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

2006-03-07

2006-03-07

Morris, Patricia L. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C546S296000, C546S299000, C546S321000

Reexamination Certificate

active

07009058

ABSTRACT:
A method for preparing pyridine-2,3-dicarboxylic acid esters of the general formula:wherein R is C1-6-alkyl, C3-6-cycloalkyl, aryl or arylalkyl, and R1to R3, independently of one another, represent hydrogen, C1-6-alkyl, fluorinated C1-6-alkyl, C1-6-alkoxy, (C1-6-alkoxy)-C1-6-alkyl or (C1-6-alkoxy)carbonyl. These esters 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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