Patent ID: 11932613
Assignee: ADAMA AGAN LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. In a process of making mesosulfuron-methyl which comprises preparing a 1,1,3-trioxo-1,2-benzothiazole-6-carboxamide of formula (I) or a salt thereof, and providing reaction conditions for preparation of mesosulfuron-methyl as follows:, the improvement comprising preparing the 1,1,3-trioxo-1,2-benzothiazole-6-carboxamide of formula (I) or a salt thereof by:
(a) oxidizing 2,5-dimethyl-benzenesulfonamide of formula (II) or a salt thereof;, in the presence of an oxidizing agent to obtain 2-sulfamoyl-terephthalic acid of formula (III) or a salt thereof;, (b) converting the formed 2-sulfamoyl-terephthalic acid of formula (III) to obtain 2-sulfamoyl-terephthalic acid derivative of formula (IV) or a salt thereof;, , and
(c) reacting the resulting 2-sulfamoyl-terephthalic acid derivative of formula (IV) with ammonia (NH3) or ammonium containing-salt;
wherein R represents OR′ or Cl and R′ represents a branched or non-branched C1-C12 alkyl.