Synthesis of 7-chloro-5-trifluoromethyl/7-fluoro/7-trifluoromethyl-4H-1,4-benzothiazines as antimicrobial agents

7-Chloro-5-trifluoromethy1/7-fluoro/7-trifluoromethyl-4H-1,4-benzothiazines have been synthesized by 2-amino-5-fluoro/5-trifluoromethyl/5-chloro-3-trifluoromethyl benzenethiols condensed with beta-diketone/beta-ketoesters in the presence of DMSO involving oxidative cyclization. Pharmacological activities have also been included. (c) 2006 Elsevier Ltd. All rights reserved.