Synthesis of some fluorine-containing pyridinealdoximes of potential use for the treatment of organophosphorus nerve-agent poisoning
摘要:
Fluoroheterocyclic aldoximes were screened as therapeutic agents for the treatment of anticholinesterase poisoning. 2-Fluoropyridine-3- and -6-aldoxime, and 3-fluoropyridine-2- and -4-aldoxime, were synthesised. Attempts to obtain 3,5,6-trifluoropyridine-2,4-bis(aldoxime) and -2-aldoxime, however, proved unsuccessful. Pentafluorobenzaldoxime was prepared by oximation of pentafluorobenzaldehyde. Acid dissociation constants (pK(a)) and second-order rate constants (k(ox)-) of the fluorinated pyridinealdoximes towards satin were measured. 2,3,5,6-Tetrafluoropyridine-4-aldoxime had the best profile: its k(ox)- approached that of the therapeutic oxime P2S (310 vs. 120 l mol(-1) min(-1)), but its higher pK(a) (9.1 vs. 7.8) fell short of the target figure of 8 required for reactivation of inhibited acetylcholinesterase in vivo. N-alkylation of the fluorinated pyridine-aldoximes may reduce their pK(a) nearer to 8 and enhance their therapeutic potential. Crown Copyright (c) 2011 Published by Elsevier B.V. All rights reserved.
Reactivation potency of fluorinated pyridinium oximes for acetylcholinesterases inhibited by paraoxon organophosphorus agent
作者:Hee Chun Jeong、Nam Sook Kang、No-Joong Park、Eul Kyun Yum、Young-Sik Jung
DOI:10.1016/j.bmcl.2008.12.070
日期:2009.2
purpose of developing new oxime reactivators of acetylcholinesterases (AChE) that have been inhibited by organophosphorus agents, emphasis was given to the finding that the lipophilic nature of fluorinated compounds is responsible for their enhanced transport across the blood brain barrier (BBB). As a result, we have designed and synthesized the fluorinatedoximederivatives, which quantum mechanical
Reactivity and mechanism of α-nucleophile scaffolds as catalytic organophosphate scavengers
作者:Pamela T. Wong、Somnath Bhattacharjee、Jayme Cannon、Shengzhuang Tang、Kelly Yang、Sierra Bowden、Victoria Varnau、Jessica J. O'Konek、Seok Ki Choi
DOI:10.1039/c9ob00503j
日期:——
Design and in vitro validation of polar α-nucleophile scaffolds that offer potent catalytic reactivity and practical utility for organophosphate decontamination.
Fluorinated pyridinium oximes as potential reactivators for acetylcholinesterases inhibited by paraoxon organophosphorus agent
作者:Hee Chun Jeong、No-Joong Park、Chong Hak Chae、Kamil Musilek、Jiri Kassa、Kamil Kuca、Young-Sik Jung
DOI:10.1016/j.bmc.2009.07.043
日期:2009.9
fluorinated oxime compounds was designed and synthesized in order to probe the effect of fluorine substitution on reactivation of inhibited acetylcholinesterase (AChE) by organophosphorus agents. Permeability measurements, using the Parallel Artificial Membrane Permeation Assays (PAMPA) method, were employed to experimentally demonstrate that membrane permeabilities of the series of oximes increase in
bis-pyridinium oximes were designed and synthesized with the aim of increasing their nucleophilicity and potential to reactivate phosphorylated human recombinant acetylcholinesterase (AChE) and human purified plasmatic butyrylcholinesterase (BChE) in relation to chlorinated and non-halogenated oxime analogues. Compared to non-halogenated oximes, halogenated oximes showed lower pKa of the oxime group (fl