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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
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Updated: May 25, 2026

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
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Published on: February 9, 2021

Diarylheterocycle core ring features effect in selective COX-1 inhibition.

Maria Grazia Perrone1, Paola Vitale, Paola Malerba

  • 1Dipartimento Farmaco-Chimico, Università degli Studi di Bari A. Moro via E. Orabona 4, 70125 Bari, Italy.

Chemmedchem
|January 27, 2012
PubMed
Summary

New diarylheterocycles were synthesized to investigate cyclooxygenase-1 (COX-1) inhibition. Introducing an electron-donating group on pyrazole cores restored COX-1 inhibitory activity and selectivity.

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Published on: February 7, 2019

Area of Science:

  • Medicinal Chemistry
  • Pharmacology
  • Enzyme Inhibition

Background:

  • Cyclooxygenase-1 (COX-1) is implicated in various disease pathologies.
  • Diarylheterocycles are a promising class of COX inhibitors.
  • The isoxazole ring is a common scaffold for potent and selective COX-1 inhibitors.

Purpose of the Study:

  • To explore the structure-activity relationships of diarylheterocycles targeting COX-1.
  • To identify novel heterocyclic cores that modulate COX-1 inhibitory activity and selectivity.
  • To elucidate the role of electron-donating groups in enhancing COX-1 inhibition.

Main Methods:

  • Synthesis of novel diarylheterocycles with varied heterocyclic cores (isothiazole, pyrazole).
  • Evaluation of COX-1 and COX-2 inhibitory activities in vitro.
  • Structure-activity relationship analysis, including the impact of N-aryl substituents.
  • Molecular docking studies to understand binding interactions within the COX-1 active site.

Main Results:

  • Replacement of the isoxazole core with isothiazole or pyrazole significantly reduced COX-1 inhibitory activity.
  • Introduction of an electron-donating group (methoxy) on the N-aryl pyrazole core restored COX-1 inhibitory activity and selectivity.
  • Compound 17, a pyrazole derivative with a methoxy group, selectively inhibited COX-1 (IC50 = 3.4 μM) with minimal COX-2 inhibition.
  • Molecular docking provided insights into the binding mode of the selective COX-1 inhibitor.

Conclusions:

  • The heterocyclic core significantly influences COX-1 inhibitory potency and selectivity.
  • Electron-donating groups on N-aryl pyrazoles are crucial for achieving selective COX-1 inhibition.
  • Compound 17 represents a promising lead for developing selective COX-1 inhibitors.