Synthesis of combinatorial libraries based on terpenoid scaffolds

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Parasitology

Background:

• Triterpenoids like betulinic acid and ursolic acid are natural products with diverse biological activities.
• Developing novel antimalarial compounds is crucial due to increasing drug resistance.
• Combinatorial chemistry offers a powerful approach for generating diverse compound libraries.

Purpose of the Study:

• To synthesize novel triterpenoid derivatives based on betulinic acid and ursolic acid scaffolds.
• To explore the potential of these derivatives as antimalarial agents against Plasmodium falciparum.
• To identify specific structural modifications that enhance antimalarial activity.

Main Methods:

• Solid-phase organic synthesis was employed to generate combinatorial libraries.
• Two libraries of 18 derivatives each were created, focusing on diversity at C-3 and C-28 positions.
• In vitro screening against Plasmodium falciparum was conducted to assess antimalarial activity.

Main Results:

• A total of 36 novel betulinic acid and ursolic acid derivatives were synthesized.
• Four compounds exhibited a five-fold increase in antimalarial activity compared to the parent compounds.
• The C-3 and C-28 positions were identified as key sites for structural modification to enhance activity.

Conclusions:

• The synthesized triterpenoid derivatives represent promising leads for the development of new antimalarial drugs.
• Solid-phase synthesis is an effective strategy for generating diverse triterpenoid libraries for drug discovery.
• Further optimization of these compounds may lead to potent antimalarial agents.