Preparation of .alpha.-methoxyiminocarboxylic acid...

Details Preparation of .alpha.-methoxyiminocarboxylic acid... Preparation of .alpha.-methoxyiminocarboxylic acid...

C - Chemistry, Metallurgy

07

C

C07C 251/48 (2006.01) C07C 67/22 (2006.01) C07C 69/738 (2006.01) C07C 235/78 (2006.01) C07C 249/08 (2006.01) C07C 249/12 (2006.01) C07C 251/58 (2006.01) C07C 251/60 (2006.01) C07C 253/30 (2006.01) C07C 255/64 (2006.01) C07C 315/04 (2006.01) C07C 317/28 (2006.01) C07C 319/20 (2006.01) C07D 209/48 (2006.01) C07D 231/22 (2006.01) C07D 249/12 (2006.01) C07D 277/34 (2006.01)

Patent

CA 2192594

The invention concerns a method of preparing .alpha.-methoxyiminocarboxylic acid methylamides of formula (I)(X = nitro, trifluoromethyl, halogen, alkyl or alkoxy; n = 0, 1, 2, 3 or 4; Y = an organic carbon group) by the Pinner reaction of cyanoketone of formula (II) with an alcohol, followed by reaction of the ester of formula (IV) formed in the Pinner reaction with hydroxylamine to give an oxime of formula (V), methylation of (V) to give an oxime ether of formula (VI) and subsequent reaction of (VI) with methylamine. The invention also concerns the intermediates used in the method.

L'invention concerne un procédé de préparation de méthylamides d'acide .alpha.-méthoxyiminocarboxylique de la formule (I) (X = nitro, trifluorométhyle, halogène, alkyle ou alcoxy; n = 0, 1, 2,3 ou 4; Y = un reste carbone organique, par réaction de Pinner d'une cyanocétone de la formule (II) avec un alcool, et par réaction subséquente de l'ester de la formule (IV) résultant de la réaction de Pinner avec de l'hydroxylamine pour former l'oxime de la formule (V), par méthylation de (V) pour former l'éther d'oxime de la formule (VI) et réaction subséquente de (VI) avec de la méthylamine. L'invention concerne également les intermédiaires utilisés dans la mise en oeuvre dudit procédé.

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