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Design and Synthesis of New Pyrazolo[1,5-c]quinazolin-5-amines as Potential TLR7/8 Modulators.

Kushvinder Kumar1, Yoshikazu Honda-Okubo2,3,4, Pradeep K Das5

  • 1Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh, India.

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Summary
This summary is machine-generated.

Researchers explored pyrazolo[1,5-c]quinazoline compounds for toll-like receptor (TLR) modulation. Initial compound 23 showed moderate TLR7/8 agonist activity, while derivatives were developed as dual TLR7/8 antagonists for potential therapeutic applications.

Keywords:
vaccine adjuvantimmune modulatorpyrazolo‐quinazolinetoll‐like receptor 7toll‐like receptor 8toll‐like receptor agonisttoll‐like receptor antagonist

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Area of Science:

  • Medicinal Chemistry
  • Immunology
  • Drug Discovery

Background:

  • Toll-like receptors (TLRs) are key immune sensors with diverse therapeutic potential.
  • TLR7 and TLR8 agonists serve as vaccine adjuvants, while antagonists are explored for autoimmune diseases and cancer.
  • Heterocyclic scaffolds are actively investigated for selective TLR modulation.

Purpose of the Study:

  • To synthesize and evaluate a novel pyrazolo[1,5-c]quinazoline scaffold for toll-like receptor 7 and 8 (TLR7/8) activity.
  • To explore structure-activity relationships (SAR) of pyrazolo[1,5-c]quinazoline derivatives at positions C1, C8, C9, and C10.
  • To identify novel TLR7/8 antagonists for potential therapeutic applications.

Main Methods:

  • Synthesis of a pyrazolo[1,5-c]quinazoline based compound (compound 23) by analogy with known TLR modulators.
  • Generation of a focused library of pyrazolo[1,5-c]quinazoline derivatives with modifications at specific positions.
  • In vitro evaluation of synthesized compounds for human TLR7 and TLR8 (hTLR7/8) agonist and antagonist activities.

Main Results:

  • Compound 23 demonstrated moderate agonist activity at both hTLR7 and hTLR8.
  • Structural modifications led to the identification of three compounds with dual hTLR7/8 antagonist activity.
  • No agonist activity was observed in the synthesized library of derivatives.

Conclusions:

  • The pyrazolo[1,5-c]quinazoline scaffold can be modulated to yield potent dual TLR7/8 antagonists.
  • These findings expand the SAR knowledge for tricyclic TLR7/8 modulators.
  • The identified antagonists represent promising leads for further drug discovery and optimization in autoimmune diseases and cancer therapy.