Antioxidant Activity, Acetylcholinesterase, and Carbonic Anhydrase Inhibitory Properties of Novel Ureas Derived from Phenethylamines.

A series of ureas derived from phenethylamines were synthesized and evaluated for human carbonic anhydrase (hCA) I and II, acetylcholinesterase (AChE), and butyrylcholinesterase (BChE) enzyme inhibitory activities and antioxidant properties. The ureas were synthesized from the reactions of substituted phenethylamines with N,N-dimethylcarbamoyl chloride; then, the synthesized compounds were converted to their corresponding phenolic derivatives via O-demethylation. hCA I and II were effectively inhibited by the newly synthesized compounds, with Ki values in the range of 0.307-0.432 nM for hCA I and 0.149-0.278 nM for hCA II. On the other hand, the Ki parameters of these compounds for AChE and BChE were determined in the range of 0.129-0.434 and 0.095-0.207 nM, respectively. Phenolic ureas also showed good antioxidant activities.