Process for preparing pyridine carboxylic acid derivatives

Details Process for preparing pyridine carboxylic acid derivatives Process for preparing pyridine carboxylic acid derivatives

C - Chemistry, Metallurgy

07

D

260/273, 260/277

C07D 213/79 (2006.01) C07D 213/80 (2006.01) C07D 215/54 (2006.01) C07D 221/04 (2006.01) C07D 401/06 (2006.01) C07D 471/04 (2006.01)

Patent

CA 2022408

ABSTRACT OF THE DISCLOSURE A method for preparing pyridine carboxylic acid esters by reacting N-hydroxyamino derivatives of the formula: Image II wherein R5 and R6 are each independently H, COZ, or CN, provided that they are not both H; or R5 and R6 together are -CO-NR10-CO; Z is OR8 or NR8R9; R8 and R9 are each independently H or alkyl or aryl; or R8 and R9 together with the nitrogen atom form an aliphatic or aromatic heterocyclic structures and R10 is hydrogen, alkyl, aryl, hydroxy or an alkoxy of 1-6 carbon atoms; with an .alpha.,.beta.-unsaturated aldehyde or ketone is disclosed. In an additional embodiment, an alkene of formula R5-CH=CH-R6, wherein R5 and R6 are defined as above, is reacted with hydroxylamine or a salt thereof to form N-hydroxylamino derivatives which are then treated as above.

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