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
Facile Synthesis of<i>N</i>‐Acylsulfonamide in the Presence of Silica Chloride (SiO<sub>2</sub>‐Cl) both under Heterogeneous and Solvent‐Free Conditions
Abstract Sulfonamides were converted to the corresponding N‐acyl sulfonamides with carboxylic acid chlorides and anhydrides in the presence of silica chloride. All reactions were performed in bothheterogeneous and solvent‐freeconditions. This method provides the N‐acyl sulfonamides products in good to high yield and purity.
Synthesis, in vitro antibacterial and carbonic anhydrase II inhibitory activities of N-acylsulfonamides using silica sulfuric acid as an efficient catalyst under both solvent-free and heterogeneous conditions
Silicasulfuricacid catalyzes efficiently the reaction of sulfonamides with both carboxylic acid anhydrides and chlorides undersolvent-free and heterogeneous conditions. All the reactions were done at room temperature and the N-acylsulfonamides were obtained with high yields and purity via an easy work-up procedure. This method is attractive and is in a close agreement with green chemistry. These
Synthesis, Characterization, and Antimicrobial Evaluation of Sulfonamides Containing <i>N</i>-Acyl Moieties Catalyzed by Bismuth(III) Salts Under Both Solvent and Solvent-Free Conditions
Efficient N-acylation of sulfonamides with both readily available carboxylic acid chlorides and anhydrides has been carried out with catalysis by bismuth(III) salts including BiCl3 and Bi (OTf)3. The reactions proceed rapidly in both heterogeneous and solvent-free conditions and afforded the corresponding N-acylsulfonamides in good to excellent yields. The mild reaction conditions and low toxicity of bismuth salts make this procedure attractive and in close agreement with the goals of green chemistry. Some of the synthesized compounds were evaluated in vitro as antimicrobial agents against representative strains of Gram-positive (Staphylococcus aureus ATCC 25922, clinical strains of Staphylococcus aureus VISA and Enterococcus spp.) and Gram-negative bacteria (Pseudomonas aeruginosa ATCC 27853, clinical strains of Klebsiella pneumonia and Escherichia coli) and as antifungal agents against Candida albicans (clinically isolated) by both disc diffusion and minimal inhibition concentration (MIC) methods. All these bacteria and fungi studied were screened against some antibiotics to compare with our chemicals' zone diameters.