title: Synthesis of new 2-substituted pyrido[2,3-d]pyrimidin-4(1H)-ones and their antibacterial activity.
abstract: 2-Substituted-5,7-dimethyl pyrido[2,3-d]pyrimidin-4(1H)-ones (8) were synthesized by oxidation of 2-substituted-5,7-dimethyl dihydropyrido[2,3-d]pyrimidin-4(1H)-ones (7) which were in turn prepared from 2-amino-4,6-dimethyl nicotinamide (5) and substituted aryl aldehydes (6). 2-Amino-4,6-dimethyl nicotinamide (5) was prepared from ethyl cyanoacetate (1) via malonamamidine hydrochloride (3). The compounds were characterized by IR, NMR, MS and elemental analyses. Compounds 7 and 8 were screened for antibacterial activity against gram positive and gram negative bacteria. Dehydrogenated compounds (8) showed less antibacterial activity than the compounds 7. Among all the test compounds screened for antibacterial activity 7c (1.25 microg/ml) showed greater activity. All the synthesized compounds were found inactive when screened for antifungal activity at the concentration of 200 microg/ml.
authors.affiliation: Department of Pharmaceutical Chemistry, University Institute of Pharmaceutical Sciences, Panjab University, Sector-14, Chandigarh 160014, India. lakshman1021@gmail.com
authors.forename: B
authors.initials: B
authors.lastname: Lakshmi Narayana
authors.forename: A Raghu
authors.initials: AR
authors.lastname: Ram Rao
authors.forename: P
authors.initials: P
authors.lastname: Shanthan Rao
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D011744:Pyrimidinones / Q000138:chemical synthesis* / Q000494:pharmacology*; D013055:Spectrophotometry, Infrared
chemical_list: D000900:Anti-Bacterial Agents; D011744:Pyrimidinones