sulfonamides with carboxylic acid anhydrides in the presence of Lewisacids is described. Several Lewisacids such as BF3·Et2O, ZnCl2, MoCl5, TiCl4, B(C6F5)3, Sc(OTf)3 and I2 were found to catalyze the reactionefficiently to furnish the N-acylated products in good yields undersolvent-freeconditions. The reactions of various sulfonamides were studied with different carboxylic acid anhydrides including the