Process for preparing pyridine-2,3-dicarboxylic acid compounds

Details Process for preparing pyridine-2,3-dicarboxylic acid compounds Process for preparing pyridine-2,3-dicarboxylic acid compounds

1992-02-03

1993-10-12

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546321, C07D21308, C07D21380

Patent

active

052527395

ABSTRACT:
A process for preparing pyridine-2,3-dicarboxylic acid compounds of the following formula, which comprises preparing .alpha.-halo-oxalacetic acid diesters by reacting oxalacetic acid diester alkali metallic salts with an acid and a halogenating agent or by reacting oxalic acid diesters with halo-acetic acid esters, and then reacting the obtained .alpha.-halo-oxalacetic acid diesters with 2-propenal compounds and ammonia. ##STR1## wherein R.sup.1 and R.sup.2 are, identical or different, a lower alkyl group, and R.sup.3 is a hydrogen atom or a lower alkyl group.
The pyridine-2,3-dicarboxylic acid compounds obtained by the process of the invention are useful as an intermediate for manufacturing agricultural chemicals and pharmaceuticals.

REFERENCES:
Chemical Abstracts, vol. 112 (No. 21), Abst. No. 198,071w May 21, 1990.
Chemical Abstracts, vol. 115 (No. 9) Abst. No. 92028J Sep. 2, 1991.

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