Synthesis, Characterization, and Evaluation of Difluoropyrido[4,3‐b]indoles as Potential Agents for Acetylcholinesterase and Antiamnesic Activity

Acetylcholinesterase (AChE) inhibitors are currently the most widely prescribed drugs for Alzheimer's disease. The high potential of indole compounds in medicinal chemistry led us to discover a novel series of fluoroindole compounds. The synthesis and pharmacological analysis of the difluoropyrido[4,3-b]indoles 11–34 are described. Compounds 11–34 were tested for AChE inhibition activity using a rat brain homogenate. Compounds 25–29 display a promising in vitro profile with an IC50 value range of 46–51.6 nM and show significant protective effect on scopolamine-induced amnesia. The present data indicate that compounds 25–29 may represent attractive potent molecules for the treatment of Alzheimer's disease.