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

1988-07-06

1990-08-14

Ford, John M.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546321, C07D21178, C07D21308

Patent

active

049488961

ABSTRACT:
Improved process for preparing pyridine-2,3-dicarboxylic acid compounds of the formula: ##STR1## wherein R.sup.1 and R.sup.3 are each H, (un)substituted alkyl, or (un)substituted phenyl; R.sup.2 is H, (un)substituted alkyl, (un)substituted phenyl, alkylthio, alkoxy, (un)substituted phenylthio, (un)substituted phenoxy, halogen, alkoxycarbonyl, aminocarbonyl which may optionally be substituted, or cyano; or both of R.sup.1 and R.sup.2 or both R.sup.2 and R.sup.3 may combined together to form a divalent alkylene; and R.sup.4 and R.sup.5 are each alkyl which are useful as an intermediate for preparing herbicidally effective compounds, which comprises reacting an enone (II) and an aminodiester (III) of the formulae: ##STR2##

REFERENCES:
patent: 4439607 (1984-03-01), Drabb
patent: 4460776 (1984-07-01), Wepplo
patent: 4723011 (1988-02-01), Doehner, Jr.
Adrian Waldner, et al., "Pyridine-2,3-Dicarboxylic Acid Derivatives and New 1-Amino-1,4-Dihydropyridine-2,3-Dicarboxylic Acid Derivatives", Chemical Abstracts, 104: 207246w.
Johnson, Jerry Lee, "Quinolinic Acid Esters", Chemical Abstracts, 105: 208767z.
Stacey, Gilbert J., et al., "Pyridine Derivatives Inducing Tillering and Agricultural Compositions Containing Them", Chemical Abstracts, 98: 198023e.
Esmans, E. L., et al. "The Synthesis of 3-Acetyl-5-Alkylpyridines", Bull. Soc. Chim. Belg., vol. 82, no. 5-6, 1973, pp. 435-439.
March, J. Advanced Organic Chemistry, 3rd ed. (1985).

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