Method for producing 1-substituted 5-hydroxypyrazoles

Details Method for producing 1-substituted 5-hydroxypyrazoles Method for producing 1-substituted 5-hydroxypyrazoles

C - Chemistry, Metallurgy

07

D

C07D 231/18 (2006.01) C07C 241/04 (2006.01) C07C 243/30 (2006.01) C07D 231/20 (2006.01)

Patent

CA 2349244

The invention relates to a method for producing substituted hydroxypyrazoles and new intermediate products. It relates in particular to a method for producing compounds of formula (I) in which R1 is hydrogen, an aliphatic group with between 1 and 8 carbon atoms, C1-C6-alkoxycarbonyl, C1-C6-alkyl thiocarbonyl or a cyclic ring system with between 3 and 14 ring atoms; R2 is hydrogen, an aliphatic group with between 1 and 8 carbon atoms; or R1 and R2 together with the carbon atom to which they are bound are a cyclic or bicyclic ring system with between 3 and 14 ring atoms. Said method comprises the production, as starting or intermediate products, of compounds of formula (II) in which R3 and R4 are readily cleavable groups and R1 and R2 have the meanings given above. Said compounds are cyclized under suitable reaction conditions to yield compounds of formula (I).

L'invention concerne un procédé de fabrication d'hydroxypyrazoles substitués, ainsi que de nouveaux produits intermédiaires. Elle a plus particulièrement pour objet un procédé de fabrication de composés de formule (I), dans laquelle R?1¿ désigne un hydrogène, un groupe aliphatique de 1 à 8 atomes de carbone, un alcoxycarbonyle en C¿1?-C¿6?, un alkylthiocarbonyle en C¿1?-C¿6?, un système cyclique de 3 à 14 atomes sur le noyau, et R?2¿ désigne un hydrogène, un groupe aliphatique de 1 à 8 atomes de carbone, ou bien R?1¿ et R?2¿ désignent, conjointement avec l'atome de carbone auquel ils sont liés, un système cyclique ou bicyclique de 3 à 14 atomes sur le noyau, comprenant, comme produits de départ ou comme produits intermédiaires, la fabrication de composés de formule (II), dans laquelle R?3¿ et R?4¿ désignent des groupes facilement séparables, et R?1¿ et R?2¿ ont les désignations précitées, lesdits composés étant cyclisés en composés de formule (I) dans des conditions réactionnelles appropriées.

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