title: An efficient domino reaction in ionic liquid: synthesis and biological evaluation of some pyrano- and thiopyrano-fused heterocycles.
abstract: An improved domino/Knoevenagel-hetero-Diels-Alder reaction of two new aldehyde substrates; 7-olefinoxy-coumarin-8-carbaldehyde and 2-alkensulfanyl-quinoline-3-carbaldehyde, with pyrazolones was studied in ionic liquid triethylammonium acetate (TEAA), affording a series of pyrazolopyran annulated-pyrano-fused coumarins, and thiopyrano-fused quinolones. Besides acting as catalyst, since no additional catalyst used, the ionic liquid TEAA also promised its easy recovery. In all new polyheterocycles, the cis-fusion of two pyranyl rings had been inferred from 2D NMR COSY and NOESY experiments. All are good antitubercular agents, as they are found active against Mycobacterium tuberculosis H37Rv, and antibacterial agents, as they are found active against three Gram-positive (Streptococcus pneumoniae, Clostridium tetani, Bacillus subtilis) and three Gram-negative (Salmonella typhi, Vibrio cholerae, Escherichia coli) bacteria.
authors: Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Dist. Anand, 388120 Gujarat, India. njpchemdeptspu@yahoo.co.in
authors: Narsidas J
authors: NJ
authors: Parmar
authors: Rikin A
authors: RA
authors: Patel
authors: Bhagyashri D
authors: BD
authors: Parmar
authors: Navin P
authors: NP
authors: Talpada
mesh_terms: D000447:Aldehydes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D003374:Coumarins / Q000737:chemistry; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D006571:Heterocyclic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D052578:Ionic Liquids / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D009169:Mycobacterium tuberculosis / Q000187:drug effects; D011714:Pyrans / Q000737:chemistry*; D047069:Pyrazolones / Q000737:chemistry; D011804:Quinolines / Q000737:chemistry; D013329:Structure-Activity Relationship
chemical_list: D000447:Aldehydes; D000900:Anti-Bacterial Agents; D003374:Coumarins; D006571:Heterocyclic Compounds; D052578:Ionic Liquids; D011714:Pyrans; D047069:Pyrazolones; D011804:Quinolines; C037219:quinoline