Sulfonamides are a diverse group of pharmaceutically important compounds 1 and 2 widely used as antibacterial, anticancer, anticonvulsant, antiinflammatory and antiviral agents and HIV protease inhibitors. Examples of recently approved drugs possessing a sulfonamide include the antihypertensive agent bosentan, 3 the antiviral HIV protease inhibitor amprenavir 4 and the phosphodiesterase-5 inhibitor sildenafil. 5 In addition, numerous sulfonamide ...