C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/280, 260/315
C07D 231/14 (2006.01) C07D 401/02 (2006.01) C07F 7/10 (2006.01)
Patent
CA 2034594
HOE 90/F 016 Abstract of the disclosure Process for the preparation of pyrazolecarboxylic acid derivatives Process for the preparation of pyrazolecarboxylic acid derivatives of the formula I Image (I) in which R1 independently of one another is haloalkyl or halo- gen, R2 is alkyl or alkynyl, R3 is an alkali metal or alkaline earth metal, hydrogen, alkyl or alkoxyalkyl and n = 1 or 2, by reaction of a compound of the formula II Image (II) in which Z is chlorine or bromine, with an enol ether of the formula III (III) Image in which R5 is alkyl, to give a compound of the formula IV Image (IV) and its subsequent aromatization to give the compound I, wherein the reaction of the compound II with the compound III to give the compound IV is carried out in a 2-phase system (aqueous/organic) in the presence of an inorganic base at temperatures of 40 - 100°C and at pH values of 7- 10 and then the compound IV formed is aromatized, without prior isolation, under acidic conditions in a 2-phase system (aqueous/organic) to give the compound of the formula I.
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
Lachhein Stephen
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