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Related Concept Videos

Anthelminthic Agents01:15

Anthelminthic Agents

Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
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Antifungal Agents

Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
Physical Properties of Amines01:26

Physical Properties of Amines

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Antipsychotic Drugs: Typical and Atypical Agents01:21

Antipsychotic Drugs: Typical and Atypical Agents

Antipsychotic drugs are classified into first-generation (typical) drugs including phenothiazines; and second-generation (atypical) drugs. Chlorpromazine hydrochloride (Thorazine), a phenothiazine derivative, broadly impacts the central, autonomic, and endocrine systems. This drug, along with typical agents like haloperidol (Haldol), primarily works by antagonizing D2 receptors, thus reducing dopaminergic neurotransmission. However, typical antipsychotics can cause side effects such as sedation...
Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers

Adrenergic antagonists, or sympatholytics, inhibit adrenoceptor activation driven by catecholamines or agonists. Based on their adrenoceptor specificity, adrenergic blockers can be categorized into two primary groups: α-adrenergic blockers (α-blockers) and β-adrenergic blockers (β-blockers). α-blockers interact with α1 and α2 subtypes of α-adrenoceptors.
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Ookluc: A Plasmodium berghei Line for Identifying Transmission-blocking Compounds
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2-Arylpaullones are selective antitrypanosomal agents.

Jasmin Ryczak1, Ma'ayan Papini, Annette Lader

  • 1Technische Universität Braunschweig, Institut für Medizinische und Pharmazeutische Chemie, Beethovenstraße 55, D-38106 Braunschweig, Germany.

European Journal of Medicinal Chemistry
|May 8, 2013
PubMed
Summary

Researchers developed novel paullone derivatives to combat Trypanosoma brucei rhodesiense, a parasite causing sleeping sickness. The most effective compound, 9-tert-butyl-2-(4-morpholinophenyl)paullone, showed potent antiparasitic activity with high selectivity, offering a promising avenue for new treatments.

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Published on: June 23, 2019

Area of Science:

  • Medicinal Chemistry
  • Parasitology
  • Drug Discovery

Background:

  • Antileishmanial paullone-chalcone hybrids demonstrated antiparasitic effects against Trypanosoma brucei rhodesiense.
  • However, these initial compounds exhibited low selectivity against human THP-1 cells, indicating potential toxicity.
  • Developing less toxic analogues is crucial for therapeutic applications.

Purpose of the Study:

  • To synthesize and evaluate novel paullone derivatives with improved selectivity and reduced toxicity.
  • To identify potent antileishmanial agents with potential for treating Trypanosoma brucei infections.
  • To explore the structure-activity relationship of paullone analogues substituted at the 2-position.

Main Methods:

  • Synthesis of paullone derivatives featuring acrylamide or aryl substituents at the 2-position.
  • Evaluation of antiparasitic activity against Trypanosoma brucei rhodesiense blood stream forms.
  • Assessment of cytotoxicity against human THP-1 cells to determine selectivity profiles.

Main Results:

  • Paullone derivatives with aryl substituents at the 2-position displayed potent antiparasitic activity.
  • These aryl-substituted analogues exhibited excellent selectivity profiles, significantly improving upon earlier hybrid molecules.
  • Compound 9-tert-butyl-2-(4-morpholinophenyl)paullone (3i) was identified as the most potent, inhibiting parasites at submicromolar concentrations (GI50 = 510 nM) with a selectivity index of 157.

Conclusions:

  • Novel paullone derivatives with aryl substituents represent a promising class of compounds for treating Trypanosoma brucei infections.
  • The compound 9-tert-butyl-2-(4-morpholinophenyl)paullone (3i) demonstrates significant potential as a lead candidate for developing safer and more effective antileishmanial drugs.
  • Further research into these selective paullone analogues could lead to new therapeutic strategies against neglected tropical diseases.