Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry

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Synthesis, Characterization of Some Novel Pyrazoline incorporated Imidazo[1,2-a]pyridines for Anti-inflammatory and Anti-bacterial Activities

Author(s): Bollam Nanda Kishore, Rishika Unyala, Ameena Begum, Chirra Hepsibha, Madhava Reddy B, Harinadha Babu V

Different phenacyl bromides were reacted with 2-amino pyridine to give 2-aryl imidazo[1,2-a] pyridines, which on subsequent reaction with Vilsmeier-Haack reagent gave 2-aryl imidazo[1,2-a] pyridine carbaldehydes (4a-4b). Claisen-Schmidt condensation of 4a and 4b with different substituted acetophenones afforded chalcones (5a-5f). The reaction of chalcones with phenyl hydrazine gave six new derivatives of pyrazolyl imidazo[1,2-a]pyridines (6a-6f) in good yields. The synthesized compounds were characterised on the basis of physical and spectral data. The compounds were evaluated for anti-inflammatory and anti-bacterial activities. The compounds 6a, 6b, and 6c exhibited potent anti-inflammatory activity and results are comparable with standard drug, ibuprofen. None of the compounds showed any significant antimicrobial activity even at a concentration of 1000 μg/ml against Gram +ve and Gram –ve organisms.


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