Conversion of 2-pyrazolines to pyrazoles using bromine

C - Chemistry – Metallurgy – 07 – D

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C07D 401/04 (2006.01) C07D 231/06 (2006.01) C07D 231/16 (2006.01)

Patent

CA 2601870

This invention relates to a method for preparing a compound of Formula 1 wherein L, R1, R2 and X are as defined in the disclosure, comprising contacting a 2 pyrazoline of Formula 2 with bromine at a temperature of at least about 80~C. (Formula 1) (Formula 2). This invention also discloses preparation of a compound of Formula 3 wherein X, Z, R5, R6, R7, R8a, R8b and n are as defined in the disclosure, using a compound of Formula 1a wherein R10 is as defined in the disclosure, prepared by the aforesaid method for preparing a compound of Formula 1. (Formula 3) (Formula 4).

La présente invention concerne un procédé de préparation d'un composé de formule 1, dans laquelle L, R1, R2 et X sont tels que définis dans la description. Ledit procédé consiste à mettre en contact une 2-pyrazoline de formule 2 avec du brome à une température d'au moins environ 80 °C. La présente invention concerne également la préparation d'un composé de formule 3, dans laquelle X, Z, R5, R6, R7, R8a, R8b et n sont tels que définis dans la description, à l'aide d'un composé de formule 1a, dans laquelle R10 est tel que défini dans la description, préparé selon le procédé susmentionné de préparation d'un composé de formule 1.

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