Method for producing sulfonamides

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 303/38 (2006.01) C07C 201/12 (2006.01) C07C 205/58 (2006.01) C07C 303/40 (2006.01) C07C 311/51 (2006.01)

Patent

CA 2631113

The invention relates to methods for producing sulfonamides of formula I, wherein the variables have the designations cited in the description, by reacting m-nitro-benzoic acid chlorides of formula II with aminosulfons of formula III, under the influence of B equivalents of base IV. Said method is characterised in that, during step a) the aminosulfon of formula III is reacted with B1 equivalents of base IV, and during step b), the reaction mixture resulting from step a) is reacted with m-nitro-benzoic acid chlorides of formula II and B2 equivalents of base IV; B, B1 and B2 having the designations cited in the description.

L'invention concerne un procédé de production de sulfonamides de formule (I), dans laquelle les variables ont les significations indiquées dans la description, par réaction de chlorures de l'acide m-nitrobenzoïque de formule (II) et d'aminosulfones de formule (III), sous l'influence de B équivalents de base IV. Ce procédé se caractérise en ce que, lors de l'étape a), l'aminosulfone de formule (III) est mis en réaction avec B1 équivalents de base IV et, lors de l'étape b), le mélange réactionnel issu de l'étape a) est mis en réaction avec des chlorures de l'acide m-nitrobenzoïque de formule (II) et B2 équivalents de base IV ; B, B1 et B2 ayant les significations indiquées dans la description.

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