Method for preparing pyridine-2,3-dicarboxylic acid esters

Details Method for preparing pyridine-2,3-dicarboxylic acid esters Method for preparing pyridine-2,3-dicarboxylic acid esters

C - Chemistry, Metallurgy

07

D

C07D 213/80 (2006.01) C07D 213/61 (2006.01) C07D 213/803 (2006.01)

Patent

CA 2211048

A method is described for preparing pyridine- 2,3-dicarboxylic acid esters of the general formula: (See formula I) wherein R is C1-6-alkyl, C3-6-cycloalkyl, aryl or arylalkyl, and R1 to R3, independently of one another, each represent hydrogen, C1-6-alkyl, fluorinated C1-6-alkyl, C1-6-alkoxy, (C1-6-alkoxy)-C1-6-alkyl or (C1-6-alkoxy)carbonyl. These are obtained from the corresponding 2,3-dichloropyridine, the corresponding alcohol ROH and carbon monoxide in the presence of a palladium-diphosphine complex and a weak base. Pyridine- 2,3-dicarboxylic acid esters are herbicides or intermediates for the preparation of herbicides.

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