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

C - Chemistry, Metallurgy

07

D

260/281, 260/295

C07D 213/80 (2006.01) C07D 215/54 (2006.01) C07D 221/04 (2006.01)

Patent

CA 1334417

An improved process for preparing pyridine-2,3- dicarboxylic acid compounds of the formula: Image (I) wherein R1 and R3 are each H, substituted or unsubstituted alkyl, or substituted or unsubstituted phenyl; R2 is H, substituted or unsubstituted alkyl, substituted or unsubstituted phenyl, alkylthio, alkoxy, substituted or unsubstituted phenylthio, substituted or unsubstituted phenoxy, halogen, alkoxycarbonyl, amino- carbonyl which may optionally be substituted, or cyano; or both of R1 and R2 or both R2 and R3 may be combined together to form a divalent alkylene; and R4 and R5 are each alkyl, which comprises reacting an enone (II) and an aminodiester (III) of the formulae: Image R4OOCCH=C(NH2)COOR5 (II) (III) The compounds of formula (I) are useful as intermediates in the preparation of herbicidally effective compounds.

571216

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