Synthesis of Novel Hydrazide-Hydrazone Compounds and and Investigation of Their Biological Activities against AChE, BChE, and hCA I and II.

The abnormal levels of the human carbonic anhydrase isoenzymes I and II (hCA I and II) and cholinesterase enzymes, namely, acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), are linked with various disorders including Alzheimer's disease. In this study, six new nicotinic hydrazide derivatives (-) were designed and synthesized for the first time, and their inhibitory profiles against hCA I, hCA II, AChE, and BChE were investigated by assays and studies. The structures of novel molecules were elucidated by using spectroscopic techniques and elemental analysis. These molecules showed inhibitory activities against hCA I and II with IC values ranging from 7.12 to 45.12 nM. Compared to reference drug acetazolamide (AZA), compound was the most active inhibitor against hCA I and II. On the other hand, it was determined that IC values of the tested molecules ranged between 21.45 and 61.37 nM for AChE and between 18.42 and 54.74 nM for BChE. Among them, compound was the most potent inhibitor of AChE and BChE, with IC values of 21.45 and 18.42 nM, respectively. In order to better understand the mode of action of these new compounds, state-of-the-art molecular modeling techniques were also conducted.