Synthesis and in vitro evaluation of bis-quaternary 2-(hydroxyimino)-N-(pyridin-3-yl)acetamide derivatives as reactivators against sarin and VX inhibited human acetylcholinesterase (hAChE)

Bioorg Med Chem. 2014 May 1;22(9):2684-91. doi: 10.1016/j.bmc.2014.03.023. Epub 2014 Mar 25.

Abstract

A series of bis-quaternary pyridinium derivatives 3a-3i of 2-(hydroxyimino)-N-(pyridin-3-yl)acetamide (2) have been synthesized. The synthesized pyridinium compounds have an amide group in conjugation to the oxime moiety. These compounds were evaluated in vitro for their reactivation efficacy against organophosphorus (OP) nerve agents (NAs) (sarin and VX) inhibited human erythrocyte ghost acetylcholinesterase (hAChE) and compared with the reactivation efficacy of 2-PAM and obidoxime. The pKa values of the synthesized compounds were found closer to the pKa values of 2- and 4-pyridinium oxime reactivators such as 2-PAM and obidoxime. Some of the compounds have shown better reactivation efficacy than 2-PAM, and obidoxime against sarin and VX inhibited AChE.

Keywords: 2-(Hydroxyimino)-N-(pyridin-3-yl)acetamide; Acetylcholinesterase; Nerve agents; Organophosphorus; Reactivators.

MeSH terms

  • Acetamides / chemical synthesis
  • Acetamides / chemistry*
  • Acetamides / metabolism
  • Acetylcholinesterase / chemistry
  • Acetylcholinesterase / metabolism*
  • Enzyme Assays
  • Humans
  • Kinetics
  • Organothiophosphorus Compounds / chemistry*
  • Organothiophosphorus Compounds / metabolism
  • Oximes / chemical synthesis
  • Oximes / chemistry
  • Oximes / metabolism
  • Protein Binding
  • Pyridines / chemistry*
  • Sarin / chemistry*
  • Sarin / metabolism

Substances

  • Acetamides
  • Organothiophosphorus Compounds
  • Oximes
  • Pyridines
  • VX
  • Sarin
  • Acetylcholinesterase
  • pyridine