Novel Nucleophilic Compounds with Oxime Group as Reactivators of Paraoxon-Inhibited Cholinesterases

New cholinesterase reactivators are synthesized as potential antidotes for treatment of organophosphorus agent poisonings or as part of pseudo catalytic scavengers for improvement of the nerve agent prophylaxis. In this study, three novel potential cholinesterase reactivators (K064 - (E)-1-(pyridinium)-4-(2-hydroxyiminomethylpyridinium)-but-2-ene dibromide; K065 - (E)-1-(quinolinium)-4-(2-hydroxyiminomethylpyridinium)-but-2-ene dibromide; K066 - (E)-1- (isoquinolinium)-4-(2-hydroxyiminomethylpyridinium)-but-2-ene dibromide) were synthesized and tested for their po- tency to reactivate acetylcholinesterase (AChE, EC 3.1.1.3) and butyrylcholinesterase (BChE, 3.1.1.8) inhibited by pesti- cide paraoxon. As resulted, none from the synthesized compounds surpassed currently clinically used reactivators (prali- doxime, obidoxime and HI-6).