申请人:Ciba-Geigy Corporation
公开号:US04758667A1
公开(公告)日:1988-07-19
There is disclosed a process for the preparation of 2-(imidazolin-2-yl)-3-pyridine and -3-quinolinecarboxylic acids of formula ##STR1## wherein R.sub.1 is hydrogen or C.sub.1 -C.sub.4 alkyl, R.sub.2 is hydrogen, halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 hydroxyalkyl, C.sub.1 -C.sub.4 alkoxy, phenyl or phenyl-C.sub.1 -C.sub.4 alkyl, or phenyl or phenyl-C.sub.1 -C.sub.4 -alkyl, each substituted by one C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen, R.sub.3 is hydrogen, C.sub.1 -C.sub.4 alkyl, phenyl, phenyl-C.sub.1 -C.sub.4 -alkyl, or phenyl or phenyl-C.sub.1 -C.sub.4 -alkyl, each substituted by one C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen, R.sub.2 and R.sub.3 together are 1,3-butadienylene which can be substituted by halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 alkylsulfonyl, nitro, cyano, phenyl, phenoxy, or phenyl or phenoxy, each substituted by one C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen, and R.sub.4 and R.sub.5 are each independently of the other C.sub.1 -C.sub.4 alkyl. In this process, the 2-(imidazolin-2-yl)-3-pyridine- and -3-quinolinecarboxylic acids of the above formula are obtained by reacting a 2,3-pyridine- or 2,3-quinolinedidicarboxylic acid ester of formula ##STR2## wherein R.sub.1, and R.sub.2 and R.sub.3 are as defined above and R.sub.6 is C.sub.1 -C.sub.8 alkyl, phenyl or C.sub.1 -C.sub.4 phenylalkyl with a 2-aminoalkanecarboxamide of formula ##STR3## wherein R.sub.4 and R.sub.5 are as defined above, in an inert solvent and in the presence of a strong base, direct to a salt of a 2-(imidazolin-2-yl)-3-pyridine- or -3-quinolinecarboxylic acid of the above formula, from which the free 2-(imidazolin-2-yl)-3-pyridine- or -3-quinolinecarboxylic acids of the above formula are obtained by converting said salt into an aqueous solution and adding an acid. The 2-(imidazolin-2-yl)-3-pyridine- and -3-quinolinecarboxylic acids of the above formula have herbicidal properties and can be used for controlling undesired plant growth.
本公开了一种制备式的2-(咪唑啉-2-基)-3-吡啶和-3-喹啉羧酸的方法,其化学式为##STR1##其中R.sub.1为氢或C.sub.1-C.sub.4烷基,R.sub.2为氢、卤素、C.sub.1-C.sub.4烷基、C.sub.1-C.sub.4羟基烷基、C.sub.1-C.sub.4烷氧基、苯基或苯基-C.sub.1-C.sub.4烷基,或者苯基或苯基-C.sub.1-C.sub.4-烷基,每个基上取代一个C.sub.1-C.sub.4烷基、C.sub.1-C.sub.4烷氧基或卤素,R.sub.3为氢、C.sub.1-C.sub.4烷基、苯基、苯基-C.sub.1-C.sub.4-烷基,或者苯基或苯基-C.sub.1-C.sub.4-烷基,每个基上取代一个C.sub.1-C.sub.4烷基、C.sub.1-C.sub.4烷氧基或卤素,R.sub.2和R.sub.3一起为1,3-丁二烯基,可以被卤素、C.sub.1-C.sub.4烷基、C.sub.1-C.sub.4烷氧基、C.sub.1-C.sub.4卤代烷基、C.sub.1-C.sub.4烷基磺酰基、硝基、氰基、苯基、苯氧基或苯基或苯氧基取代,每个基上取代一个C.sub.1-C.sub.4烷基、C.sub.1-C.sub.4烷氧基或卤素,R.sub.4和R.sub.5各自独立地为C.sub.1-C.sub.4烷基。在这个方法中,通过将上述化学式的2-(咪唑啉-2-基)-3-吡啶和-3-喹啉羧酸与式的2,3-吡啶-或2,3-喹啉二羧酸酯反应得到,其中R.sub.1、R.sub.2和R.sub.3如上定义,R.sub.6为C.sub.1-C.sub.8烷基、苯基或C.sub.1-C.sub.4苯基烷基,与式的2-氨基烷基羧酰胺在惰性溶剂中,在强碱存在下反应,直接得到上述化学式的2-(咪唑啉-2-基)-3-吡啶或-3-喹啉羧酸的盐,通过将该盐转化为水溶液并加入酸,得到上述化学式的自由2-(咪唑啉-2-基)-3-吡啶或-3-喹啉羧酸。上述化学式的2-(咪唑啉-2-基)-3-吡啶和-3-喹啉羧酸具有除草性能,可用于控制不受欢迎的植物生长。