Method for preparing 3-halo-4,5-dihydro-1h-pyrazoles

C - Chemistry – Metallurgy – 07 – D

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C07D 401/04 (2006.01)

Patent

CA 2494047

This invention relates to a method for preparing 3-halo-4,5-dihydro-1<I>H</I>- pyrazole compound of Formula (I), comprising contacting with HX1 a different 4,5-dihydro-1<I>H</I>-pyrazole compound of Formula (II), wherein X1 is halogen and L, R, k and X2 are as defined in the disclosure. This invention also discloses preparation of compounds of Formula (III) wherein X1, R3, R6, R7, R8a, R8b, and n are as defined in the disclosure.

La présente invention concerne un procédé d'élaboration de composé 3-halo-4,5-dihydro-1<I>H</I>-pyrazole représenté par la formule (I). Pour ce procédé, on met en contact le HX?1¿ avec un composé 4,5-dihydro-1<I>H</I>-pyrazole différent représenté par la formule (II). Dans cette formule, X?1¿ est halogène, L, R, k et X?2¿ étant tels que définis dans l'exposé. L'invention concerne également l'élaboration de composés représentés par la formule (III) dans laquelle X?1¿, R?3¿, R?6¿, R?7¿, R?8a¿, R?8b¿ et n sont tels que définis dans l'exposé.

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