title: An atom efficient, solvent-free, green synthesis and antimycobacterial evaluation of 2-amino-6-methyl-4-aryl-8-[(E)-arylmethylidene]-5,6,7,8-tetrahydro-4H-pyrano[3,2-c]pyridine-3-carbonitriles.
abstract: An atom efficient, green protocol for the synthesis of fifteen 2-amino-6-methyl-4-aryl-8-[(E)-arylmethylidene]-5,6,7,8-tetrahydro-4H-pyrano[3,2-c]pyridine-3-carbonitriles in quantitative yields from the reaction of 1-methyl-3,5-bis[(E)-arylmethylidene]-tetrahydro-4(1H)-pyridinones with malononitrile in presence of solid sodium ethoxide under solvent-free condition is described. The compounds were tested for their in vitro activity against Mycobacterium tuberculosis H37Rv (MTB), multi-drug resistant tuberculosis (MDR-TB), and Mycobacterium smegmatis using agar dilution method. 2-Amino-4-[4-(dimethylamino)phenyl]-8-(E)-[4-(dimethylamino)phenyl]methylidene-6-methyl-5,6,7,8-tetrahydro-4H-pyrano[3,2-c]-pyridine-3-carbonitrile was found to be the most potent compound (MIC: 0.43microM) against MTB and MDR-TB, being 100 times more active than standard, isoniazid against MDR-TB.
authors.affiliation: Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, India.
authors.forename: Raju Ranjith
authors.initials: RR
authors.lastname: Kumar
authors.forename: Subbu
authors.initials: S
authors.lastname: Perumal
authors.forename: Palaniappan
authors.initials: P
authors.lastname: Senthilkumar
authors.forename: Perumal
authors.initials: P
authors.lastname: Yogeeswari
authors.forename: Dharmarajan
authors.initials: D
authors.lastname: Sriram
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D002384:Catalysis; D004353:Drug Evaluation, Preclinical / Q000379:methods; D006801:Humans; D008826:Microbial Sensitivity Tests / Q000379:methods; D020102:Mycobacterium smegmatis / Q000187:drug effects / Q000502:physiology; D009570:Nitriles / Q000138:chemical synthesis* / Q000494:pharmacology*; D011725:Pyridines / Q000138:chemical synthesis* / Q000494:pharmacology*; D012997:Solvents
chemical_list: D000900:Anti-Bacterial Agents; D009570:Nitriles; D011725:Pyridines; D012997:Solvents