C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 285/16 (2006.01)
Patent
CA 2301194
The invention relates to a method for the production of 3-isopropyl-1H-2,1,3- benzothiazine-4(3H)-one-2,2-dioxide (I) or its salt. The method is characterized in that anthranilic acid isopropylamide (II) is reacted simultaneously with sulphur trioxide or chlorosulphonic acid in the presence of an organic base, or with sulphur trioxide adducts on organic bases, and phosphoroxychloride at 50 °C until reflux temperature, and then optionally transformed into their salts.
L'invention concerne un procédé pour la préparation de 3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one-2,2-dioxyde (I) ou bien un sel de (I), caractérisé en ce que l'on fait réagir simultanément de l'isopropylamide d'acide anthranilique (II) avec du trioxyde de soufre ou bien de l'acide chlorosulfonique en présence d'une base organique ou bien avec des produits d'addition de trioxyde de soufre sur des bases organiques, et de l'oxychlorure de phosphore à 50 DEG C jusqu'à la température de reflux, et le cas échéant on les transforme en leurs sels.
Benz Kurt
Fretschner Erich
Hansen Hanspeter
Merkle Hans Rupert
Muller Albrecht
Basf Aktiengesellschaft
Robic
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