Process for the preparation of 2-(imidazolin-2-yl)-3-pyridine- a

Details Process for the preparation of 2-(imidazolin-2-yl)-3-pyridine- a Process for the preparation of 2-(imidazolin-2-yl)-3-pyridine- a

1987-02-05

1988-07-19

Hollrah, Glennon H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546278, C07D40102

Patent

active

047586672

ABSTRACT:
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.

REFERENCES:
patent: 4518780 (1985-05-01), Barton et al.
patent: 4562257 (1985-12-01), Petrocine
patent: 4638068 (1987-01-01), Los

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