or alkynyloxy, and Z represents a --CQ.sub.1 Q.sub.2 Q.sub.3 or --CQ.sub.1 Q.sub.4 Q.sub.5 radical in which Q.sub.1 and Q.sub.2 each represents hydrogen or C.sub.1 -C.sub.4 -alkyl, Q.sub.3 represents C.sub.1 -C.sub.6 -alkoxy or phenoxy that is unsubstituted or substituted, or C.sub.3 -C.sub.6 -alkenyloxy or C.sub.3 -C.sub.6 -alkynyloxy and Q.sub.4 and Q.sub.5, together with the carbon atom to which they are bonded, represent a cycloalkyl, furyl, pyran, dioxan or dioxolan radical, or Z represents a 5- or 6-membered heterocyclic radical.
该发明涉及制备6-取代的2-(咪唑啉-2-基)-烟酸衍生物的过程,这些衍生物具有优秀的除草和植物生长调节特性,以及制备中间体和制备中间体的过程。这些衍生物对应于以下式I ##STR1## 其中R.sub.1代表氢或盐、酯或酰胺基团,R.sub.2和R.sub.3中的每一个独立地代表C.sub.1-C.sub.4-烷基或它们共同代表一个C.sub.3-C.sub.5-烷基烯基基团,X代表氢或甲基,Y代表氢、卤素、烷基、卤代烷基、羟基烷基、烷氧基、硫代烷基、苯氧基、硝基、氰基、烷基氨基、苯基、烯氧基或炔氧基,Z代表--CQ.sub.1 Q.sub.2 Q.sub.3或--CQ.sub.1 Q.sub.4 Q.sub.5基团,其中Q.sub.1和Q.sub.2各自代表氢或C.sub.1-C.sub.4-烷基,Q.sub.3代表未取代或取代的C.sub.1-C.sub.6-烷氧基或苯氧基,或C.sub.3-C.sub.6-烯氧基或C.sub.3-C.sub.6-炔氧基,Q.sub.4和Q.sub.5与它们结合的碳原子一起代表环烷基、呋喃基、吡喃基、二氧杂环丁烷基或二氧杂环丁烯基,或Z代表5-或6-成员杂环基团。