Single step method for the production of 3-isopropyl-1H-2,1,3-benzothiadiazin-4 (3H)-one-2,2-dioxide

Single step method for the production of 3-isopropyl-1H-2,1,3-benzothiadiazin-4 (3H)-one-2,2-dioxide

A simple cost-effective process for preparing 3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide (I) which comprises reacting anthranilic isopropylamide (II) simultaneously with sulfur trioxide or chlorosulfonic acid in the presence of an organic base or with adducts of sulfur trioxide and o...

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Bibliographische Detailangaben
Hauptverfasser: BENZ, KURT, MULLER, ALBRECHT, FRETSCHNER, ERICH, MERKLE, HANS RUPERT, HANSEN, HANSPETER, WORZ, OTTO
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:A simple cost-effective process for preparing 3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide (I) which comprises reacting anthranilic isopropylamide (II) simultaneously with sulfur trioxide or chlorosulfonic acid in the presence of an organic base or with adducts of sulfur trioxide and organic bases and phosphorus oxychloride at from 50 C. to the reflux temperature, followed if appropriate, by conversion into its salts.