Procédé pour la préparation de thiazinyl trifluorométhyl sulfones substituées

摘要

The invention comprises compounds having the formula : These compounds are obtained by cyclizing compounds having the formula : wherein R8 and R9 are different and selected from the group consisting of H and -SO2 CF3. Cyclisation may be effected by heating with an acid-binding agent. An example describes the preparation of 2-trifluoromethylsulphonylphenothiazine.