Process for production of pyrazole compounds

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 231/20 (2006.01) C07D 401/12 (2006.01) C07D 413/12 (2006.01) C07D 413/14 (2006.01) C07D 417/12 (2006.01)

Patent

CA 2467115

A process by which pyrazole compounds useful as intermediates in the preparation of drugs such as diabetes remedies can be easily produced in high yield, specifically, a process for the production of compounds represented by the general formula (I) or salts thereof: (I) [wherein R1 is a hydrocarbon group which may be substituted; and n is an integer of 1 to 4], characterized by reacting a compound represented by the general formula (II) or a salt thereof with hydrazine or a salt thereof: (II) [wherein Q is optionally substituted hydroxyl or optionally substituted amino; R is a hydrocarbon group which may be substituted; and n and R1 are each as defined above].

L'invention concerne un procédé de production aisée et à haut rendement de composés pyrazole, qui sont utiles en tant que produits intermédiaires dans la préparation de médicaments tels que des médicaments contre le diabète, et plus particulièrement un procédé pour réaliser des composés de formule (I) ou des sels de ceux-ci : (I), dans laquelle R?1¿ signifie un groupe hydrocarbure pouvant être substitué et n est un nombre entier entre 1 et 4. L'invention est caractérisée en ce qu'un composé de formule (II) ou un sel de celui-ci est mis à réagir avec de l'hydrazine ou un sel de celle-ci : (II), où Q est hydroxyle éventuellement substitué ou amino éventuellement substitué, R désigne un groupe hydrocarbure pouvant être substitué et n et R?1¿ sont tels que susmentionnés.

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