PROCESS FOR PREPARING N-(2,6-DICHLORO-3-METHYLPHENYL)-5-7-DIHALO[1,2,4]TRIAZOLO[1,5A]PYRIMIDINE-2-SULFONAMIDE BY CYCLIZATION AND HALO-DEHYDROXYLATION

摘要

The invention relates to a process for making DCSA by cyclization of DCM-ATS A with an acid and phosphorous pentachloride to produce DHSA and two isomeric compounds known as HCSA. The resulting compoun ds from the cyclization are halo-dehydroxylated to produce DCSA.