Study of the acylation reaction of 2(3H)-benzothiazolones in the mixture of ZnCl2-DMF

The use of polyphosphoric acid and the complex AlCl3-DMF in 6-acylation of 2(3H)-benzothiazolones previously have been reported. Instead of the frequently used AlCl3 as a catalyst in the Friedl-Crafts reactions, we conducted the acylation of 2(3H)-benzothiazones using zinc chloride as a catalyst in DMF as solvent and acid chlorides or anhydrides as acylating agents.