Pyrazole NNRTIs 3: optimisation of physicochemical properties.

Area of Science:

• Medicinal Chemistry
• Drug Discovery
• Organic Synthesis

Background:

• Novel non-nucleoside HIV reverse transcriptase inhibitors (NNRTIs) are crucial for HIV/AIDS treatment.
• Pyrazole 1 is a prototype NNRTI requiring optimization for improved therapeutic potential.
• Lipophilicity and ligand-lipophilicity efficiency (LLE) are key parameters influencing drug efficacy.

Purpose of the Study:

• To optimize the structure of pyrazole 1, a novel non-nucleoside HIV reverse transcriptase inhibitor (NNRTI) prototype.
• To enhance the potency, ligand efficiency (LE), and LLE of the NNRTI candidate.
• To explore the impact of modifying 3- and 5-substituents and the benzyl group on pyrazole 1's properties.

Main Methods:

• Systematic modification of the 3- and 5-substituents of the pyrazole core.
• Replacement of the substituted benzyl group with phenylthio and phenoxy moieties.
• Evaluation of the resulting compounds for potency, ligand efficiency (LE), and LLE.

Main Results:

• Modification of 3- and 5-substituents did not reduce lipophilicity or increase LLE.
• Replacement of the benzyl group with phenylthio or phenoxy groups led to significant improvements.
• Enhanced potency, ligand efficiency (LE), and LLE were observed with phenylthio and phenoxy analogs.

Conclusions:

• Structural modifications at the 3- and 5-positions of pyrazole 1 were not effective for optimization.
• Introduction of phenylthio or phenoxy groups represents a promising strategy for developing potent NNRTIs.
• These findings provide valuable insights for the design of next-generation HIV reverse transcriptase inhibitors.