Method for producing sulfonamides

US8263806B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Thomas Schmidt · Neustadt, DE
• Joachim Gebhardt · Monsheim, DE
• Sandra Löhr · Ludwigshafen, DE
• Michael Keil · Freinsheim, DE
• Jan Hendrik Wevers · Zörbig, DE
• Michael Rack · Eppelheim, DE
• Guido Mayer · Neheim, DE
• Axel Pleschke

Key dates

• Filing date: Nov 23, 2006
• Grant date: Sep 11, 2012
• Expiry date: Aug 11, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C303/40
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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 characterized 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.