Green Synthesis of Privileged Benzimidazole Scaffolds Using Active Deep Eutectic Solvent

Area of Science:

• Organic Chemistry
• Green Chemistry
• Medicinal Chemistry

Background:

• Classical synthetic methods often conflict with green chemistry principles, posing challenges in the pharmaceutical industry.
• Benzimidazoles are vital heterocyclic compounds, serving as core structures for numerous pharmacologically active molecules.
• Existing benzimidazole derivatives demonstrate significant antimicrobial, antiviral, anti-inflammatory, and analgesic properties, with established therapeutic applications.

Purpose of the Study:

• To develop a selective and sustainable synthetic route for 1,2-disubstituted and 2-substituted benzimidazoles.
• To address the need for environmentally friendly alternatives to traditional synthesis procedures in pharmaceutical development.
• To leverage deep eutectic solvents (DES) as an eco-conscious reaction medium and reagent.

Main Methods:

• A novel synthetic strategy was employed using ortho-phenylenediamine and various aldehydes as starting materials.
• Deep eutectic solvent (DES) was utilized as both the reaction medium and a reagent, eliminating the need for additional solvents.
• The reaction conditions were optimized for selectivity and sustainability.

Main Results:

• The method successfully synthesized 1,2-disubstituted or 2-substituted benzimidazoles with high yields.
• The use of DES simplified the reaction work-up procedure, enhancing overall efficiency.
• The green chemistry approach demonstrated significant advantages over conventional synthetic protocols.

Conclusions:

• The reported method offers a selective, sustainable, and efficient pathway for benzimidazole synthesis.
• Deep eutectic solvents are effective in promoting green synthetic transformations for pharmaceutically relevant compounds.
• This approach aligns with the principles of green chemistry, offering a viable alternative for the pharmaceutical industry.