Polycondensed Heterocycles.VI. A new efficient synthesis of 4H-pyrrolo [2,1-c][1, 4] Benzothiazines

Abstract
A novel and efficient method to obtain 4H-pyrrolo [2,1-c][1,4] benzothiazine and its 4-alkyl and 4-aryl derivatives via an intramolecular nucleophilic aromatic fluoride displacement has been developed.