Process for the preparation of pyridine-2, 3-dicarboxylic acids

Details Process for the preparation of pyridine-2, 3-dicarboxylic acids Process for the preparation of pyridine-2, 3-dicarboxylic acids

C - Chemistry, Metallurgy

12

N

195/114, 195/1.3

C12N 1/00 (2006.01) C07D 213/80 (2006.01) C12N 9/02 (2006.01) C12P 7/44 (2006.01) C12P 17/12 (2006.01)

Patent

CA 2012680

1129-103 ABSTRACT OF THE DISCLOSURE Pyridine-2,3-dicarboxylic acids are prepared by the action of 2,3 dihydroxybenzoate-3,4-dioxygenase on 2,3-dihydroxybenzoic acids in a liquid medium which lacks active decarboxylase and which has a pH from 4 to 9, an ionic strength below about 1 molar, and a low concentration of metal cations and complex anions. In close temporal proximity, the 2-hydroxy-3-carboxy- muconic acid semialdehyde which forms is allowed to react with a source of ammonia or a primary amine, avoiding substantial decarboxylation.

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