Zonisamide intermediate and synthesis

Details Zonisamide intermediate and synthesis Zonisamide intermediate and synthesis

C - Chemistry, Metallurgy

07

D

C07D 261/20 (2006.01) C07F 1/04 (2006.01) C07F 3/00 (2006.01) C07F 3/04 (2006.01)

Patent

CA 2458905

The present invention relates to a novel sulfonation of an intermediate of zonisamide. The sulfonation processes using chlorosulfonic acid as well as acetic anhydride and sulfuric acid in an organic solvent are disclosed. Crystalline forms of benzisoxazole methane sulfonic acid (BOS-H) and its salts (BOS-Na, BOS-Ca, and BOS-Ba) and their novel preparation processes are disclosed.

L'invention concerne une nouvelle sulfonation d'un produit intermédiaire de zosinamide. Elle concerne en particulier le processus de sulfonation au moyen d'acide chlorosulfonique, ou d'anhydride acétique et d'acide sulfurique dans un solvant organique. L'invention concerne en outre des formes cristallines de l'acide benzisoxazole méthane sulfonique (BOS-H) et de ses sels (BOS-Na, BOS-Ca, et BOS-Ba) et de nouveaux procédés de préparation de ces composés.

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