Sulfonylurea
Sulfonylureas (UK: sulphonylurea) are a class of organic compounds used in medicine and agriculture. They are antidiabetic drugs widely used in the management of diabetes mellitus type 2. They act by increasing insulin release from the beta cells in the pancreas. A number of sulfonylureas are also used as herbicides ("weedkiller"), because they can interfere with plant biosynthesis of certain amino acids.
Drugs in this class
First generation drugs include carbutamide, acetohexamide, chlorpropamide, and tolbutamide.
Second generation drugs include glipizide (glucotrol), gliclazide, glibenclamide, glyburide (Micronase), glibornuride, gliquidone, glisoxepide, and glyclopyramide.
Third generation drugs include glimepiride (Amaryl) (Glimiprime), Gliclazide MR (DIAMICRON MR60), although glimepiride is sometimes considered second-generation, while others classify it as third-generation.
Fourth generation (light-dependent) drugs include JB253 and JB558.
Structure
All pharmacological sulfonylureas contain a central S-arylsulfonylurea structure with a p- substituent on the phenyl ring (R) and various groups terminating the urea N′ end group (R2). Chemically, this functionality can be easily installed by reacting aryl sulfonamides (R-C6H4-SO2NH2) with isocyanates (R2-NCO).