Water Mediated Green and Efficient Synthesis of 2-Substituted Benzimidazole Derivatives Using Mandelic Acid as an Organo-Catalyst
- Department of Chemistry, B. N. N. College Bhiwandi, Dist-Thane-421305, India
Received: 2025-02-02
Revised: 2025-05-29
Accepted: 2025-07-18
Published in Issue 2025-12-31
Published Online: 2025-11-05

This work is licensed under a Creative Commons Attribution 4.0 International License.
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Abstract
An efficient and green protocol has been developed for the synthesis of 2-substituted benzimidazole derivatives using various aromatic aldehydes and o-phenylenediamine (OPD) in aqueous medium. In this procedure, mandelic acid is used as an inexpensive and efficient organo-catalyst for the synthesis of various derivatives of 2-substituted benzimidazole (3a-3m) in excellent yields (88-93%). The present method affords noteworthy advantages of an organo-catalyst, such as being highly stable, environmentally benign, and commercially readily available, and water as a green reaction medium, with high conversions of the products. All products have been confirmed by their spectroscopic technique, such as 1H NMR, 13C NMR, IR spectroscopy, and mass spectrometry.
Highlights
· Benzimidazole and its derivatives are important in medicinal chemistry for building blocks of various drugs due to numerous clinical applications
· An efficient and green protocol has been developed for the synthesis of 2-substituted benzimidazole derivatives under metal-free conditions
· In this methodology, mandelic acid used as organo-catalyst and water used as green reaction medium
· This novel method has many significant features such as, greener, environmentally benign and high efficiency with high conversions of the products in excellent yield
Keywords
- Benzimidazole,
- Mandelic acid,
- Organo-catalyst,
- Water,
- o-Phenylenediamine,
- Aldehydes
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