Process for the preparation of 2(3h)-benzothiazolones

Details Process for the preparation of 2(3h)-benzothiazolones Process for the preparation of 2(3h)-benzothiazolones

C - Chemistry, Metallurgy

07

D

C07D 277/68 (2006.01)

Patent

CA 2122285

Abstract of the disclosure: Process for the preparation of 2(3H)-benzothiazolones The process for the preparation of 2(3H)-benzothiazolones which are optionally substituted on the benzene ring by reacting a 2-aminobenzothiazole which is optionally substituted on the benzene ring with a diazothization agent in the presence of aqueous hydrochloric acid, if appropriate with addition of a chloride, to give a diazonium chloride, reacting the diazonium chloride directly to give a 2-chlorobenzothiazole, which is optionally substituted on the benzene ring, and hydrolyz- ing the 2-chlorobenzothiazole, without intermediate isolation, at 120 - 200°C under reaction pressure.

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