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Short Paper | Regular issue | Vol 102, No. 7, 2021, pp.1402-1411
Published online, 25th May, 2021
DOI: 10.3987/COM-21-14464
■ Metal-Free Regioselective Synthesis of 2-Nitro-3-arylimidazo[1,2-a]pyridines via Oxidative Amination under Air Using Silica Sulfuric Acid as an Effective Heterogeneous Catalyst

Divya Sree Uppalapati,* Rama Sekhara Reddy Dachuru,* and Satya Veni Sunkara

*Department of Chemistry, University College of Engineering Kakinada, Jawaharlal Nehru Technological University Kakinada, Kakinada 533003, Andhra Pradesh, India

Abstract

Metal-free regioselective strategy for the synthesis of 2-nitro-3-arylimidazo[1,2-a]pyridines from β-nitrostyrene and 2-aminopyridines under aerobic conditions using silica sulfuric acid (SSA) as heterogeneous catalyst has been developed. The synthetic methodology provides the title compounds with good yields under mild conditions, and complete regioselectivity is observed. Furthermore, SSA was not used previously for this transformation.