A Facile Synthesis and Discovery of Highly Functionalized Tetrahydro-pyridines and Pyridines as Antimycobacterial Agents

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  • Raju Suresh Kumar
    Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University
  • Stephen Michael Rajesh
    Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University
  • Subbu Perumal
    Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University
  • Debjani Banerjee
    Medicinal Chemistry & Antimycobacterial Research Laboratory, Pharmacy Group, Birla Institute of Technology & Science-Pilani
  • Perumal Yogeeswari
    Medicinal Chemistry & Antimycobacterial Research Laboratory, Pharmacy Group, Birla Institute of Technology & Science-Pilani
  • Dharmarajan Sriram
    Medicinal Chemistry & Antimycobacterial Research Laboratory, Pharmacy Group, Birla Institute of Technology & Science-Pilani

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The four-component reaction of ethyl-3-oxo-4-(arylsulfanyl)butanoate, substituted aromatic aldehydes and ammonium acetate afforded novel ethyl 4-hydroxy-2,6-diaryl-5-(arylsulfanyl)-1,2,5,6-tetrahydro-3-pyridinecarboxylates. These tetrahydro-pyridine esters upon dehydrogenation with dichlorodicyanobenzoquinone (DDQ) afforded highly functionalized pyridines in excellent yields. These novel heterocycles were screened for their in vitro activity against Mycobacterium tuberculosis H37Rv using agar dilution method. Among the compounds screened, ethyl 2,6-di(2-bromophenyl)-4-hydroxy-5-(phenylsulfanyl)-3-pyridinecarboxylate was found to be the most active with a minimum inhibitory concentration of 1.33 μM against Mycobacterium tuberculosis and is 5.74 and 38.17 times more potent than the first line anti-tuberculosis (TB) drugs, ethambutol and pyrazinamide respectively.

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