Synthesis, Characterization, Antitubercular and Anti-Inflammatory Activity of New Pyrazolo[3,4-d]Pyrimidines

Title:Synthesis, Characterization, Antitubercular and Anti-Inflammatory Activity of New Pyrazolo[3,4-d]Pyrimidines

Volume: 24 Issue: 8

Author(s): Ravindra Kulkarni*, Krishna Kompalli, Naveen Gaddam, Chandrashekhar Venkaraddi Mangannavar, Bikshupati Darna, Achaiah Garlapati, Dileep Kumar and Baswaraju Machha

Affiliation:

• Department Pharmaceutical Chemistry, Bharati Vidyapeeth Deemed University’s, Poona College of Pharmacy, Erandawane, Pune-411038,India

Keywords: Pyrazolo[3, 4-d]pyrimidine, anti-inflammatory, antimicrobial/ antifungal, antitubercular, synthesis, cytokines.

Abstract:

Aims and Objective: Copious proinflammatory cytokines including TNF-α and IL-1β are involved in progression of inflammation in human body. Inhibition of signaling mediated by proinflammatory cytokines offer effective in the treatment of inflammatory diseases. The treatment of dreadful infectious disease mycobacterium tuberculosis still remains a challenge owing to resistance to multiple drugs hence an urgent need for newer drugs. Pyrazolo[3,4-d]pyrimidines have been disclosed to possess numerous pharmacological activities including anti-inflammatory, antimicrobial and antitubercular activities. Here in we report the synthesis of pyrazolo[3,4-d]pyrimidines for anti-inflammatory and antitubercular activities.

Materials and Methods: The targeted compounds having pyrazolo[3,4-d]pyrimidine scaffold 8a-m were synthesized in three step reactions with the formation of key intermediate 5-amino-4-- cyno-1-phenyl pyrazole which upon cyclization resulted in 4-amino pyrazolo[3,4-d]pyrimidine for subsequent benzoylation with substituted benzoyl chlorides to form 8a-m. Antiinflammatory activity of 8a-m was assessed at 25 mg/Kg dose and minimum inhibitory concentration against gram positive, gram negative and mycobacteria was also performed. Binding interactions were also measured in binding pocket of p38 kinase.

Results: Four compounds 8a, 8b, 8e and 8i significant anti-inflammatory activity in rat paw edema model induced by carrageenan and among all 8b was potent with 80.6% activity. Numerous compounds exhibited potent activity against fungal strains than bacterial strains, compound 8k was most potent against gram negative bacteria Klebsiella pneumoniae. Compounds 8d, 8e and 8f exhibited antitubercular activity with MIC value of 6.25 μg/mL.

Conclusion: Substituted N-benzoylated amino pyrazolo[3,4-d]pyrimidines endowed significant and potent anti-inflammatory and antimicrobial activities. Molecular docking studies also revealed favorable interactions in active site of p38 kinase.

Cite this article as:

Kulkarni Ravindra *, Kompalli Krishna , Gaddam Naveen , Mangannavar Venkaraddi Chandrashekhar , Darna Bikshupati , Garlapati Achaiah , Kumar Dileep and Machha Baswaraju , Synthesis, Characterization, Antitubercular and Anti-Inflammatory Activity of New Pyrazolo[3,4-d]Pyrimidines, Combinatorial Chemistry & High Throughput Screening 2021; 24 (8) . https://dx.doi.org/10.2174/1386207323999200918114905